Shift work, night work and what the law says about hours and breaks

7 minute read · 2026-08-28

A large share of UK work happens outside office hours: wards, warehouses, factories, forecourts, kitchens, control rooms and cabs. The rules that govern it come mostly from the Working Time Regulations 1998, which apply across Great Britain, with parallel regulations in Northern Ireland. This guide sets out what those rules actually give you, in plain English, and where the exceptions sit.

The weekly limit and the opt out

You should not have to work more than an average of 48 hours a week. The word average matters: it is calculated over a reference period, normally 17 weeks, so a heavy fortnight followed by a quiet one is fine.

You can agree to work more by signing an opt out. Three points are commonly misunderstood. The opt out must be an individual written agreement, so it cannot be imposed on a whole workforce by a notice on the wall. It cannot lawfully be made a condition of getting the job. And you can cancel it, giving your employer at least seven days notice, or up to three months if your agreement specifies a longer period. An employer must not punish you for refusing to sign or for withdrawing.

Breaks and rest between shifts

Three separate entitlements apply, and people often only know about the first.

• Rest break during the shift. If you work more than six hours in a day, you are entitled to an uninterrupted break of at least 20 minutes, taken during the shift rather than at the start or the end. It does not have to be paid unless your contract says so.
• Daily rest. At least 11 uninterrupted hours between finishing one shift and starting the next.
• Weekly rest. At least 24 uninterrupted hours in each seven day period, or 48 hours in each fourteen day period.

An uninterrupted break means genuinely free of duty. Eating at your desk while answering the phone, or staying on the ward while carrying the bleep, is not a rest break. If your role makes it impossible to take breaks at the standard time, your employer may owe you compensatory rest instead, which is an equivalent period of rest taken later.

What counts as night work, and what protection comes with it

The night period is normally 11pm to 6am, and you are usually a night worker if you regularly work at least three hours of your daily working time within it. Night workers should not work more than an average of eight hours in each 24 hour period. Where the work involves special hazards or heavy physical or mental strain, the eight hour limit applies absolutely rather than as an average.

Your employer must also offer you a free health assessment before you start night work and at regular intervals afterwards. You do not have to take it up, but it is a genuine entitlement rather than a formality, and if a doctor advises that night work is causing you health problems, your employer should transfer you to day work where that is possible.

There is no statutory right to extra pay for working nights. Shift premiums, unsocial hours payments and weekend enhancements are contractual, which is why they vary so much between employers. What the law does require is that your total pay divided by your total working hours meets at least the national minimum or living wage for your age, and those rates are reset annually and published on GOV.UK. If your pay is close to the floor, a shift where you are on site but not paid can pull your average below the legal minimum.

The exceptions that catch people out

Certain groups sit outside the standard regime, wholly or partly. Drivers of goods vehicles and passenger vehicles fall under drivers' hours rules and the road transport working time rules, which are stricter in some respects and are enforced through the tachograph.

Sleep in shifts are their own category. Following litigation that reached the Supreme Court, time spent asleep on a sleep in shift is generally treated as available for work rather than working, so minimum wage is due for the periods you are awake and working, not simply for being on the premises. If you do sleep ins, read your contract carefully and check what the flat rate covers.

If the rules are not being followed

Start by raising it informally with your manager, in writing, keeping it factual: the dates, the shifts, the breaks that did not happen. If that does not resolve it, use your employer's grievance procedure, and take free advice from ACAS before you escalate, or from the Labour Relations Agency if you work in Northern Ireland.

Next step: if your current rota is not sustainable, look at what else is out there on our job listings and filter for the patterns you can actually work. Our advice section covers pay, holiday and notice periods, and if you are considering agency shifts, read our guide to permanent and temporary work.