Working Time Regulations UK: Employer Guide (2026)

The Working Time Regulations 1998 (WTR) implement the EU Working Time Directive into UK law. They set limits on weekly working hours, guarantee rest breaks, and establish minimum annual leave entitlements. Even after Brexit, these regulations remain fully in force. Every UK employer needs to understand them — breaching WTR can lead to enforcement action from the HSE and claims at employment tribunal.

The 48-hour weekly limit

Under the WTR, workers must not work more than an average of 48 hours per week. This is calculated over a 17-week reference period by default. Some sectors (such as healthcare or security) may use a 26-week reference period where agreed through a collective or workforce agreement.

The 48-hour limit includes overtime but does not include time spent travelling to and from work (unless travelling is part of the job, such as a delivery driver). Paid and unpaid overtime both count towards the limit.

Opt-out agreements

Workers in the UK can voluntarily agree to work more than 48 hours per week by signing an opt-out agreement. Key rules around opt-outs:

The opt-out must be voluntary — employers cannot require it as a condition of employment or subject workers to detriment for refusing.
It must be in writing and signed by the worker.
The worker can withdraw the opt-out at any time by giving notice (the agreement can specify a notice period of up to 3 months, or 7 days if no period is stated).
Employers should keep records of who has opted out.
Even with an opt-out, employers still have a duty of care — allowing excessive hours that harm health could be negligent.

Rest breaks during the working day

Adult workers (aged 18+) are entitled to an uninterrupted rest break of at least 20 minutes if their daily working time exceeds 6 hours. The break should be taken during the shift, not at the beginning or end. Workers are entitled to spend the break away from their workstation.

There is no legal requirement to pay for rest breaks unless the employment contract says otherwise. Many employers do pay for breaks as a matter of custom or contract.

Daily rest

Workers are entitled to a minimum of 11 consecutive hours of rest in each 24-hour period. For example, if a worker finishes at 10pm, they should not start again until 9am the next day.

Weekly rest

Workers are entitled to either:

24 hours of uninterrupted rest in each 7-day period, or
48 hours of uninterrupted rest in each 14-day period.

Employers can choose which pattern to apply. In practice, most workers get at least one full day off per week.

Night work limits

Night workers (those who regularly work at least 3 hours during the night period, typically 11pm to 6am) must not work more than an average of 8 hours in each 24-hour period, calculated over a 17-week reference period.

If the night work involves special hazards or heavy physical or mental strain, the 8-hour limit is absolute — not an average. Employers must also offer night workers a free health assessment before they start and at regular intervals afterwards.

Record keeping obligations

Employers must keep adequate records to demonstrate compliance with the WTR. This includes:

Records showing that workers are not exceeding the 48-hour weekly limit (or have signed opt-outs).
Records of night workers' hours.
Evidence that health assessments have been offered to night workers.
Records must be kept for 2 years.

The regulations do not specify the format of records, but they must be sufficient for the HSE or a tribunal to verify compliance if challenged.

Annual leave under the WTR

The Working Time Regulations also establish the statutory minimum for annual leave. All workers are entitled to 5.6 weeks of paid annual leave per year (28 days for a full-time worker on a 5-day week). This can include public bank holidays.

Leave begins accruing from day one of employment. Part-time workers receive the same 5.6 weeks but pro-rated to their working pattern. For detailed guidance on calculating entitlements, see our annual leave entitlement guide.

Young workers (16-17 year olds)

Young workers have enhanced protections under the WTR:

Maximum 8 hours per day and 40 hours per week — with no opt-out available.
30-minute rest break if working more than 4.5 hours (compared to 20 minutes after 6 hours for adults).
12 hours daily rest (compared to 11 for adults).
48 hours weekly rest — they must have 2 consecutive days off per week.
Young workers should generally not work between 10pm and 6am (or 11pm and 7am in some sectors).

Enforcement

The Health and Safety Executive (HSE) enforces the limits on working hours, night work, and health assessments. Employers who fail to comply can face enforcement notices and, in serious cases, prosecution.

Workers can bring claims to an employment tribunal if they are denied rest breaks or annual leave, or if they suffer detriment for refusing to exceed the 48-hour limit. Claims must generally be brought within 3 months of the alleged breach.

How Leavely helps with WTR compliance

Leavely makes it straightforward to stay compliant with the Working Time Regulations:

Annual leave tracking — automatically calculates statutory entitlements, handles pro-rata for part-timers, and prevents over-booking.
TOIL and overtime visibility — if you offer time off in lieu, Leavely tracks accrued hours alongside leave balances so you can spot when workers are approaching limits.
Absence calendar — team-wide view of leave and working patterns helps managers identify rest break compliance issues.
Full audit trail — every leave request, approval, and balance change is logged for 2+ years, giving you the records you need if challenged.