Changing employee shifts: how much notice must an employer give?

How much notice does an employer have to give to change a shift?

Today, the answer comes from your own paperwork and not from a statute. Work through it in this order:

1. What does the contract fix? If it states working days and hours, those are terms. Changing them needs the employee's agreement.
2. Is there a flexibility clause? Wording such as "hours may vary according to the needs of the business" lets you change shifts within its scope. Acas is clear that an employer relying on a flexibility clause may still be in breach of contract if it does not give reasonable notice of the change.
3. What have you promised elsewhere? A rota policy that says rotas are published two weeks ahead is a commitment people plan around, and tribunals look at what you said you would do.
4. What have you always done? If rotas have gone up on the first of the month for years, that pattern can itself become an expectation.

The same question from the employee's side, which is the page most of your team will find first, is how much notice for a rota or shift change?

What counts as reasonable notice?

There is no number in law, so set your own and keep to it. A standard that employers commonly adopt, and can defend, looks like this:

Whatever numbers you choose, three things make them reasonable in practice: the notice grows with the size of the change, everyone in the same role gets the same standard, and you listen when someone tells you about childcare, caring, study or a second job.

What must a shift change never break?

The Working Time Regulations 1998 apply to the rota as changed, not as planned. A last-minute swap that breaks them is unlawful whether the employee agreed or not, apart from the 48-hour limit, which an individual can opt out of in writing.

Where a rest period genuinely has to be missed in a sector that allows it, the worker is owed compensatory rest of the same length. The detail is in rest between shifts and the opt-out in the 48-hour opt-out.

What is changing in 2027?

The Employment Rights Act 2025 contains three connected rights for zero-hours and low-hours workers: a right to be offered guaranteed hours, a right to reasonable notice of shifts, and a right to payment when a shift is cancelled, moved or cut short at short notice.

None of these is in force. The government's published timeline lists them under 2027 and says the timing will be updated after consultation. No date has been set, and the figures that matter - how much notice is "reasonable", and how much is paid for a cancelled shift - are to be set in regulations that have not been made. Do not rely on any specific number you see quoted for them.

What you can do now costs little and removes most of the risk:

• Write down your notice standard and publish it with the rota.
• Log every change with the date you told the employee and the reason.
• Start recording cancelled shifts. You will need the number to cost the new payment when the rate is set.
• Find your zero-hours and low-hours workers and look at what they actually work; see guaranteed hours in 2027.

How do you change a shift pattern permanently?

A permanent change to contracted hours or days is a variation of contract. Consult the people affected, explain the business reason, consider alternatives they propose, and confirm the agreed change in writing. A change to any of the written particulars has to be notified in writing within one month of the change. If someone asks for a different pattern themselves, that is a statutory flexible working request with its own two-month deadline: see the flexible working two-month deadline.

What should a rota policy say?

• When the rota is published and where people can see it.
• The notice you aim to give for each kind of change.
• How swaps work and who approves them.
• What happens, and what is paid, when a shift is cancelled.
• Who to tell about commitments that limit availability.

Starting points: the 4-week rolling rota and the rota template.

Frequently asked questions

Sources

Checked against the primary source on 4 October 2026.

• Acas: flexibility clauses - reasonable notice when relying on a flexibility clause
• gov.uk: rest breaks at work - the 11-hour, 24-hour and 20-minute rules, and compensatory rest
• gov.uk: maximum weekly working hours - the 48-hour average and the opt-out
• gov.uk: Employment Rights Act timeline update - guaranteed hours, reasonable notice and short-notice payments listed for 2027
• Acas: Employment Rights Act 2025 - what is in force and what is still to come
• Acas: zero-hours contracts - having a clear policy on cancelling work

This is general guidance for UK employers and is not legal advice. Take advice on anything contested, unusual or expensive.