Do I need planning permission for air conditioning?

When you need permission

For most houses in England and Wales, fitting one outdoor unit is allowed without planning permission under permitted development rules — provided the unit sits at least a metre from the property boundary, isn't on a wall facing a highway, and meets the scheme's noise limit at neighbours' windows.

If any of those tests fail, or if your home is in a conservation area, national park, or is listed, you'll need to apply. Your installer will normally handle the paperwork.

Flats and leaseholds

Flats don't get permitted development rights, so an outdoor unit almost always needs planning permission. Leaseholders also need their freeholder's written consent — a straightforward letter in most buildings.

Managing agents will usually ask for the installer's drawings, the noise assessment, and evidence of insurance. Certified installers keep these to hand.

Conservation areas and listed buildings

In a conservation area, anything visible from the street — including a discreet condenser on the front — generally needs planning consent. On a listed building, listed building consent is also required, whichever wall the unit sits on.

Rear light-wells, side returns and roof spaces hidden from view are the usual solutions.

What installers handle for you

An MCS-certified installer will do the noise assessment, propose a location that meets the rules, draft the planning submission if one is needed, and apply for the £2,500 Boiler Upgrade Scheme grant on your behalf. You sign, they file.