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Quick answer

Start planning summer cover by February or March: set a capacity limit (maximum people off at once per team), decide your request method (first-come-first-served or a batch deadline), and communicate both before requests start arriving. You can refuse a request for a genuine business reason, but you cannot refuse so often that a worker cannot take their full 5.6 weeks' statutory entitlement within the leave year.

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Part of the staff holiday management system
This guide sits alongside the wider staff holiday management guide, which covers the full system from requests and approvals to records and software. For a deeper look at what to do when two requests clash, see the companion guide on handling holiday clashes at work.

Why summer leave is harder to manage

For most UK small businesses, the summer months concentrate annual leave demand into a short window. Several forces arrive at the same time:

None of these pressures is unusual or unfixable. They become a problem when there is no plan, no policy and no conversation with the team before the requests arrive. The rest of this guide sets out how to build that plan.

Setting your capacity limit

The single most important decision in summer leave planning is also the simplest: how many people can be off at the same time in each team? Getting this number written down and communicated before requests arrive makes almost everything else easier.

A few worked examples to illustrate how to approach it:

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Five-person team
Minimum cover needed: three. Max absent at once:
2 people
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Ten-person team
Minimum cover needed: six. Max absent at once:
4 people
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Three-person team
Minimum cover needed: two. Max absent at once:
1 person
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Specialist role
Only one person trained. Max absent at once:
0 without cover

To work out your defensible limit for each team or department:

List the must-cover functions
For each team, what tasks or roles must be available every working day during summer? This is your minimum cover. Be honest: can one person realistically cover all of it, or do you need two?
Subtract minimum cover from headcount
If the team has seven people and minimum cover is four, the maximum off at once is three. Write this number down. It is your standard summer limit.
Check for skills, not just numbers
Two people off is fine if the remaining five can cover all duties. If one role has only one trained person, that person needs their own rule: they may not be able to take leave in peak weeks without a plan for cover.
Set a tighter limit for peak weeks if needed
If July and August are busier than the rest of summer, the limit for those six weeks might be one person off instead of two. Publish this as a seasonal adjustment alongside the standard rule.
Write it down and share it before requests open
The limit only works if everyone knows it before they book their holiday. Add it to your leave policy, share it in a team meeting, and make sure it is visible in your leave management system.
No more counting in your head
Capacity limits enforced automatically

Book Time Off lets you set a maximum number of people who can be off at once in each department. When an employee submits a request that would breach the limit, it is flagged before anyone approves it, so the manager never has to count how many people are already off on those dates. The wallchart shows existing approved leave for any week at a glance.

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Choosing your summer request method

Once you know your capacity limit, you need a rule for what happens when more requests arrive than you can grant. There are four main approaches:

First-come-first-served

The most common method: the first request that arrives within the capacity limit is granted; later requests for the same dates are refused or offered alternatives. It is straightforward and easy to defend if applied consistently. The drawback for summer is that it heavily rewards people who can plan furthest ahead. Parents whose children's school only announces term dates in February are at a disadvantage compared with employees who book in January.

Batch deadline

Set a single submission deadline for all summer requests (say, 31 March for all leave from 1 July to 31 August). Every request received by the deadline is treated as a simultaneous batch, rather than a race to submit. Where requests exceed capacity, you then apply your tie-break rule (rotation from last year, longest-serving employee priority, or a random draw). Requests received after the deadline revert to first-come-first-served for whatever capacity remains. This is the fairest approach for summer and reduces the frantic early-morning email race.

Rotation

For teams where everyone wants the same two weeks (the last week of school term, for instance), a rotation by year is clean and easy to explain. Whoever had the prime week last year goes to the back of the queue this year. Keep a log so the rotation is visible. The weakness is that it requires a record going back several years and does not handle new starters easily.

Hybrid

Many businesses run a batch deadline for their two or three peak weeks (the weeks immediately after school breaks up and before it returns) and revert to first-come-first-served for the rest of the summer. This reduces the planning burden without abandoning the fairness benefits of batch allocation for the most contested dates.

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Decide the method before you communicate it
Whatever approach you choose, the critical thing is that it is written down and shared before requests open. Announcing a new rule after a contested request has arrived looks retrospective and is much harder to defend. If you are changing the method from last year, communicate the change early in the year with enough lead time for staff to plan.

The framework for taking and refusing leave comes from regulation 15 of the Working Time Regulations 1998. The three rules that matter most for summer planning are:

Rule Who gives notice Minimum notice required
Worker requests leave Employee At least twice the leave length (calendar days)
Employer refuses leave Employer (counter-notice) At least equal to the leave length (calendar days)
Employer requires leave on set dates (e.g. shutdown) Employer At least twice the leave length (calendar days)

In practice: a one-week holiday request (five working days) requires the employee to give at least 10 calendar days' notice. If you want to refuse it, you must give counter-notice at least five calendar days before the leave was due to start. ACAS and GOV.UK both confirm this framework on their guidance pages linked in the sources below.

