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Scheduling laws in the United Kingdom

Any adult worker can sign away the forty-eight-hour week. Nothing they sign touches the eleven-hour daily rest, the twenty-four-hour weekly rest or the twenty-minute break, and the break is where rotas actually fail.

13 binding rules1 checked absenceSources last read 6 August 2026

How the layers work here

The Working Time Regulations apply across Great Britain and, in near-identical form, in Northern Ireland. The variation that matters is not geographic either: the weekly hours limit can be signed away by the individual worker, which no other rule here allows.

Enforcement: Split enforcement, no single agency. HSE (with local authorities, CAA, DVSA, ORR and ONR in their sectors) enforces only the regulation 28 'relevant requirements'. Rest breaks, daily rest, weekly rest and annual leave are enforced solely by the worker at an employment tribunal. The Fair Work Agency, launched 7 April 2026, is expected to take on holiday pay enforcement from 2027.

What this jurisdiction regulates

Shift scheduling in Great Britain is governed almost entirely by the Working Time Regulations 1998, which transposed the EU Working Time Directive and survived Brexit intact. The Regulations split enforcement two ways: HSE, local authorities and sector regulators enforce the health-and-safety limits listed in regulation 28 (48-hour week record duty, night work limits, health assessments, young worker limits) as criminal duties, while rest breaks, daily rest, weekly rest and annual leave are enforced by the worker through an employment tribunal claim. The rules are also unusually flexible: regulation 23(a) lets a collective or workforce agreement modify or exclude regulations 6(1) to (3) and (7), 10(1), 11(1) and (2) and 12(1) outright, and the 48-hour week can be waived by the individual worker in writing. Regulations 19, 20, 21 and 22 carve out further categories, and only the regulation 21, 22 and 23(a) carve-outs carry a compensatory rest obligation.

The famous limit is the soft one

Britain kept the forty-eight-hour average week from the Working Time Directive and attached an escape hatch nobody else in Europe has: an individual worker may waive it in writing, and the only remaining duty on the employer is to keep a list of who has. The predictable result is that schedulers treat the forty-eight-hour average as soft and infer that everything around it must be soft too. That inference is exactly backwards.

The twenty-minute break is where rotas lose. It is one break, not one per six hours, so a twelve-hour shift earns the same twenty minutes as a six-and-a-half-hour one. It has to be a single uninterrupted block, the worker has to be free to leave the workstation, and the government guidance is explicit that it belongs somewhere in the middle of the shift rather than bolted onto either end. A rota that lets somebody finish twenty minutes early instead of stopping mid-shift is non-compliant while working identical hours, which is a violation invisible to every hours total anyone will look at.

Signing the opt-out changes none of that. It buys back not one minute of the eleven consecutive hours of daily rest, the twenty-four hours of weekly rest, or the break. A worker on an opt-out still cannot be scheduled a close at eleven and an open at six the next morning, because seven hours of turnaround is seven hours whatever the weekly average happens to say.

Enforcement splits, and it splits along a line that shapes which rules get taken seriously. The Health and Safety Executive, local authorities and the sector regulators enforce only the requirements listed in regulation 28: the forty-eight-hour record duty, the night work limits, health assessments and young worker limits. Rest breaks, daily rest, weekly rest and annual leave are enforced by the worker alone, through an employment tribunal claim. The rules with the most operational bite are the ones nobody inspects.

Night work carries a second average that surprises people. Normal hours for a night worker must not exceed eight in each twenty-four, computed across a seventeen-week reference period, and that limit is a different quantity from the weekly one and is not covered by the individual opt-out. A free health assessment has to be offered before the assignment starts and at intervals afterwards.

And then the answer most people arrive here looking for. There is no maximum working temperature in Great Britain and no temperature at which work must stop. That is not a hole in this data, it is the law, and it is recorded below as a finding rather than left blank. What exists instead is a duty to assess the risk, indoors and outdoors, which binds and prescribes nothing.

The answer people arrive looking for

One British finding here is an absence, and it is the most searched question in this file. It is published as a rule in its own right because leaving the topic blank would read as a gap in the research rather than as the law.

Before the rules, the labels

Every rule below carries one of three labels, and they are not interchangeable. Blurring binding law into official guidance would push a reader either into over-complying with something advisory or into dismissing the whole page once they discovered the difference. A checked absence is the third answer, and on several of these pages it is the one people came for.

Rest and meal breaks

1 rule in United Kingdom

Rest and meal breaks

20-minute uninterrupted rest break after 6 hours

Binding law

A worker whose daily working time exceeds 6 hours is entitled to one uninterrupted rest break of at least 20 minutes, which the worker is entitled to spend away from their workstation. The break does not have to be paid unless the contract says so.

Who this covers

Every worker aged 18 or over whose daily working time is more than 6 hours. Regulation 19 does NOT exclude domestic servants in a private household from regulation 12, so they keep thisโ€ฆRead the full scope

Every worker aged 18 or over whose daily working time is more than 6 hours. Regulation 19 does NOT exclude domestic servants in a private household from regulation 12, so they keep this break. Excluded are workers whose working time is unmeasured or self-determined (reg 20, which carries no compensatory rest) and the reg 21 special cases and reg 22 shift and split-shift workers (which do carry compensatory rest under reg 24). Regulation 12(1) is also one of the provisions a collective or workforce agreement may modify or exclude outright under reg 23(a), and reg 12(2) lets such an agreement fix the break's duration and terms, so the statutory default is frequently not the operative rule. Transport workers (road, sea, air) are covered by separate sectoral regimes.

How to encode this in a schedule

Hard constraint: every assignment block whose working time exceeds 6h must contain a single contiguous non-working interval of at least 20 minutes, positioned strictly inside the block rather than at either boundary. Do not scale the break with shift length: the statutory floor stays 20 minutes at 6.5h and at 13h. Do not satisfy it with two 10-minute segments. Allow a per-employer override, because reg 23(a) permits a collective or workforce agreement to modify or exclude reg 12(1) entirely.

