Do I need planning permission for air conditioning in the UK?
Usually no. Most houses can have an air-conditioning outdoor unit installed under permitted development rights, provided the unit meets the size and siting conditions (one unit, sensible position, not on the principal elevation facing a highway in some cases). The common exceptions: flats and maisonettes (freeholder/management consent, and planning rules differ), listed buildings (consent needed), and conservation areas (extra siting restrictions). We confirm which applies at the survey — before you commit.
Houses — usually straightforward
For a typical house, a single outdoor unit positioned sensibly (rear or side wall, off the ground or on it) falls within permitted development. Noise conditions still apply — the unit must not be a nuisance to neighbours, which good siting and modern quiet units handle comfortably.
Flats — ask first, always
Leaseholders almost always need freeholder or management-company consent for an outdoor unit, separate from planning. Getting that in writing first avoids expensive arguments later — we can supply the spec sheet and noise data that makes the request easy.
Listed buildings and conservation areas
Listed buildings need listed building consent for external plant, full stop. Conservation areas restrict siting on visible elevations. Neither is necessarily a no — it's a 'route it properly' — and we've done both.