A non-compete clause is the contractual provision most likely to look strong on paper and collapse in court. Businesses draft them broadly to feel protected; English law starts from the opposite premise, that a clause restraining someone from competing is void unless it can be justified. The gap between how confidently these are written and how sceptically they are enforced is where a lot of expensive litigation lives.
Here is how English law actually treats non-competes, illustrative wording, and the factors that decide whether one is worth anything.
The starting point: restraint of trade is void
This is the rule that surprises people. Under the English-law doctrine of restraint of trade, a clause that restricts a person's freedom to work or compete is prima facie void and unenforceable, unless the party relying on it can show two things: that it protects a legitimate business interest, and that it goes no further than reasonably necessary to protect that interest.
So the burden is the other way round from most clauses. The party who wants to enforce a non-compete has to justify it; a court will not rewrite an overbroad one into something reasonable, with a narrow exception for severance of clearly separable wording. Draft it too wide and you often lose the whole thing.
What counts as a legitimate interest
Not we do not want competition. Courts recognise a narrower set of interests worth protecting.
- Confidential information and trade secrets.
- Client and customer connections: relationships the person could exploit.
- Workforce stability: protecting against poaching of staff, usually through non-solicitation of employees.
A clause has to aim at one of them
A clause aimed at any of those interests has a chance. A clause aimed simply at stopping someone being a competitor does not.
The reasonableness factors
Whether a non-compete goes no further than necessary turns on three dimensions, judged together.
- Duration. Reasonable: a few months, matched to how long the interest stays live. Vulnerable: multi-year blanket bans.
- Geography. Reasonable: where the business and its clients actually are. Vulnerable: worldwide, for a regional business.
- Scope of activity. Reasonable: the specific role or client connections. Vulnerable: any involvement with any competitor.
Precision is protection
The tighter each dimension, the more likely it holds. And they interact: a longer duration might survive if the geography and activity are narrow, but a clause that is broad on all three is the classic casualty.
The instinct to draft a non-compete as widely as possible is exactly backwards. A narrow, clearly justified clause is more valuable than a sweeping one, because the narrow one is enforceable and the sweeping one is often void in its entirety. Precision is protection here, not weakness.
Illustrative wording
Illustrative only:
"For [6] months after the Termination Date, the Employee shall not, within [the territory in which they worked in the 12 months before termination], be engaged in any business that competes with those parts of the Company's business in which the Employee was materially involved during that period."
Note how it ties duration, geography and activity to what the person actually did: that linkage is what makes it defensible.
Related restraints, and garden leave
Non-competes rarely sit alone. Employers usually pair them with non-solicitation (of clients) and non-dealing (with clients) clauses, which are often easier to justify than a full non-compete because they are narrower. Garden leave, keeping a departing employee on the payroll but away from work during notice, can achieve some of the same protection and interacts with any post-termination restraint: courts may set garden-leave time off against the restraint period.
Note that employment and commercial contexts differ. A non-compete between sophisticated businesses, for example on the sale of a business, is judged more generously than one imposed on an employee, where courts are most protective.
Frequently asked questions
Are non-compete clauses enforceable in the UK? Only if they protect a legitimate business interest and go no further than reasonably necessary to do so. As a restraint of trade, a non-compete is otherwise void, and the party relying on it bears the burden of justifying it.
What makes a non-compete unenforceable? Excessive duration, geography or scope of activity: anything broader than needed to protect the legitimate interest. Courts generally will not narrow an overbroad clause to save it, so drafting too widely risks losing it entirely.
What is a legitimate business interest? Confidential information and trade secrets, client and customer connections, and workforce stability. A general wish to avoid competition is not a legitimate interest.
What is the difference between non-compete, non-solicitation and non-dealing? A non-compete bars competing generally; non-solicitation bars approaching clients or staff; non-dealing bars doing business with them even if they approach first. The narrower restraints are often easier to enforce.
How long can a non-compete last? There is no fixed limit, but shorter is safer, often a few months, matched to how long the protected interest realistically remains live. Multi-year bans are hard to justify.
Reading this clause across a whole data room
When a team resigns, or a business is bought, the restrictive covenants that matter are spread across dozens of employment contracts signed at different times on different templates. LegalAI Space's Document Review grid takes those contracts as rows and asks each the same questions: how long the non-compete runs, what territory it covers, what activity it restrains, and whether there is a garden leave set-off. Each cell carries the answer, the passage it was taken from, and a link that opens the contract at that clause, so the one contract with a two-year worldwide restraint is one row that reads differently from the rest.
The grid extracts duration, geography and scope; whether a particular restraint is reasonable for a particular role is a fact-sensitive question it does not answer, and an over-broad clause it extracts faithfully may still be worthless. The Document Review page describes the grid and the employment playbook, and the workflow Rebuild garden leave and covenant terms after a resignation shows the restraints being read together at the moment they are needed. Both are linked below.