Break minutes
20
After hours
6
Paid
no

The mistake employers make

Three mistakes recur. First, treating the entitlement as recurring: it is one break per day, not one per 6 hours worked, so a 12-hour shift statutorily earns 20 minutes. Second, scheduling it at the start or end of the shift. GOV.UK states the employer may choose when the break falls only as long as 'the break is taken in one go somewhere in the middle of the day (not at the beginning or end)'. Third, calling a shortened shift a break: sending someone home 20 minutes early does not discharge the duty.

Why this figure does not travel

breakMinutes 20 / afterHours 6 does NOT recur: a 12-hour shift earns 20 minutes, the same as a 6.5-hour shift. California's 10-minute rest recurs every four hours and Japan's steps up at 8 hours. Recurrence is the axis on which these three jurisdictions actually differ, and it is invisible in a breakMinutes column.

Citation: Working Time Regulations 1998 (SI 1998/1833) regulation 12(1), 12(2) and 12(3); exclusions in regulations 20, 21, 22 and 23(a); compensatory rest in regulation 24

legislation.gov.uklast read 6 August 2026

Hours and overtime limits

2 rules in United Kingdom

Hours and overtime limits

48-hour average working week with individual opt-out

Binding law

A worker's working time including overtime must not exceed an average of 48 hours for each 7 days over the applicable reference period, unless the employer has first obtained the worker's agreement in writing to work more. The default reference period is 17 weeks (reg 4(3)), 26 weeks for workers excluded from certain provisions by reg 21 (reg 4(5)), and extendable to a maximum of 52 weeks by collective or workforce agreement for objective or technical reasons or reasons concerning the organisation of work (reg 23(b)).

Who this covers

Adult workers. Regulation 4(1) and (2) do not apply to domestic servants in a private household (reg 19) or to workers whose working time is unmeasured or self-determined (reg 20). GOV.UKโ€ฆRead the full scope

Adult workers. Regulation 4(1) and (2) do not apply to domestic servants in a private household (reg 19) or to workers whose working time is unmeasured or self-determined (reg 20). GOV.UK states that airline staff, workers on ships or boats, road transport workers such as delivery drivers, other staff who travel in and operate vehicles covered by drivers' hours rules, and security guards on vehicles carrying high-value goods cannot opt out. Young workers are subject instead to the stricter, non-waivable 8h/40h limit in reg 5A.

How to encode this in a schedule

Rolling-window constraint, not a per-week cap: sum working time over the trailing 17 weeks (or the agreed period) and divide by the number of weeks, and the result must be 48 or less. Annual leave, sick leave and family leave days are 'excluded days' under reg 4(7) and are backfilled from hours worked immediately after the window under the reg 4(6) formula, so they do not artificially deflate the average. Workers with a signed opt-out on file are exempt from this check but from nothing else.

Max average weekly hours
48
Reference weeks
17
Reference weeks special cases
26
Max reference weeks by agreement
52
Opt out notice days min
7
Opt out notice months max
3

The mistake employers make

Two failures. First, reading 48 hours as a weekly ceiling: a 60-hour week is lawful if the 17-week average holds. Second, believing the opt-out disapplies the working time rules generally. It disapplies regulation 4 and nothing else. Daily rest, weekly rest, the 20-minute break, the night work limit and annual leave all survive a signed opt-out. The opt-out must also be voluntary, in writing, individually held, terminable by the worker on not less than 7 days' notice (a longer notice period may be agreed but must not exceed 3 months, reg 5(2) and (3)), and the employer must keep an up-to-date record of everyone who has signed one.

Why this figure does not travel

maxAverageWeeklyHours 48 is a 17-week rolling average that any adult worker may sign away individually. It is the weakest weekly figure in this set despite being the highest number, and it is the only one with an individual opt-out.

Citation: Working Time Regulations 1998 (SI 1998/1833) regulation 4(1) to (7) and regulation 5, with the 26-week period in regulation 4(5) for regulation 21 workers and the 52-week extension in regulation 23(b); exclusions in regulations 19 and 20

legislation.gov.uklast read 6 August 2026

Hours and overtime limits

5.6 weeks paid annual leave, bank holidays may be included

Binding law

A worker is entitled to 4 weeks' annual leave in each leave year under regulation 13(1), plus 1.6 weeks' additional leave under regulation 13A(2)(e), giving 5.6 weeks in total, with the aggregate entitlement subject to a maximum of 28 days under regulation 13A(3). There is no separate statutory right to paid bank holidays: GOV.UK states that 'an employer can choose to include bank holidays as part of a worker's statutory annual leave' and that 'bank or public holidays do not have to be given as paid leave'.

Who this covers

Almost all workers, including agency workers. The aggregate statutory entitlement under regs 13 and 13A is capped at 28 days, so a 6-day-a-week worker gets 28 days rather than 33.6โ€ฆRead the full scope

Almost all workers, including agency workers. The aggregate statutory entitlement under regs 13 and 13A is capped at 28 days, so a 6-day-a-week worker gets 28 days rather than 33.6. Irregular hours workers and part-year workers are NOT on the 5.6-weeks model for leave years beginning on or after 1 April 2024: under reg 15B they accrue leave on the last day of each pay period at 12.07% of the hours worked in that period, capped at 28 days a year.

How to encode this in a schedule

Drives roster headcount rather than shift shape. Every continuously staffed post must be sized to absorb 5.6 weeks of leave per full-time employee, and because bank holidays may sit inside that allowance rather than on top of it, a UK relief-factor calculation must not add the 8 bank holidays separately unless the employer's contracts actually grant them on top. For irregular hours and part-year workers, model reg 15B accrual at 12.07% of hours worked instead of a flat 5.6 weeks.

