Planning and rules
Do I need planning permission for air conditioning?
Plain-English overview of UK domestic air conditioning planning rules: permitted development, listed buildings, conservation areas, flats and when to check with the council.
Last reviewed 2 min read
Typical houses in England
Many wall-mounted split systems on houses can be installed without a full planning application, provided the outdoor unit meets the current size, siting and noise conditions. Those conditions change from time to time, and the council applies them to your specific property.
The Planning Portal (opens in a new tab) sets out the current rules for England. If you want certainty before work starts, you can apply to the council for a Lawful Development Certificate, which confirms that the work doesn’t need planning permission.
What usually decides it
Whether you need consent usually comes down to where the outdoor unit goes and what kind of building it is:
- Where the outdoor unit sits: on a wall facing a road, on a roof, or close to a boundary is more likely to need consent than a rear wall or the ground.
- Noise at the nearest neighbour’s window. Installers can work out the expected noise level for a given unit and position. See our guide to noise and where the outdoor unit goes.
- How many outdoor units there are. Rules are often written around a single unit per property.
- Whether the building is listed, in a conservation area, or covered by an Article 4 direction that removes permitted development rights.
When to check with the council first
Always check first if
the property is listed, in a conservation area or a World Heritage Site, is a flat or maisonette, or the outdoor unit would face a road. Listed buildings usually need listed building consent for external units, even where planning permission isn’t needed.
Flats and leasehold properties usually need the freeholder’s or managing agent’s written consent as well, whatever the planning position. Check the lease before asking for quotes.
Wales, Scotland and Northern Ireland
Planning is devolved, so the rules differ across the UK. If the property isn’t in England, check your local authority’s website rather than relying on guidance written for England.
What installers can and can’t decide
An experienced installer can suggest where an outdoor unit would usually go, estimate the noise level, and tell you whether similar jobs nearby needed consent. They can’t grant permission. The decision rests with the council.
Separately from planning, adding a new electrical circuit is usually notifiable under Building Regulations, and the refrigerant work must be done by an F-Gas certified engineer. Ask installers how they handle both.
Common questions
- Can I put an air conditioning unit on the front of my house?
- Outdoor units on a wall facing a road are more likely to need planning permission, particularly in conservation areas. Check with the council, or ask for a Lawful Development Certificate, before installing one there.
- Do I need permission to install air conditioning in a flat?
- Usually you need the freeholder’s or managing agent’s consent under the lease, and the planning rules for flats are stricter than for houses. Check both before booking an installer.
- Does an installer apply for planning permission for me?
- Some installers will help with an application, but the application is made in the property owner’s name and the decision is the council’s.
This guide is general information, not professional planning, electrical or financial advice. Check the details for your property with the council and a qualified installer.