Working time and rest breaks in the United Kingdom
Reviewed by Mellow Editorial Team, HR & payroll content team
Working time and rest breaks in the UK are governed mainly by the Working Time Regulations 1998, which set enforceable limits on hours, mandatory rest periods, and paid leave entitlements. Most workers — including agency workers and those on zero-hours contracts — are covered, though some roles have specific rules or exemptions.
Who the rules apply to
The Working Time Regulations apply to "workers" in the broad legal sense, not just employees. That means casual staff, agency workers, and most freelancers who are personally obliged to carry out work fall within scope. Genuinely self-employed contractors who run their own business and bear commercial risk are generally outside the rules.
Certain sectors have their own overlay regulations — aviation, road transport, and offshore work among them. If your workforce includes roles in those areas, check the sector-specific provisions separately.
The 48-hour average working week
The default maximum is an average of 48 hours per week, calculated over a 17-week reference period. Workers can opt out of this limit voluntarily by signing a written opt-out agreement. You cannot force anyone to sign one, and workers can cancel their opt-out by giving at least seven days' written notice (or longer if the agreement specifies, up to three months).
Keep records showing that workers who have not opted out are not exceeding the average. HMRC and the Health and Safety Executive can request evidence, and the burden is on you to demonstrate compliance.
Young workers (under 18) cannot opt out and are limited to eight hours a day and 40 hours a week.
Rest breaks during the working day
Workers aged 18 and over are entitled to:
- An uninterrupted rest break of at least 20 minutes if their working day is longer than six hours. This break must be taken during the working day, not at the start or end of it.
- Daily rest of at least 11 consecutive hours between working days.
- Weekly rest of at least 24 uninterrupted hours in each seven-day period, or 48 hours in each 14-day period.
These are floors, not recommendations. A worker on a nine-hour shift is entitled to one 20-minute break; there is no statutory entitlement to a second break unless your contracts or policies provide for one. Many employers offer more generous arrangements, and those contractual terms are enforceable once given.
Young workers have stronger protections: a 30-minute break when working more than four and a half hours, daily rest of at least 12 consecutive hours, and two days' rest per week.
Night work
Night workers — broadly, those who regularly work at least three hours between 23:00 and 06:00 — should not exceed an average of eight hours in any 24-hour period. For work involving special hazards or heavy mental or physical strain, that eight-hour limit is absolute rather than an average.
You are required to offer night workers a free health assessment before they start night work and periodically thereafter. Workers can decline, but the offer must be made. If a health professional advises that a worker is suffering health problems connected to night work, you must transfer them to day work where a suitable vacancy exists.
Annual leave
Statutory annual leave stands at 5.6 weeks per year — 28 days including bank holidays for a full-time worker on a five-day week. Part-time workers receive a pro-rata equivalent.
Leave accrues from day one of employment. Workers must take their statutory leave; you cannot pay them in lieu of it except on termination. You can specify when leave is taken by giving notice of twice the length of the leave period, but if you restrict leave during the year you must ensure workers can still take their full entitlement before the leave year ends.
Under recent case law and updated guidance, carry-over of untaken leave is permitted where a worker was genuinely unable to take it — for example, due to long-term sickness or family leave. The Employment Rights Act 2025 has also reinforced day-one rights more broadly, so staying current with your contracts and policies is worthwhile.
Record-keeping and enforcement
You are not required to record every hour worked for workers who have signed a 48-hour opt-out, but it is good practice to do so. For those who have not opted out, you need sufficient records to demonstrate the average is not being exceeded.
Workers can bring tribunal claims for rest break denials without needing to show financial loss. Enforcement action can also come from the Health and Safety Executive. The practical risk is not just legal: tired workers make more mistakes, and a culture that ignores rest entitlements tends to surface in recruitment and retention problems before it surfaces in a tribunal claim.
Where your contracts or staff handbook promise more than the statutory minimum — longer breaks, additional leave, enhanced shift patterns — those contractual terms are binding regardless of what the Regulations require.
---
Run HR and payroll in United Kingdom with Mellow
Mellow brings HR, payroll and 12 AI agents into one platform — built to handle United Kingdom properly, with payroll included, from £4 per employee per month. The AI agents don't just answer questions; they generate contracts, run cost estimates and draft letters for you.
- United Kingdom payroll software
[Start a free trial →](/register)