Annual leave weeks
5.6
Base leave weeks
4
Additional leave weeks
1.6
Max statutory days
28
Irregular hours accrual percent
12.07

The mistake employers make

Modelling the UK like most of continental Europe, where public holidays are a separate statutory entitlement stacked on top of annual leave. In the UK they are not: GOV.UK confirms an employer can include bank holidays as part of statutory annual leave, and the transitional provision in regulation 26A (added with regulation 13A in 2007) exempted employers who already gave an extra '1.6 weeks or 8 days (whichever is the lesser)', which is the closest primary-source signal that the 1.6 weeks tracks the 8 bank holidays. Do not go further and assert that Parliament set 5.6 weeks in order to absorb the bank holidays: the explanatory memorandum to SI 2007/2079 states no such policy objective, and that reading is not sourceable. Double-counting bank holidays overstates required relief headcount by roughly a fifth of the leave allowance.

Why this figure does not travel

Annual leave is not an hours limit. It is filed under hours-limits because the canonical topic list has no leave value, and it has NO counterpart rule in the other five jurisdictions, none of which had leave researched. An empty cell for the other five means 'not researched', not 'no entitlement'. Render this rule outside any comparison table, or state that caveat.

Citation: Working Time Regulations 1998 (SI 1998/1833) regulation 13(1), regulation 13A(2)(e) and 13A(3), and regulation 15B for irregular hours and part-year workers

legislation.gov.uklast read 6 August 2026

Rest between shifts

2 rules in United Kingdom

Rest between shifts

11 consecutive hours daily rest

Binding law

A worker is entitled to a rest period of not less than 11 consecutive hours in each 24-hour period during which they work for their employer.

Who this covers

All adult workers. Regulation 10(1) does not apply to workers whose working time is unmeasured or self-determined (reg 20), which carries NO compensatory rest, nor to the reg 21 specialโ€ฆRead the full scope

All adult workers. Regulation 10(1) does not apply to workers whose working time is unmeasured or self-determined (reg 20), which carries NO compensatory rest, nor to the reg 21 special cases (distant workplaces, security and surveillance, continuity of service including hospitals, docks, airports, media, utilities, agriculture, urban passenger transport, foreseeable surges, accidents and exceptional events, rail) or reg 22 shift-change and split-activity workers, both of which DO carry compensatory rest under reg 24. Regulation 10(1) may also be modified or excluded outright by a collective or workforce agreement under reg 23(a), again with reg 24 compensatory rest. Regulation 19 does not exclude domestic servants from reg 10.

How to encode this in a schedule

Hard constraint: the gap between the end of one assignment and the start of the next must be at least 11 hours. Encode the reg 22 exception explicitly, since a shift worker rotating from nights to days will legitimately breach the 11-hour gap on the changeover day but then owes an equivalent block of compensatory rest. Allow a per-employer reg 23(a) override, which also triggers the reg 24 make-up obligation.

Min rest hours
11

The mistake employers make

Treating the reg 21, 22 and 23(a) exceptions as a free pass. They do not remove the rest, they defer it. Regulation 24 requires the employer to allow an equivalent period of compensatory rest wherever possible, and only where that is not possible may the employer afford such protection as is appropriate to safeguard health and safety. A rota that repeatedly clips daily rest and never books the make-up rest is non-compliant. The reg 20 exclusion is the genuine exception: it carries no compensatory rest at all, because reg 24 covers only regs 21, 22 and 23(a).

Why this figure does not travel

minRestHours 11 is the only general adult turnaround requirement in this set. It is displaceable by collective or workforce agreement under reg 23(a), but then compensatory rest is owed. Los Angeles' 10 hours is city-and-sector scoped; Japan's is an effort duty with no number; the U.S. federal, Florida and Singapore figures are null.

Citation: Working Time Regulations 1998 (SI 1998/1833) regulation 10(1), with exceptions in regulations 20, 21, 22 and 23(a) and compensatory rest under regulation 24

legislation.gov.uklast read 6 August 2026

Rest between shifts

24 hours weekly rest, or 48 hours per fortnight

Binding law

A worker is entitled to an uninterrupted rest period of not less than 24 hours in each 7-day period during which they work for their employer. If the employer so determines, the worker is instead entitled to either two uninterrupted rest periods each of not less than 24 hours in each 14-day period, or one uninterrupted rest period of not less than 48 hours in each 14-day period. Regulation 11(7) provides that the minimum rest period shall not include any part of the daily rest period to which the worker is entitled under regulation 10, except where this is justified by objective or technical reasons or reasons concerning the organisation of work.

Who this covers

All adult workers, subject to the same reg 20 (no compensatory rest), reg 21 and reg 22 exceptions as daily rest, plus modification or exclusion by collective or workforce agreement underโ€ฆRead the full scope

All adult workers, subject to the same reg 20 (no compensatory rest), reg 21 and reg 22 exceptions as daily rest, plus modification or exclusion by collective or workforce agreement under reg 23(a). Compensatory rest under reg 24 is owed for the reg 21, 22 and 23(a) routes only. The 14-day alternative is the employer's election, not the worker's.

How to encode this in a schedule

Encode 24 hours in each rolling 7-day period (or the declared 14-day alternative) as the hard constraint. Do NOT encode 35 hours as a hard constraint. Regulation 11(7) is textually additive, which on its face makes 24 + 11 = 35 hours the default clear block, but the exception for 'reasons concerning the organisation of work' is broad, GOV.UK states only the bare 24-hour figure and never mentions 35, and continuous-coverage employers routinely overlap the two periods in reliance on that exception. The defensible encoding is a hard 24-hour floor plus a configurable 35-hour preference that the employer can switch off with a recorded justification.

Min weekly rest hours
24
Min fortnightly rest hours
48
Rest reference period days
14

The mistake employers make

Overstating reg 11(7) in either direction. Asserting a flat 35-hour statutory entitlement is wrong: the enforceable floor is 24 hours, and the carve-out for objective, technical or work-organisation reasons is wide enough that most continuous-coverage rotas rely on it. Asserting that 24 hours is always automatically enough is also wrong: where no such reason exists, the weekly rest is not supposed to swallow the daily rest. Treat 35 hours as a defensible default the employer may displace with a reason, not as a number to enforce.