Many employers extend the notice requirement contractually. Setting a four-week or six-week minimum notice period for any leave over five days is entirely lawful, gives you more planning time, and is standard in industries such as hospitality, retail and healthcare. If you set a longer notice period, put it in writing and apply it to everyone.

The statutory floor you must protect. You can refuse individual requests, but the Working Time Regulations are explicit: you cannot refuse so often that a worker is unable to take their full 5.6 weeks statutory holiday (28 days for a five-day-a-week worker) within the leave year. If you have refused several summer requests and a worker is approaching year-end with a significant unused balance, you must grant leave in sufficient time for them to use it. Failing to do so exposes you to an Employment Tribunal claim for unlawful refusal of statutory leave. For more on what happens to untaken leave, see the guide to annual leave carry forward rules.

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Contractual notice does not override the statutory floor
You can extend the employee's notice requirement beyond the statutory default of "twice the leave", but you cannot use procedural rules (for example, "we never accept requests less than eight weeks in advance") to block a worker from taking their statutory 5.6 weeks altogether. If your notice window makes statutory leave impossible to take, the procedural rule bends, not the entitlement.

School holidays, fairness and the discrimination risk

Summer leave refusals create two specific legal risks that do not apply as sharply at other times of year. Both stem from the Equality Act 2010.

Indirect sex discrimination and caring responsibilities

The school summer holidays are a fixed, unavoidable constraint for employees with children. Employees who need leave during those weeks are disproportionately likely to be women, because women still carry the majority of childcare responsibilities in the UK. A policy that consistently refuses school-holiday requests, or a first-come-first-served system that systematically disadvantages people who cannot plan months ahead because of unpredictable school announcements, can amount to indirect sex discrimination under section 19 of the Equality Act 2010.

This does not mean you must grant every school-holiday request. It means that when you refuse one, you need to be able to show:

Religion or belief

Some employees may observe religious festivals that fall in the summer months. Refusing leave for a religious festival can be indirect religion or belief discrimination under the Equality Act 2010 unless the refusal is a proportionate means of achieving a legitimate business aim. Document your reasoning and explore alternatives before declining.

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Keep a simple record of every refusal and why
You do not need an elaborate system. A note of the date, the dates requested, the reason for refusal, and what alternatives were offered is enough. This record protects you if a refusal is challenged months later. The holiday request form template includes a manager decision section you can use as the basis for this record.
Objective records, automatically
First-come-first-served, kept honest

When requests arrive via Book Time Off, they are timestamped in the order they land, so first-come-first-served is objective rather than based on a manager's memory or an inbox that sorts by sender. Every request and decision is logged, and the wallchart shows the whole team's approved leave for any summer week at a glance before an approval decision is made.

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Communicating the plan before requests arrive

The point of a summer cover plan is that it prevents contested situations from arising, not that it resolves them once they do. That only works if the plan is communicated to the whole team before the first summer request lands.

What to communicate, and when:

For small businesses without a formal HR function, a short email in January or February, followed by a five-minute mention at a team meeting, is usually enough. The important thing is that it happens consistently every year so that "this is how we always do summer leave" becomes established common knowledge rather than a new surprise each June.

Your summer planning timeline

Working backwards from a July start of the school holidays, here is a practical timeline:

January: review last year
Did cover break down anywhere? Were any requests refused that caused resentment? Did anyone end the year with unused leave from refused summer requests? Use this review to adjust the capacity limit or request method for the coming year.
February: update the policy and communicate it
Send the summer leave rules to the whole team. State the capacity limit, the request method, any peak-period restrictions, and the deadline for summer requests. Do this before anyone starts planning their holidays, so no one can say they were not warned.
March to April: open the request window
If you are using a batch deadline, all requests received by the deadline (say, 31 March) are processed together. If using first-come-first-served, process requests in the order they arrive. Confirm decisions in writing promptly and offer alternative dates where a request cannot be granted.
May: confirm cover and identify gaps
Plot approved summer leave on a calendar or wallchart and check for weeks where cover looks thin. If a gap is emerging in July or August, now is the time to act: arrange temporary cover, ask for volunteers to shift dates, or plan how the business will operate with reduced capacity.
June onwards: monitor and manage
Keep an eye on the overall balance of leave taken versus leave remaining for each team member. If someone has used very little leave by late June, encourage them to book before the summer ends. If a team member has had multiple summer requests refused and still has a large unused balance, plan how they can take it before the leave year closes.
September: review and document for next year
Note anything that went well and anything that did not. Update the leave policy if the capacity limit or request method needs changing. A one-page note filed at the end of every summer becomes an invaluable record when January comes around again.
From the plan to the practice
Approvals in one click, records kept automatically

When an employee requests summer leave in Book Time Off, their approver gets an email and can approve or decline in one click without opening the app. The remaining balance updates, the booking appears on the shared calendar and wallchart, and everyone is notified. The record of every request, decision and outstanding balance is always there when you need it, without any filing.

