Zero hours contract law UK employers most need to understand comes down to a handful of rules. A zero-hours contract, where the employer does not guarantee any minimum hours and the individual is not always obliged to accept work offered, is legal in the UK, but it is not a way around statutory rights. Since 2015 the Employment Rights Act 1996 has banned exclusivity clauses in these contracts, meaning you cannot stop a zero-hours worker taking work elsewhere. Zero-hours workers are still entitled to at least the National Minimum Wage for hours actually worked, to paid holiday, and to protection from unlawful discrimination. This guide explains what is and is not legal for zero-hours arrangements in England and Wales in 2026, and how you can draft a compliant contract from vetted clauses in 99 Data Rooms. It is general information, not legal advice.
Zero-hours contracts suit genuinely variable work: seasonal peaks, event staffing, ad-hoc cover, early-stage businesses that cannot yet commit to fixed rotas. They get a bad reputation when employers use them to dodge obligations they still owe. The legal framework is designed to stop exactly that, so the safest approach is to treat a zero-hours worker as a worker with real rights, and to write the contract accordingly.
The exclusivity ban: the rule that catches employers out
The headline rule is the exclusivity ban. Since May 2015, the Employment Rights Act 1996 (Part 2A, inserted by later reform) has made exclusivity clauses in zero-hours contracts unenforceable. In plain terms, you cannot include a clause that stops a zero-hours worker from working for someone else, and you cannot penalise them for doing so. If you offer no guaranteed hours, the law will not let you demand exclusivity in return; that would leave the worker with neither security nor freedom.
This matters because plenty of old templates still carry exclusivity wording copied from standard employment contracts. If you reuse one of those for a zero-hours role, the clause is void, and dismissing or subjecting a worker to a detriment for ignoring it can itself give rise to a claim. Acas, the workplace advice body, sets out the position clearly and is a sensible reference point for employers (see Sources). The practical fix is to draft from a template written for zero-hours work in the first place, rather than bolting hours-optional language onto a fixed contract.
Minimum wage, holiday and the rights that still apply
The second thing employers get wrong is assuming that "no guaranteed hours" means "reduced obligations". It does not. For every hour a zero-hours worker actually works, they must be paid at least the relevant National Minimum Wage or National Living Wage rate for their age band, which gov.uk updates each April (see Sources). There is no zero-hours discount.
Holiday is the area people most often miscalculate. Zero-hours workers accrue paid holiday under the Working Time Regulations 1998, just like other workers, based on the hours they actually work. The statutory entitlement is 5.6 weeks a year, and for variable-hours workers this is usually worked out as a proportion of hours worked rather than a fixed number of days. Getting the calculation right, and paying holiday properly rather than rolling it into the hourly rate in a way that is not transparent, is a common compliance gap. gov.uk explains the entitlement and the current guidance on calculating it (see Sources).
Zero-hours workers also keep other core protections: they cannot be discriminated against unlawfully, they are entitled to rest breaks under the Working Time Regulations, and depending on their employment status they may accrue further rights over time. What they typically do not get, because no minimum hours are guaranteed, is the certainty of a fixed income, which is precisely why the exclusivity ban exists to preserve their freedom to top up elsewhere.
Worker, employee or self-employed? Getting status right
A recurring trap is labelling. Calling a contract "zero-hours" does not by itself decide someone's employment status, and neither does the paperwork if the reality differs. Most zero-hours individuals are "workers", a category that sits between employee and genuinely self-employed and carries minimum wage, holiday and discrimination protection. Some, depending on how the relationship actually operates, may be employees with fuller rights. A tribunal looks at the real working relationship, not just the label on the document.
This is the same principle that governs contractor arrangements, where the wording of a contract cannot override how the work is actually done. If what you really want is a genuine contractor rather than a casual worker, the honest route is a consultancy arrangement, and you should read our guide on IR35 and consultancy agreements before deciding. If instead you need a standard fixed role, our guide to what every UK employment contract must include sets out the day-one written statement and the statutory floors. Choosing the right structure at the start avoids expensive re-labelling later.