Why this figure does not travel

minWeeklyRestHours 24 is any 24 uninterrupted hours in a rolling 7-day period. Japan's rest day must be a full calendar day and is keyed as restDayHours; Singapore's may be a whole day or a 30-hour block for shift workers. Do not treat 24, 24 and 30 as points on one scale.

Citation: Working Time Regulations 1998 (SI 1998/1833) regulation 11(1), (2), (4), (6) and (7); exceptions in regulations 20, 21, 22 and 23(a)

legislation.gov.uklast read 6 August 2026

Night work

2 rules in United Kingdom

Night work

Night workers limited to 8 hours average per 24 hours

Binding law

A night worker's normal hours of work must not exceed an average of 8 hours for each 24 hours over the applicable reference period. Regulation 6(3) fixes that period at 17 weeks; the Regulations contain no explicit statutory cap on extending it, because reg 23(b)'s 52-week ceiling applies only to regulation 4(3) and (4). The route for changing the night-work reference period is reg 23(a), which lets a collective or workforce agreement modify or exclude regulations 6(1) to (3) altogether. GOV.UK states that the average 'is usually calculated over 17 weeks, but it can be over a longer period of up to 52 weeks if the workers and the employer agree'. Separately, a night worker whose work involves special hazards or heavy physical or mental strain must not work more than 8 hours in any 24-hour period during which the night worker performs night work. There is no individual opt-out from either limit.

Who this covers

A 'night worker' under reg 2 is a worker who, as a normal course, works at least 3 hours of daily working time during night time, or who is likely during night time to work at least suchโ€ฆRead the full scope

A 'night worker' under reg 2 is a worker who, as a normal course, works at least 3 hours of daily working time during night time, or who is likely during night time to work at least such proportion of annual working time as is specified in a collective or workforce agreement. Night time defaults to 11pm to 6am, but a relevant agreement may set any period of at least 7 hours that includes midnight to 5am. Regulation 6(1), (2) and (7) do not apply to domestic servants in a private household (reg 19), to workers whose working time is unmeasured or self-determined (reg 20, no compensatory rest), or to the reg 21 special cases (compensatory rest under reg 24). Regulation 6(1) to (3) and (7) may also be modified or excluded outright by a collective or workforce agreement under reg 23(a).

How to encode this in a schedule

Two distinct checks. The general limit is a rolling average over normal hours, so a 12-hour night rota can comply if the pattern averages out across the reference period. The special-hazards limit is an absolute per-shift cap of 8 hours with no averaging, and it bites only where the hazard is identified in a collective or workforce agreement that takes account of the specific effects and risks of night work, or in the employer's regulation 3 risk assessment. Records adequate to show compliance with regs 4(1), 5A(1), 6(1) and (7), 6A and 7(1) and (2) must be kept for 2 years under reg 9. Treat the reference period as employer-configurable rather than fixed at 17 weeks, and note that the 52-week figure is GOV.UK's statement of practice, not a number the Regulations attach to regulation 6.

Max average daily hours
8
Reference weeks
17
Max reference weeks by agreement per gov uk
52
Absolute max hours special hazards
8
Night worker threshold hours
3
Night window start time
23:00
Night window end time
06:00

The mistake employers make

Three traps. First, assuming the 48-hour opt-out also covers nights: GOV.UK states plainly that 'workers cannot opt out of the limit'. Second, citing reg 23(b) for the 52-week night-work reference period. Regulation 23(b) by its express terms substitutes the 52-week figure only into regulation 4(3) and (4); it says nothing about regulation 6(3). The night-work reference period is instead changed under reg 23(a), which permits modification or exclusion of reg 6(1) to (3) generally and carries no statutory 52-week ceiling at all. Third, forgetting that the general limit measures 'normal hours of work', so regular contractual overtime counts toward the average but genuinely occasional overtime does not, while the special-hazards limit is a hard per-shift ceiling with no averaging.

Why this figure does not travel

maxAverageDailyHours 8 is an average over 17 weeks of NORMAL hours, measured per 24-hour period, and it applies only to workers who meet the reg 2 'night worker' definition (nightWorkerThresholdHours 3). It is not a cap on the length of a night shift: a 12-hour night rota can comply. absoluteMaxHoursSpecialHazards 8 is the only per-shift cap here.

Citation: Working Time Regulations 1998 (SI 1998/1833) regulation 6(1), (3), (7) and (8); 'night worker' and 'night time' defined in regulation 2; modification route in regulation 23(a); records in regulation 9

legislation.gov.uklast read 6 August 2026

Night work

Free health assessment before and during night work

Binding law

An employer must not assign an adult worker to work that will make them a night worker unless it has ensured the worker had the opportunity of a free health assessment before taking up the assignment, or the worker had a still-valid earlier assessment. The employer must also ensure each night worker has the opportunity of a free health assessment at regular intervals of whatever duration is appropriate in their case. An assessment is free if it is at no cost to the worker. Where a registered medical practitioner advises that a worker is suffering health problems connected with night work, the employer must, where it is possible, transfer them to suitable day work.

Who this covers

Any adult worker being assigned to work that will make them a night worker, and every existing night worker. A parallel duty in reg 7(2) covers young workers assigned to work during theโ€ฆRead the full scope

Any adult worker being assigned to work that will make them a night worker, and every existing night worker. A parallel duty in reg 7(2) covers young workers assigned to work during the restricted period, except where the work is of an exceptional nature (reg 7(4)). Regulation 7(1), (2) and (6) do not apply to domestic servants in a private household (reg 19). Note that regulations 20, 21, 22 and 23(a) do NOT disapply regulation 7, so continuity-of-service employers under reg 21 still owe the assessment even though the reg 6 hours limit is lifted.

