Do You Need Planning Permission for Air Conditioning in the UK?
For most UK homes, air conditioning falls under permitted development — no planning permission required. Here's when that doesn't apply and what to do about it.
The good news for most UK homeowners is that domestic air conditioning installations fall under permitted development rights — which means planning permission is not required. However, there are several important exceptions, and checking before installation is always wise.
Permitted development: the general rule
For most detached, semi-detached and terraced houses in England, Wales and Scotland, installing an air conditioning system (specifically, mounting an outdoor unit on an external wall or the ground) falls within permitted development under Class G of the GPDO. No planning application is required.
When permitted development does NOT apply
- •Conservation areas: additional restrictions apply. The outdoor unit must not be visible from the street, and in some cases any installation may require consent.
- •Listed buildings: listed building consent is required for any alterations. This applies to the full building, not just the listed components.
- •Flats and apartments: permitted development rights generally do not apply to flats. Some leaseholders may also have lease terms that restrict installations.
- •Article 4 directions: some local authorities have removed permitted development rights in specific areas. Always check with your local planning authority.
- •National Parks and AONBs: additional restrictions may apply.
Scotland and Wales
Planning rules are broadly similar in Scotland and Wales, though specific regulations differ. In Scotland, a 'permitted development right for microgeneration' covers some heat pump installations. We recommend checking directly with your local authority if you're in any doubt.
Practical guidance for conservation area installations
Living in a conservation area doesn't mean you can't have air conditioning — it means the outdoor unit must be sited and screened so it isn't visible from any public highway. In practice, this usually means mounting it at ground level in a rear garden, or on a rear wall below fence-top height. We regularly install systems in Bath's conservation area Georgian properties and are experienced in finding compliant solutions.
The outdoor unit is almost always the planning consideration. The indoor unit, pipework and trunking inside the property are not relevant to planning permission.
Getting confirmation
If you're uncertain whether your installation needs permission, you can apply for a Lawful Development Certificate from your local planning authority. This is a formal confirmation that the installation is permitted development. It costs a small fee and takes several weeks — useful if you plan to sell the property and want documentary evidence.