UK Zero-Hours Contract Rights and Pitfalls

Zero-hours contracts (ZHCs) in the UK are arrangements under which the worker is engaged but with no guaranteed minimum hours of work. The employer offers work as needed; the worker is free to accept or decline. The structure provides flexibility to both parties but creates income uncertainty for the worker.

This guide covers the legal framework, the statutory rights that apply to ZHC workers, the prohibition on exclusivity clauses, and the recent introduction of rights to request predictable terms under the Workers (Predictable Terms and Conditions) Act 2023.

How zero-hours contracts work

The ZHC arrangement: the employer engages the worker under a contract but with no commitment to offer any specific hours. The worker is on a list of available workers; the employer calls or messages when work is available; the worker accepts or declines. Payment is for actual hours worked.

Common sectors using ZHCs: hospitality (waiting, kitchen, bar staff), care (home care visits, residential care relief), retail (event staffing, peak coverage), agriculture (seasonal picking), warehousing (peak season cover). The flexibility suits employers managing variable demand and workers wanting flexibility.

Status: most ZHC workers are 'workers' under section 230 ERA 1996 rather than 'employees'. Worker status gives statutory rights to minimum wage, paid holiday, sick pay (subject to earnings), pension auto-enrolment (subject to earnings), anti-discrimination, working time protections - but not the full set of employee rights including unfair dismissal protection.

Edge case: some ZHCs are structured as employment contracts giving 'employee' status with the full employee rights set. Whether the contract is worker or employee depends on the factual relationship, not just the contract wording. Mutuality of obligation between engagements is a key factor.

The ban on exclusivity clauses

Section 27A ERA 1996, inserted by the Small Business, Enterprise and Employment Act 2015, prohibits exclusivity clauses in ZHCs. An exclusivity clause is one that prevents the worker from working for another employer or requires permission to do so. Such clauses in ZHCs are unenforceable.

The protection extends to anti-detriment provisions: a worker who works for another employer cannot be subject to detriment (no further work offered, reduction in hours, dismissal) for the act of working elsewhere. The Exclusivity Terms in Zero Hours Contracts (Redress) Regulations 2015 provide the enforcement mechanism.

In practice, the protection has reduced visible exclusivity clauses in ZHCs. Some employers have used softer forms of pressure (preferential offer of work to 'loyal' workers, informal discouragement of multiple employments) that fall short of legal exclusivity but produce similar effect.

Worked example: a hospitality ZHC worker also takes shifts at another restaurant. The original employer's ZHC contains a clause requiring exclusivity. The clause is unenforceable; the worker can work both jobs. If the original employer reduces hours offered because of the second job, that may be detriment under the 2015 Regulations.

Right to predictable terms (2024)

The Workers (Predictable Terms and Conditions) Act 2023 introduced a right for workers (and agency workers) with unpredictable work patterns to request more predictable working terms. The right came into force in September 2024.

The request can cover the number of hours, the days and times of work, and the period of engagement. Workers must have been with the employer for at least 26 weeks before they can make a request. The employer must consider the request and respond within 1 month, with refusal only on specified business grounds.

The grounds for refusal: extra costs, ability to meet customer demand, ability to reorganise work among existing staff, ability to recruit additional staff, detrimental impact on quality, detrimental impact on performance, insufficiency of work during proposed periods, planned structural changes.

Practical action: ZHC workers wanting more stable hours can use the new right after 26 weeks of engagement. The request must be in writing, specifying the desired pattern. Most employers will engage constructively with reasonable requests; outright refusal requires one of the specified grounds and may be challengeable.

Statutory rights for ZHC workers

National Minimum Wage / National Living Wage apply to ZHC workers under the National Minimum Wage Act 1998. The rates for 2024/25: GBP 11.44/hour for age 21+, GBP 8.60 for 18-20, GBP 6.40 for 16-17 and apprentices. Workers under 21 progress to the full NLW rate at age 21 from April 2024 (previously age 23).

Holiday: 5.6 weeks of paid holiday per year. For irregular-hours workers, the Harpur Trust v Brazel decision established the full 5.6 weeks regardless of weeks worked (not pro-rated to working weeks). The Employment Rights (Amendment, Revocation and Transitional Provision) Regulations 2023 introduced 'rolled-up holiday pay' for irregular workers from April 2024 as an alternative.

