Are non-compete clauses enforceable in the UK?
By SuLe · Updated 4 June 2026
A UK non-compete clause is void as a restraint of trade unless it goes no wider than reasonably necessary to protect a legitimate business interest — so many are unenforceable as drafted. Where they are upheld, three to twelve months is the practical zone. Narrower tools like non-solicitation, confidentiality and garden leave are often stronger.
Key facts
- Post-termination non-competes are void as restraints of trade unless no wider than reasonably necessary to protect a legitimate business interest.
- Legitimate interests are confidential information, customer connections and workforce stability — not a general wish to avoid competition.
- Roughly 3–12 months is the enforceable zone in practice; shorter and narrower is safer.
- A 2023 government proposal to cap non-competes at 3 months had not been legislated when this was written — check the current status.
- Confidentiality, non-solicitation and garden leave clauses often protect the same interests with less legal risk.
Are non-compete clauses enforceable at all?
They can be, but the starting point is against them. English law treats a post-termination restriction as a restraint of trade that is void unless the employer can justify it.
To be enforceable, a non-compete must go no wider than reasonably necessary to protect a legitimate business interest. The court looks at the interest being protected, the duration, and the geographic and activity scope, all judged at the moment the contract was signed.
This means a clause is not enforceable just because the employee agreed to it. A wide, boilerplate non-compete lifted from a template is one of the most commonly struck-down clauses in employment contracts.
What makes a non-compete reasonable — or void?
Reasonableness turns on protecting a genuine interest with the lightest touch that does the job. Courts recognise three legitimate interests: confidential information and trade secrets, customer or client connections, and the stability of the workforce.
The restriction must be tailored to that interest. A twelve-month ban on a junior employee joining anyone in the sector protects nothing legitimate and will likely fail. A short restriction stopping a senior salesperson from poaching the exact clients they managed is far more defensible.
Duration is decisive. In practice, three to twelve months is the range courts will entertain, with shorter durations much safer. There was a 2023 government proposal to cap non-competes at three months, but it had not been legislated when this was written — check the current status before assuming any statutory cap applies.
What should a startup use instead?
Often, narrower clauses. Courts are more willing to enforce targeted restrictions, and they usually protect what a startup actually cares about.
Non-solicitation clauses stop a leaver approaching your clients or poaching your staff. Confidentiality clauses protect your trade secrets and data indefinitely for genuine secrets. Garden leave keeps a departing employee on payroll but away from work and clients during their notice, cooling their market value without a post-termination ban.
Layering these gives real protection. A tight confidentiality clause, a non-solicit of key clients and staff, and a sensible notice period often beat an aggressive non-compete that a court would refuse to enforce anyway.
| Restriction | What it protects | Enforceability |
|---|---|---|
| Non-compete | Stops working for competitors | Hardest to enforce; must be narrow and short |
| Non-solicitation of clients | Your customer connections | More readily enforced if targeted |
| Non-solicitation of staff | Workforce stability | Generally enforceable if reasonable |
| Confidentiality | Trade secrets, data | Enforceable, can be indefinite for true secrets |
| Garden leave | Keeps leaver off the market during notice | Strong, but you keep paying them |
Worked example
Nadia's B2B SaaS startup wants to protect itself when its head of sales, Owen, leaves. Her template has a 24-month non-compete banning Owen from working anywhere in software — sweeping, and almost certainly void as an unreasonable restraint.
On advice, Nadia replaces it with a tailored package: a six-month non-solicitation of the named accounts Owen managed, a non-poaching clause covering the sales team, a robust confidentiality clause, and a three-month notice period with the option of garden leave. This protects her real interests — client connections and confidential pipeline data — with clauses a court is far more likely to uphold than the original blanket ban.
Where founders go wrong
Copying a wide non-compete from a template
— a blanket ban on working in the sector is the clause most likely to be struck down.Setting the period too long
— beyond twelve months is high-risk; shorter and narrower survives challenge.Trying to prevent competition itself
— that is not a legitimate interest; you can only protect secrets, connections and workforce stability.Ignoring the narrower tools
— non-solicitation, confidentiality and garden leave often give better, more enforceable protection.
Related questions
Are non-competes automatically enforceable if they're in the contract?
No. A post-termination non-compete is void as a restraint of trade unless it goes no wider than reasonably necessary to protect a legitimate business interest. Being written into the contract does not save an overbroad clause — courts assess reasonableness, not the label.
How long can a non-compete last?
In practice, 3 to 12 months is the zone courts will consider enforceable for the right role, with shorter being safer. Anything longer, or covering a whole industry rather than genuine competitors, is at high risk of being struck down as unreasonable.
What counts as a legitimate business interest?
Confidential information and trade secrets, customer and client connections, and workforce stability (stopping mass poaching of your team). The restriction must be tailored to protect one of these — a blanket ban on working in the sector is not a legitimate interest.
Are there gentler alternatives to a non-compete?
Yes, and courts prefer them. Confidentiality clauses, non-solicitation of clients and staff, and garden leave often protect the same interests with far less risk of being unenforceable. Many startups get better protection from these than from an aggressive non-compete.
Restrictive covenants are easy to copy and hard to enforce, and an overbroad clause can leave you with no protection at all when a key hire walks. A SuLe solicitor can draft covenants tailored to the role so they actually hold up. Book a free consultation about your contracts and protect what matters.
Keep reading: What must a UK employment contract include? · What notice period should startup employment contracts use? · Who owns the IP my employees and contractors create? · Are NDAs enforceable in the UK — and are they worth it? · What should an advisor agreement include?
Primary sources: GOV.UK — Employment contracts · Acas — advice and codes of practice