How to encode this in a schedule

Gate on assignment rather than on shift shape: a worker cannot be rostered into a pattern that makes them a night worker until the free assessment has been offered. Schedulers should hold an assessment-offered flag and date per worker and block night assignments where it is absent or stale, and hold a transfer-to-days flag that removes a worker from the night pool on medical advice. Records must be kept for 2 years under reg 9.

Record retention years
2

The mistake employers make

Treating the assessment as a hiring formality. The duty is ongoing, it must be repeated at intervals appropriate to each worker, it must cost the worker nothing, and it converts into a positive duty to move someone off nights once a doctor links their health problems to night working. It also survives the reg 21 special-case exclusions that lift the 8-hour night limit.

Citation: Working Time Regulations 1998 (SI 1998/1833) regulation 7(1), 7(2), 7(3), 7(4) and 7(6); records in regulation 9; exclusion in regulation 19

legislation.gov.uklast read 6 August 2026

Heat and outdoor work

2 rules in United Kingdom

Heat and outdoor work

No statutory maximum working temperature

No requirement

There is no maximum workplace temperature in Great Britain and no legal temperature at which work must stop. HSE states plainly that 'There is no maximum temperature for workplaces'. Regulation 7 of the Workplace (Health, Safety and Welfare) Regulations 1992 requires only that 'during working hours, the temperature in all workplaces inside buildings shall be reasonable', so it does not reach outdoor work at all. For indoor work HSE suggests minimum temperatures of at least 16C, or 13C if much of the work involves rigorous physical effort. For outdoor work HSE's position is that employers must provide protection from adverse weather, and for hot conditions HSE advises measures such as rescheduling work to cooler times of the day, more frequent rest breaks, shaded rest areas, free access to cool drinking water, and letting workers remove PPE when resting.

Who this covers

All workplaces, indoor and outdoor, across Great Britain. There is no temperature at which work must stop by law, and no separate outdoor temperature standard.

How to encode this in a schedule

Do not encode a stop-work temperature threshold, because none exists in UK law and a hard-coded number would misstate the position. The correct encoding is a soft, employer-configurable heat policy: a trigger temperature the employer chooses from its own risk assessment, which then shifts outdoor assignment blocks toward cooler parts of the day, increases break frequency, and requires shaded rest coverage. The 16C and 13C figures are indoor minimum-temperature guidance, not scheduling limits, and are suggestions rather than binding numbers.

Suggested minimum indoor C
16
Suggested minimum indoor strenuous C
13
Heat trigger basis:
none: UK law states no maximum working temperature on any measurement basis

The mistake employers make

Repeating the widely believed claim that work must stop at 30C, or 27C for strenuous work. Those numbers appear in trade union campaign material, not in law. The genuine legal position is the opposite of a bright line: no maximum exists anywhere in UK law, and the employer's obligation runs through risk assessment instead. Note also that regulation 7 of the 1992 Regulations only requires a reasonable temperature in workplaces inside buildings, so the one temperature duty that does exist in the Regulations does not apply to outdoor work.

Why this figure does not travel

heatTriggerC null means no threshold exists in law, not that heat is unregulated: the duty lives in uk-heat-outdoor-risk-assessment-duty and is criminally enforceable. This is the same shape as the two OSHA general-duty entries.

Why this label and not another

Re-typed from 'guidance' to 'none'. The rule's claim is a verified absence: no maximum working temperature exists anywhere in UK law. The 16C and 13C figures it also carries are HSE suggestions about indoor MINIMUM temperatures and are irrelevant to heat; they are retained for reference but they are not the subject of the rule. The binding heat obligation is carried separately as uk-heat-outdoor-risk-assessment-duty.

Citation: HSE guidance, Temperature in the workplace: what the law says, sitting alongside the Workplace (Health, Safety and Welfare) Regulations 1992 (SI 1992/3004) regulation 7

Health and Safety Executivelast read 6 August 2026

Heat and outdoor work

Duty to risk assess heat, indoors and outdoors

Binding law

Every employer must make a suitable and sufficient assessment of the risks to the health and safety of employees while at work, and of risks to persons not in their employment arising out of the conduct of the undertaking, and must implement the preventive and protective measures identified. The assessment must be reviewed if there is reason to suspect it is no longer valid or there has been a significant change. HSE classes heat as a hazard and states that employers must assess the risks and put controls in place. Where a young person is employed the assessment must additionally take particular account of their inexperience, immaturity and lack of awareness of risk.

Who this covers

Every employer, and every relevant self-employed person, for all work activities. The duty is not limited to indoor workplaces. Employers with five or more employees must record the significant findings and any group of employees identified as being especially at risk.

How to encode this in a schedule

Not a numeric constraint on shift shape, but the legal source of every heat control a scheduler does encode. Because the duty is outcome-based rather than threshold-based, a compliant scheduling system should let the employer configure its own heat triggers and controls (cooler-hours assignment, break frequency, rotation off hot tasks, shade and water coverage) and should record which assessment those settings derive from.

Record threshold employees
5
Heat trigger basis:
none: the duty is outcome-based and states no threshold

The mistake employers make

Concluding from the absence of a maximum temperature that there is no heat duty at all. The duty is real, criminally enforceable and not confined to indoor workplaces. What is absent is the number, not the obligation.

Why this figure does not travel

Binding but numberless, the same family as us-federal-heat-general-duty-clause and us-florida-heat-outdoor-osha-general-duty. Three of the six jurisdictions regulate heat exclusively this way.

Citation: Management of Health and Safety at Work Regulations 1999 (SI 1999/3242) regulation 3(1), 3(2), 3(3), 3(4), 3(5) and 3(6)

legislation.gov.uklast read 6 August 2026

Workers under 18

5 rules in United Kingdom

Workers under 18

Young workers: 12 hours daily rest and 48 hours weekly rest

Binding law

A young worker is entitled to a rest period of not less than 12 consecutive hours in each 24-hour period, and to a rest period of not less than 48 hours in each 7-day period. The 12-hour daily rest may be interrupted in the case of activities involving periods of work that are split up over the day or of short duration. The 48-hour weekly rest may be interrupted on the same grounds and may be reduced where justified by technical or organisation reasons, but not to less than 36 consecutive hours.