Statutory Sick Pay: ZHC workers earning above the LEL (GBP 123/week, 2024/25) qualify for SSP after 4 consecutive days of incapacity. The qualifying days are based on the worker's normal working pattern; for very irregular workers, the qualifying days assessment can be complex.

Pension auto-enrolment: ZHC workers earning above the GBP 10,000 trigger (annualised) are auto-enrolled. For workers with fluctuating monthly pay, the calculation is done on each pay period - some months may meet the trigger, others may not. The employer assesses each pay period.

Pros and cons for the worker

Pros: flexibility to accept or decline work, ability to work for multiple employers, no commitment to specific hours that may not suit, useful for students or those with other commitments, sometimes higher hourly rates to compensate for the irregularity.

Cons: income uncertainty, no guaranteed minimum hours making budgeting difficult, often pressure (even where no exclusivity) to accept all offered work, harder to qualify for mortgages or large loans without stable income evidence, harder to plan major life events around fluctuating income.

For some workers (students, semi-retired, those with caring responsibilities) the flexibility outweighs the income uncertainty. For others (those needing predictable household income, those building credit history, those wanting career progression) ZHCs are less suitable as long-term arrangements.

Practical action: ZHC workers wanting to move to stable employment can use the new predictable terms right after 26 weeks, or seek alternative employment. Many ZHC engagements act as a stepping stone to permanent positions once the worker demonstrates reliability and the employer has predictable work to offer.

Continuity of service across engagement gaps

Continuity of service for employment rights (unfair dismissal qualifying period, statutory redundancy pay) typically requires continuous employment with the same employer. Gaps in employment can break continuity, resetting the qualifying clock.

For ZHC workers with regular but intermittent engagements, the position depends on whether there is an 'umbrella contract' covering the gaps. Where the worker is on a 'list' and offered work as available, with no contractual obligation during gaps, the gaps typically break continuity. Each engagement may be a separate period.

However, case law has recognised continuity where there is regular pattern of engagements with mutual expectation. The Pulse Healthcare Ltd v Carewatch case and subsequent decisions have applied this principle to specific scenarios.

Practical action: ZHC workers wanting to build continuity for employment rights should keep records of all engagements with dates and hours. Where continuity is disputed at tribunal, the records support the case for an overarching employment relationship versus separate discrete engagements.

Frequently asked questions

Are zero-hours contracts legal in the UK?

Yes, ZHCs are legal. The legislative framework regulates specific aspects (exclusivity clauses prohibited under section 27A ERA 1996 since 2015, right to request predictable terms from September 2024) but does not ban the contract type. Most ZHC workers are 'workers' under section 230 ERA 1996 with statutory rights to minimum wage, holiday, sick pay, anti-discrimination, but not full unfair dismissal protection.

Can my ZHC employer require exclusivity?

No. Section 27A ERA 1996 prohibits exclusivity clauses in ZHCs since 2015. Clauses preventing the worker from working for other employers or requiring permission are unenforceable. The 2015 Regulations also prohibit detriment for the act of working elsewhere - reducing hours or ending engagement because the worker has another job is challengeable.

Do ZHC workers get paid holiday?

Yes, 5.6 weeks of paid holiday per year (the statutory minimum). For irregular-hours workers the Harpur Trust v Brazel decision establishes the full 5.6 weeks regardless of weeks not worked. From April 2024, employers can use 'rolled-up holiday pay' for irregular workers - including a 12.07% uplift in each pay period rather than separate holiday payment when leave is taken.

What is the right to predictable terms?

Under the Workers (Predictable Terms and Conditions) Act 2023, workers (and agency workers) with unpredictable work patterns can request more predictable working terms after 26 weeks of engagement. The request covers number of hours, days and times, and engagement period. The employer must respond within 1 month with reasons; refusal only on specified business grounds. Effective from September 2024.

Can I qualify for a mortgage on a zero-hours contract?

More difficult than for permanent employment but possible. Some specialist lenders accept 12+ months of consistent ZHC income evidenced through bank statements and payslips. Mainstream lenders typically prefer permanent employment. The application typically requires evidence of stable average income over 6-12 months, lower loan-to-value (15-25% deposit), and may carry a small rate premium versus permanent-employed applicants.