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What to do when cover falls short

Even with good planning, some summers produce a cover shortfall: the person you were relying on calls in sick, or a cluster of requests you did not anticipate arrives late. The options, roughly in order from least to most disruptive:

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Cancelling approved leave is the high-risk option
The notice rule for cancellation is the same as for refusal: counter-notice at least equal in length to the leave. Cancelling after the employee has booked flights or accommodation can lead to a claim for loss or, in extreme cases, contribute to a constructive dismissal argument. Reserve it for genuine emergencies and document the reason clearly.

Sample summer leave policy clause

The following clause can be adapted for a staff handbook, company leave policy, or standalone summer leave note. Customise the numbers and dates to match your business. For the wider leave policy framework (statutory minimums, carry-forward, accrual rules), see our guide to writing a UK leave policy.

Sample clause

1. Summer request window. Annual leave requests for the period 1 July to 31 August must be submitted by [31 March / your chosen date]. Requests received by this deadline will be considered as a single batch. Requests received after this deadline will be processed on a first-come-first-served basis subject to remaining capacity.

2. Capacity limits. During the summer period, a maximum of [X] members of each team may be on annual leave at the same time. For the weeks commencing [peak dates, e.g. 28 July and 4 August], the limit is [Y]. These limits are set to ensure [minimum function] remains covered.

3. Tie-break rule. Where requests received within the deadline exceed capacity, preference will be given by [rotation based on the previous year / seniority / a draw among equally-placed requests]. The tie-break rule applies consistently to all team members. Requests declined by the tie-break will be offered the next available slots.

4. Refusal and alternatives. Where a summer request cannot be granted, the manager will give a written reason and offer alternative dates. We will consider requests for flexible working arrangements, swapped days with a colleague, or split leave as alternatives to outright refusal.

5. Ensuring entitlement is taken. Every team member must be able to take their full statutory annual leave entitlement within the leave year. Where summer refusals mean a significant balance remains in September, managers will work with each team member to schedule the remaining leave before the year-end.

Sources

Primary sources cited in this guide

legislation.gov.uk Working Time Regulations 1998, regulation 15 (notice for taking and refusing leave)
GOV.UK Holiday entitlement: overview and statutory minimum
GOV.UK Holiday entitlement: booking time off
ACAS Asking for and taking holiday
ACAS Checking holiday entitlement
legislation.gov.uk Equality Act 2010, section 19 (indirect discrimination)
legislation.gov.uk Equality Act 2010 (full text)
nidirect Taking your holidays (Northern Ireland)

FAQs

How far in advance should staff request summer leave?
The statutory minimum under regulation 15 of the Working Time Regulations 1998 is notice at least twice as long as the leave requested, so a one-week holiday requires ten calendar days' notice. Most small businesses find this too short for summer planning and set a longer contractual rule, such as four weeks for any leave over five days, or a single early-spring submission deadline for all summer requests. Whatever you set, put it in writing and apply it consistently.
Can I refuse summer leave requests during school holidays?
Yes, for a genuine business reason, but you must be careful about indirect discrimination. Blanket refusals during school holiday periods can amount to indirect sex discrimination under the Equality Act 2010, because employees with caring responsibilities for children are statistically more likely to be women and disproportionately affected. Before refusing, document the business reason, explore alternatives such as swaps or flexible arrangements, and check whether the same people are repeatedly refused. An employee must still be able to take their full 5.6 weeks' statutory entitlement within the leave year.
Can I impose a blackout on annual leave during peak summer months?
Yes. Under regulation 15 of the Working Time Regulations 1998, an employer can use counter-notice to refuse leave for a business reason, including a blanket restriction on a period such as peak trading months. You need to apply this consistently, communicate it clearly before requests are submitted, and make sure employees can still take their full statutory 5.6 weeks' entitlement at other times of the year. A blanket school-holiday blackout that disproportionately affects employees with children could still be challenged as indirect sex discrimination unless it is a proportionate means of meeting a legitimate aim.
Is first-come-first-served fair for summer leave requests?
First-come-first-served is the most common method and is generally defensible when applied consistently, but it can disadvantage employees who cannot plan as far ahead, including parents tied to school holiday announcements, shift workers, and employees whose religious observances are confirmed late in the year. Many employers combine first-come-first-served with a batch deadline for high-demand weeks, so that all requests submitted by a set date are treated equally rather than rewarding whoever sends the email first.
What notice does an employer have to give to refuse a summer leave request?
Under regulation 15(4) of the Working Time Regulations 1998, the employer's counter-notice must be given at least the same number of calendar days in advance as the length of the leave requested. So a five-day request must be refused at least five calendar days before the leave was due to start, and a ten-day request at least ten calendar days before. If the employment contract sets a longer refusal notice period, the contractual rule applies. Refusing after that deadline generally means the worker is entitled to take the leave.
About this guide

Written by the Book Time Off editorial team. We build leave management software for UK SMEs and write practical guides on UK employment law, holiday entitlement, and HR best practice. All content is reviewed against current GOV.UK and ACAS guidance and updated as the rules change.

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This is not legal advice
This guide explains the general legal framework for summer leave management. It is not a substitute for specific legal advice on your situation. If you are dealing with a contested refusal, a discrimination concern, or a tribunal claim, take advice from an employment lawyer or contact the ACAS helpline.