Who this covers

Workers who have attained 15 but not 18 and are above compulsory school age. Regulation 23(a) reaches only regs 10(1) and 11(1) and (2), so a collective or workforce agreement cannot bargain down the young worker figures in regs 10(2) and 11(3).

How to encode this in a schedule

Hard constraints, stricter than the adult 11 and 24 hour equivalents. Encode 36 hours as the absolute weekly-rest floor rather than the target, and require a recorded technical or organisation justification whenever a young worker's weekly rest drops below 48 hours. Where an exceptional-circumstances exception is used, GOV.UK states the compensatory rest 'can be taken just after any rest they've missed but it must be taken within the following 3 weeks'. That 3-week deadline is GOV.UK guidance rather than a figure printed in the Regulations, so treat it as the enforcement expectation, not as statutory text.

Min rest hours
12
Min weekly rest hours
48
Min weekly rest hours absolute floor
36

The mistake employers make

Running one rest engine for the whole workforce. A 17-year-old on a rota built to adult minimums breaches both the daily and the weekly rest rule while every adult on the same rota is compliant.

Also touchesRest between shifts

Citation: Working Time Regulations 1998 (SI 1998/1833) regulations 10(2), 10(3), 11(3) and 11(8); young worker force majeure exception in regulation 27

legislation.gov.uklast read 6 August 2026

Workers under 18

Young workers capped at 8 hours a day and 40 hours a week

Binding law

A young worker's working time must not exceed 8 hours a day or 40 hours a week. Where the young worker is employed by more than one employer on any day or in any week, hours are aggregated across all of them. The week starts at midnight between Sunday and Monday.

Who this covers

Workers who have attained 15 but not 18 and are above compulsory school age. No individual opt-out exists and reg 23(a) does not reach reg 5A. Regulation 5A(1) and (4) do not apply toโ€ฆRead the full scope

Workers who have attained 15 but not 18 and are above compulsory school age. No individual opt-out exists and reg 23(a) does not reach reg 5A. Regulation 5A(1) and (4) do not apply to domestic servants in a private household (reg 19). A narrow exception in reg 27A(1) disapplies reg 5A entirely where the employer requires work necessary to maintain continuity of service or production or to respond to a surge in demand, no adult worker is available, and performing the work would not adversely affect the young worker's education or training.

How to encode this in a schedule

Hard per-day and per-week caps with no averaging and no opt-out. Unlike the adult 48-hour rule there is no reference period to smooth against, so a single 9-hour shift breaches the limit on its own.

Max daily hours
8
Max weekly hours
40

The mistake employers make

Applying the adult averaging mindset. There is no reference period here: 8 hours is a daily ceiling and 40 hours is a weekly ceiling, both absolute. Employers also forget the aggregation rule, which makes the limit turn on hours the scheduler cannot see.

Why this figure does not travel

maxDailyHours 8 / maxWeeklyHours 40 are absolute with no averaging and no opt-out, and they aggregate across all of the young worker's employers. Every U.S. minors' cap in this set is per-employer.

Also touchesHours and overtime limits

Citation: Working Time Regulations 1998 (SI 1998/1833) regulation 5A(1) to (4), with the exception in regulation 27A(1) and the exclusion in regulation 19

legislation.gov.uklast read 6 August 2026

Workers under 18

Young workers barred from the restricted night period

Binding law

An employer must ensure that no young worker works during the restricted period, which regulation 2 defines as 10pm to 6am, or 11pm to 7am where the worker's contract provides for them to work after 10pm. Two different exceptions exist and they are not equivalent. Regulation 27A(3) provides that regulation 6A does not apply, 'except in so far as it prohibits work between midnight and 4 a.m.', to a young worker employed in agriculture, retail trading, postal or newspaper deliveries, a catering business, a hotel, public house, restaurant, bar or similar establishment, or a bakery, in the reg 27A(1) circumstances. Regulation 27A(2) disapplies regulation 6A for a young worker employed in a hospital or similar establishment, or in connection with cultural, artistic, sporting or advertising activities, in the same circumstances, and carries no midnight to 4am floor. Where either exception is used, the young worker must be supervised by an adult worker where such supervision is necessary for their protection, and must be allowed an equivalent period of compensatory rest.

Who this covers

Workers who have attained 15 but not 18 and are above compulsory school age. Regulation 6A does not apply to domestic servants in a private household (reg 19). Sectoral exceptions in regโ€ฆRead the full scope

Workers who have attained 15 but not 18 and are above compulsory school age. Regulation 6A does not apply to domestic servants in a private household (reg 19). Sectoral exceptions in reg 27A(2) and (3) apply only in the reg 27A(1) circumstances: the work is necessary to maintain continuity of service or production or to respond to a surge in demand, no adult worker is available, and the work would not adversely affect the young worker's education or training.

How to encode this in a schedule

Hard time-window exclusion on any worker under 18. Default block is 22:00 to 06:00, shifting to 23:00 to 07:00 only where the contract provides for work after 10pm. Encode midnight to 04:00 as a separate inner band rather than folding it into the restricted period, because for the regulation 27A(3) sectors (agriculture, retail, deliveries, catering, hospitality, bakeries) the outer band can be lifted while the inner band cannot. GOV.UK summarises the general position as staff aged 16 or 17 not being able to work between midnight and 4am.

Night window start time
22:00
Night window end time
06:00
Night window start time alt
23:00
Night window end time alt
07:00
Night window start time absolute
00:00
Night window end time absolute
04:00

The mistake employers make

Hospitality and retail employers reading their sectoral exception as a general night exemption. It is not. It lifts the 10pm to 6am ban only on the reg 27A(1) grounds, and it never lifts the midnight to 4am ban. A 17-year-old closing a bar at 1am is unlawfully rostered regardless of the exemption. The hospital and cultural/artistic/sporting/advertising exception in reg 27A(2) is genuinely wider and does reach midnight to 4am, so do not apply one exception's shape to the other.

