What constitutes a breach of planning control?

The legal definition has two limbs: development without the required permission, and non-compliance with conditions or limitations on a permission. "Development" covers building, engineering and other operations, plus material changes in how land or buildings are used.

Common examples are more mundane than people expect: an extension a metre deeper than the approved drawings, a garden building taller than permitted development allows, a loft dormer on a house stripped of its rights by an Article 4 direction, a home converted to short-lets where that's a material change of use — or simply ignoring a condition requiring obscured glass in a side window.

Some things people assume are planning breaches aren't. Building regulations violations, party wall disputes and boundary arguments run through entirely separate regimes. And works that never amounted to development — internal alterations, like-for-like repairs — can't breach planning control at all.

Councils respond proportionately. The toolkit runs from informal letters and retrospective applications through breach of condition notices and enforcement notices, up to stop notices for serious harm. Only defying a notice crosses into criminal territory, with unlimited fines available.

Two exceptions to the "not criminal" rule are worth knowing: unauthorised works to a listed building and unauthorised advertisement displays are offences in themselves. If heritage is involved, the stakes rise immediately.

Breaches also expire: enforcement generally can't reach development once 4 years (pre-25 April 2024 completions) or 10 years (later work and changes of use) have passed — though deliberately concealed breaches don't get the benefit of the clock.