Do you need planning permission for air conditioning in the UK?

Usually not — but "usually" is doing some work in that sentence. Here's what typically applies, and when you should check with your own council before assuming.

Permitted development, in most cases

Systems that both heat and cool — acting as an air-source heat pump, which is what most modern split systems do — generally fall under permitted development rules in the UK, meaning a separate planning application usually isn't required for a domestic installation.

The 1-metre boundary rule

The outdoor condenser unit typically needs to sit at least 1 metre from a neighbouring property's boundary. This is a common trigger for needing formal permission if your property's layout makes that distance impossible to achieve.

Noise limits

Outdoor units must meet local council noise limits so they don't become a legal nuisance to people nearby. This is assessed against your specific installation location and the unit's rated noise output, not a fixed number that applies everywhere.

When you'll almost always need formal permission

• Listed buildings — any external alteration typically needs listed building consent.
• Conservation areas — permitted development rights are often restricted or removed entirely.
• Flats and maisonettes — these generally fall outside the permitted development rules that apply to houses, so formal permission or freeholder/landlord consent is usually needed.

Commercial installations

Commercial premises typically need landlord and/or council approval for external condenser units, on top of the energy and F-Gas compliance requirements that apply once a system is installed — see our F-Gas certification guide for more on that side of things.