Why this figure does not travel

Two nested windows: an outer restricted period that some sectors may lift, and an inner midnight-to-04:00 band that they may not. No other jurisdiction in this set has a two-band minors' night rule, so a single start/end pair renders the UK wrongly in either direction.

Also touchesNight work

Citation: Working Time Regulations 1998 (SI 1998/1833) regulation 6A, 'restricted period' defined in regulation 2, exceptions in regulation 27A(1), (2), (3) and (4), exclusion in regulation 19

legislation.gov.uklast read 6 August 2026

Workers under 18

Children of compulsory school age: 7am to 7pm and capped hours

Binding law

A child may not be employed before 7am or after 7pm on any day (s.18(1)(c)), nor before the close of school hours on any day on which the child is required to attend school (s.18(1)(b), subject to a byelaw allowing up to 1 hour before school), nor for more than 2 hours on any day on which the child is required to attend school (s.18(1)(d)), nor for more than 12 hours in any week in which the child is required to attend school (s.18(1)(da)), nor for more than 2 hours on any Sunday (s.18(1)(e)). On any day on which the child is not required to attend school and which is not a Sunday, the cap is 8 hours, or 5 hours if the child is under 15 (s.18(1)(g)). In any week in which the child is not required to attend school the cap is 35 hours, or 25 hours if the child is under 15 (s.18(1)(h)). No child may work more than 4 hours in any day without a rest break of 1 hour (s.18(1)(i)), and every child must have at least 2 consecutive weeks without employment during a period in the year in which they are not required to attend school (s.18(1)(j)).

Who this covers

The test is compulsory school age, not a birthday: a 16-year-old who has not yet reached the school leaving date is still a 'child' under the 1933 Act, while a 15-year-old who has passed itโ€ฆRead the full scope

The test is compulsory school age, not a birthday: a 16-year-old who has not yet reached the school leaving date is still a 'child' under the 1933 Act, while a 15-year-old who has passed it is a 'young worker' under the Working Time Regulations. England and Wales regime. Minimum working age is 14, or 13 where local authority byelaws permit specified categories of light work. Only 'light work' is allowed. Section 18(2) byelaws may impose further restrictions and may not relax the s.18(1) limits except as expressly permitted, and many authorities require an employment permit. Northern Ireland and Scotland run parallel regimes.

How to encode this in a schedule

Hard constraints keyed to a school calendar, not just to a week number: the scheduler needs to know whether each date is a school day for that child. Encode a 07:00 to 19:00 assignment window, a 1-hour break after 4 hours (twice the young worker break and three times the adult one), a 2-hour Sunday ceiling that applies in term time and in holidays alike, and an annual 2-consecutive-week blackout that must fall inside a school holiday. Model the 5/8 hour cap on the statutory trigger (a day that is not a school day and is not a Sunday) rather than on the literal word 'Saturday'.

Earliest start time
07:00
Latest end time
19:00
Max daily hours school day
2
Max daily hours sunday
2
Max weekly hours school week
12
Max daily hours non school day under 15
5
Max daily hours non school day 15 plus
8
Max weekly hours non school week under 15
25
Max weekly hours non school week 15 plus
35
Break minutes
60
After hours
4
Consecutive weeks off per year
2

The mistake employers make

Three traps. First, treating a 15-year-old as a 'young worker' under the Working Time Regulations. Until they pass compulsory school leaving age they are a child under the 1933 Act, which is far stricter: 2 hours on a school day, not 8. Second, ignoring local authority byelaws, which can lower the age floor to 13, ban particular occupations outright and require an employment permit. Third, reading GOV.UK's simplified table as the statute. GOV.UK renders s.18(1)(g) as a 'Saturdays' rule, but the statutory trigger is any day that is not a school day and is not a Sunday, which also covers weekdays in the holidays. A change is pending but NOT yet operative: section 28 of the Children's Wellbeing and Schools Act 2026 substitutes a new section 18 that moves the evening limit to 8pm, drops the separate 2-hour Sunday cap, and makes a local-authority child employment permit mandatory. legislation.gov.uk displays that substituted text as in force from 29 April 2026 'for specified purposes', but section 78(1)(a) commenced it at Royal Assent only so far as it confers or relates to a power to make regulations, and the Children's Wellbeing and Schools Act 2026 (Commencement No. 2) (England) Regulations 2026 (SI 2026/803) do not commence section 28 at all. As at 6 August 2026 the 7pm limit and the Sunday cap still stand and no permit is yet mandatory.

Why this figure does not travel

This rule covers CHILDREN OF COMPULSORY SCHOOL AGE, a different population from the 'young workers' in the other UK minors rules and from the age bands used in the U.S. files. A 15-year-old may be in either population depending on the school leaving date, so age alone does not select the rule.

Also touchesHours and overtime limitsNight work

Citation: Children and Young Persons Act 1933 section 18(1), as amended by the Children (Protection at Work) Regulations 1998 (SI 1998/276) and SI 2000/2548; byelaw power in section 18(2)

legislation.gov.uklast read 6 August 2026

Workers under 18

30-minute break for young workers after 4.5 hours

Binding law

Where a young worker's daily working time is more than 4.5 hours, they are entitled to a rest break of at least 30 minutes, consecutive if possible, and may spend it away from their workstation. Where the young worker has more than one employer on the same day, hours are aggregated across employers to test the 4.5-hour trigger.

Who this covers

'Young worker' is defined in reg 2 as a worker who has attained the age of 15 but not the age of 18 and who, as respects England and Wales, is over compulsory school age. Children still ofโ€ฆRead the full scope

'Young worker' is defined in reg 2 as a worker who has attained the age of 15 but not the age of 18 and who, as respects England and Wales, is over compulsory school age. Children still of compulsory school age fall under the Children and Young Persons Act 1933 instead. Note that reg 23(a) permits a collective or workforce agreement to modify or exclude only reg 12(1), not reg 12(4), so this break cannot be bargained away.