How 99 Data Rooms handles zero-hours contracts
Drafting a zero-hours contract that respects the exclusivity ban, states the hourly rate correctly, and handles holiday transparently is exactly the kind of routine, rules-driven document the AI Legal Drafting feature in 99 Data Rooms is built for. The important point is what it does not do: it does not write legal wording from scratch and it does not let a language model invent clauses. It assembles a document from a library of vetted England and Wales clauses, chosen by your answers. Vetted clauses, assembled, not AI-written law. You can see the full Legal Drafting template library on our site.
In practice you open the zero-hours contract template from the library, or describe what you need in plain words, then answer a few questions: the role, the hourly rate, how holiday will be handled, notice arrangements. The drafter fills the blanks with the matching vetted clauses, notably leaving out any exclusivity wording that would be void, and saves a draft you keep even on the free tier. Because it is a starting point rather than finished advice, anything unusual is worth a human review before you rely on it.
The document then flows into the rest of the platform. You send the contract as a tracked, revocable link rather than an email attachment, gate it behind a verified email and one-time code so only the intended worker opens it, and use page-by-page analytics to confirm they read it. When both sides are ready, it goes to e-signature in the browser and returns as an executed PDF with an audit certificate recording who signed, when, their IP and intent, plus a SHA-256 fingerprint. Drafted, gated, tracked, signed, revocable, in one place. The wider platform is in beta and improving fast, but that loop already works today.
Draft your zero-hours contract for free
You can draft a compliant England and Wales zero-hours contract from vetted clauses, keep the draft, and share or sign it inside 99 Data Rooms. The free tier is a real tier, not a trial: three rooms, twenty-five active links, forever, no card required. Start for free, assemble the contract you need, and move up only when you want unlimited links, NDA gating or watermarking. The platform is in beta and improving fast, but the path from "I need a casual contract" to "it is signed" already runs in one place.
Sources
- Ban on exclusivity clauses in zero-hours contracts: Employment Rights Act 1996, Part 2A, https://www.legislation.gov.uk/ukpga/1996/18/part/2A ; Acas guidance on zero-hours contracts, https://www.acas.org.uk/zero-hours-contracts
- National Minimum Wage and National Living Wage rates: gov.uk, https://www.gov.uk/national-minimum-wage-rates
- Statutory holiday entitlement of 5.6 weeks: gov.uk, https://www.gov.uk/holiday-entitlement-rights ; Working Time Regulations 1998, https://www.legislation.gov.uk/uksi/1998/1833
Are zero-hours contracts legal in the UK in 2026?
Yes. Zero-hours contracts are legal in the UK, where the employer guarantees no minimum hours. What is not legal is using them to avoid statutory rights: minimum wage, holiday and discrimination protection all still apply, and exclusivity clauses are banned (see Sources). This is general information, not legal advice.
Can I stop a zero-hours worker from working for someone else?
No. Exclusivity clauses in zero-hours contracts have been unenforceable since 2015 under the Employment Rights Act 1996. You cannot prevent a zero-hours worker taking other work, and penalising them for doing so can give rise to a claim (see Sources).
Do zero-hours workers get holiday pay?
Yes. Zero-hours workers accrue paid holiday under the Working Time Regulations 1998 based on the hours they actually work, up to the 5.6-week statutory entitlement. The calculation is usually proportional to hours worked (see Sources).
Is a zero-hours worker an employee?
Usually they are a "worker" rather than an employee, a category carrying minimum wage, holiday and discrimination rights. Some may be employees depending on how the relationship actually operates. The label on the contract does not decide it; the real working relationship does. Our employment contract guide covers the fixed-role alternative.
When should I use a consultancy agreement instead?
When you genuinely want an independent contractor rather than a casual worker. That route brings IR35 considerations into play, and the contract wording cannot override how the work is really done. Our guide on IR35 and consultancy agreements explains the difference before you choose.