What Is a Breach of Planning Control?

A breach of planning control is defined in section 171A of the Town and Country Planning Act 1990. It means either (a) carrying out development without the planning permission required for it, or (b) failing to comply with any condition or limitation attached to a planning permission. Either form of breach can trigger enforcement action by the local planning authority — but the council must first apply the 'expediency test' and decide whether enforcement is in the public interest.

The legal basis

The framework is set out in three pieces of primary legislation:

Town and Country Planning Act 1990 — the main statute. Section 171A defines a breach; sections 171B to 187B set out the time limits, notices and remedies.
Planning and Compensation Act 1991 — introduced the Planning Contravention Notice and broadened enforcement powers.
Localism Act 2011 and Levelling-up and Regeneration Act 2023 — further refinements, including the deliberate concealment rules and the 25 April 2024 extension of the 4 year rule.

What counts as a breach

A breach can take several forms:

The categories of breach

Building, engineering or operational works carried out without permission — extensions, outbuildings, hardstandings, walls, fences over the height limit.
Material changes of use — converting a house to a HMO, an annex to a guesthouse, a barn to residential, a shop to a takeaway.
Breaches of conditions on an existing permission — failing to comply with a landscaping requirement, hours of operation, materials specification, or use restrictions.
Works to listed buildings without listed building consent — even minor alterations require consent and unauthorised works are a criminal offence.
Unauthorised advertisements — displays that exceed the Advertisement Regulations.
Section 215 untidy land — dilapidated buildings, hoardings, sites that adversely affect the amenity of the area.

The expediency test

Even where a breach has clearly occurred, the council must apply the expediency test before taking enforcement action. The National Planning Policy Framework requires councils to act proportionately. This is the reason most breaches are dealt with through an invitation to apply for retrospective consent rather than direct enforcement. The questions an enforcement officer will ask are:

Would the development be granted permission if applied for now?
Is there genuine harm to neighbours, character or the wider environment?
Is enforcement proportionate to the breach?
Would resources be better used elsewhere?

If the answer to the first question is yes and the harm is minor, the council will usually invite a retrospective application rather than serve an Enforcement Notice. This is the policy reason why around 70% of retrospective applications are approved.

Why councils invite retrospective applications

An invitation to apply retrospectively is not a sign of weakness on the council's part. It is the cheapest and most efficient route to resolution for everyone — the council gets a properly drafted application to assess, the homeowner gets a structured process with clear deadlines, and the planning system records a formal decision rather than an open enforcement file. It is also the route that planning law explicitly provides for in section 73A.

The honest summary

A breach of planning control is a legal term with a clear definition and a proportionate response built into the system. Most breaches are minor, most are approvable, and most can be resolved through a properly drafted retrospective application — without the need for enforcement notices, appeals or demolition.

Frequently asked questions

Is a breach of planning control a criminal offence?

Generally no — a breach of planning control by itself is not a criminal offence. It only becomes a criminal matter if you fail to comply with an Enforcement Notice once it has been served, or if the works affect a listed building (where unauthorised works are a criminal offence from the moment they are carried out).

How does the council find out about breaches?

Most breaches are reported by neighbours. Other sources include aerial imagery, council tax revaluations, building control records, and conveyancing searches that flag missing planning history when a property is sold.

What is a Planning Contravention Notice?

A formal notice requiring you to provide information about the works, ownership, occupation and history of the site. You must respond within 21 days. Failure to respond is a criminal offence.

Can I be fined for a breach of planning control?

Not directly. Fines apply when you fail to comply with a formal Enforcement Notice or a Stop Notice, or when you provide false information in response to a Planning Contravention Notice. The fine is at the discretion of the magistrates' court.

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