How to encode this in a schedule

Hard constraint on any worker under 18: blocks over 4.5h require a 30-minute non-working interval, preferably contiguous. Because the trigger aggregates across employers, a scheduler cannot rely on its own roster alone to prove compliance for a young worker holding a second job.

Break minutes
30
After hours
4.5

The mistake employers make

Applying the adult 20-minutes-after-6-hours rule to a 17-year-old. A young worker on a 5-hour shift is already entitled to 30 minutes, while an adult on the same shift is entitled to nothing.

Also touchesRest and meal breaks

Citation: Working Time Regulations 1998 (SI 1998/1833) regulation 12(4) and 12(5); 'young worker' defined in regulation 2

legislation.gov.uklast read 6 August 2026

What a scheduler encodes in the United Kingdom

Treat the opt-out as a per-worker flag that removes exactly one constraint and leaves every other one standing. The common failure is a system that reads the signature as a general waiver and stops checking rest.

Encode the twenty-minute break as a placement constraint rather than a duration one. Length is trivially satisfied. What a rota has to be able to prove is that the block is unbroken, that it sits away from the start and the end of the shift, and that the worker was genuinely released, none of which appears in an hours figure.

Daily and weekly rest are turnaround arithmetic and cheap to check: eleven consecutive hours in every twenty-four in which the worker works, and twenty-four uninterrupted hours in every seven days, or forty-eight in every fourteen where the employer so determines. Young workers need a separate parameter set entirely, with twelve hours daily and forty-eight weekly rest, an eight-hour day and forty-hour week aggregated across every employer they have, and a hard bar across the restricted night period.

What we looked for in the United Kingdom and did not publish

The most consequential entry below is a right that exists on the statute book and still cannot be stated as a number. The shift-notice regime in the 2025 Act is enacted, but its notice period is left to regulations that have not been made, so publishing a figure now would mean inventing one.

Predictive scheduling

Right to reasonable notice of shifts, right to reasonable notice of cancellation or change, and payment for cancelled, moved or curtailed shifts

Enacted but not yet operative as at 6 August 2026, and no number exists to state. Sections 1 to 4 of the Employment Rights Act 2025 (c. 36) insert a new Part 2A into the Employment Rights Act 1996 creating these rights for zero-hours and low-hours workers, but legislation.gov.uk records only 'S. 2 in force at 6.1.2026 for specified purposes by S.I. 2026/3, reg. 2(2)(b)', namely the power to make regulations and the duty to consult. The substantive notice period is defined in the Act only as a 'specified amount of time' to be set by future regulations, which have not been made. The Government's published implementation roadmap places the right to guaranteed hours and the right to reasonable notice and short-notice payments in 2027. Including a rule now would require inventing the notice period.

Predictive scheduling

Right to request a predictable working pattern under the Workers (Predictable Terms and Conditions) Act 2023

Never came into force and has been repealed. legislation.gov.uk records: 'Act repealed (6.1.2026) by Employment Rights Act 2025 (c. 36), ss. 7, 159(3); S.I. 2026/3, reg. 2(4).' It was superseded by the guaranteed-hours regime above. Any compliance tool still listing it is out of date.

Heat and outdoor work

Maximum workplace temperature or WBGT stop-work threshold

No such figure exists in UK law or in HSE guidance. HSE states 'There is no maximum temperature for workplaces'. Rather than omit the topic entirely, this absence is recorded as a rule in its own right, because it is the answer employers most often get wrong.

Rest between shifts

A hard 35-hour combined weekly rest requirement (24 hours weekly rest plus 11 hours daily rest, non-overlapping)

Downgraded rather than deleted. The additive reading follows from the text of regulation 11(7), which says the weekly rest 'shall not include any part of' the regulation 10 daily rest, but that provision carries an exception for objective or technical reasons or reasons concerning the organisation of work which is broad enough that continuous-coverage employers routinely overlap the two periods. GOV.UK states only the bare 24-hour figure and never mentions 35 hours, and no primary source states 35 as an enforceable minimum. The 24-hour floor is retained as a hard rule in uk-rest-between-shifts-weekly-rest; the 35-hour figure is now expressed there as a displaceable default rather than a constraint.

Hours and overtime limits

Sunday working opt-out for shop and betting workers

A genuine scheduling constraint under sections 36 to 43 of the Employment Rights Act 1996, since a shop worker who serves an opting-out notice cannot be required to work Sundays once the notice period expires. Omitted here because it is a contractual opt-out mechanism rather than a working time limit, it sits outside the requested topic set, and the notice mechanics were not verified against primary sources in this pass.

Hours and overtime limits

Drivers' hours rules for road transport, and the aviation, maritime and rail working time regimes

Real and binding, but each is a separate sectoral regime (assimilated Regulation (EC) 561/2006, the GB domestic drivers' hours code in Part VI of the Transport Act 1968, and the Road Transport (Working Time) Regulations 2005) with its own driving-time, break and rest architecture that does not map onto the Working Time Regulations model. Modelling them alongside the general rules would risk applying the wrong limit to the wrong worker.

Comparisons this page cannot support

These caveats bear on United Kingdom but belong to topics with no rule here, usually because the finding for that topic is that nothing exists. This reference never builds a column that ranks jurisdictions on a single number, because a hard ceiling, an averaged limit with an opt-out and a pay threshold are not the same quantity.

Scope and limits

Every figure on this page was read from the primary source linked on its rule, most recently on 6 August 2026. The methodology sets out how sources were chosen, what a checked absence means, and what happens when a rule goes stale.

Keep reading

Every jurisdiction in this reference →Heat and outdoor work across all six jurisdictions →How many people one continuously staffed post needs →Rotation patterns and the shapes that fit →

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