Wandsworth: air conditioning planning permission

Since 2025-05-29, England's permitted-development rules let a house fit an air-to-air heat pump - which heats as well as cools - without a planning application in many cases, within set size, siting and noise limits. A cooling-only air conditioning unit does not get that route and needs a full planning application in Wandsworth whatever the property, because on its own it only cools.

So the system you choose changes your planning path in Wandsworth, not just your comfort. The same box that both heats and cools opens the permitted-development route on a house; a unit that only cools does not. About 23% of Wandsworth's EPC-certified stock falls inside a conservation area, concentrated around Charlwood Road and Lifford Street, Clapham Common, Coalecroft Road; most homes sit outside one, but it is still worth checking the boundary before you commit to a wall-mounted unit.

Flats are the sharpest exception here as everywhere in England: the permitted-development right for an outdoor unit sits with the house, not the flat, so a Wandsworth flat will usually need both freeholder or managing-agent consent and planning permission.

Neither notably high nor low, Wandsworth's conservation-area coverage sits around 23.1% of properties, with Charlwood Road and Lifford Street, Clapham Common and Coalecroft Road among the named areas. That middling figure means your outdoor unit's permitted-development position depends more on exactly where in the borough you are than it would in a more clear-cut area.

Applications mentioning cooling equipment have reached Wandsworth, but none has been determined yet. Without decided cases there is no approval rate to publish, and an undecided application tells you nothing about how it will land.

What actually gets refused, and what councils attach when they approve, is a national picture rather than a local one at the volume of officer reasoning currently published. We set both out with their sample sizes: why cooling applications get refused and the conditions councils attach.

You can also compare what each council decides, where enough decisions exist to publish a figure.

The Wandsworth property types we profile average roughly 54 dB of daytime background noise, and a unit is judged against that baseline rather than in the abstract.

So siting decides more than the equipment does. Moving the outdoor unit away from a neighbour's window and off the boundary line is the single change that most often rescues a borderline application.

None of this should put you off. Councils across Wandsworth approve outdoor units for homes exactly like this all the time. Roughly 23.1% of properties sit inside a conservation area, and it is still a genuine step rather than a rubber stamp. Being near a listed building - around 2.5% of homes here sit within 30 metres of one is not the same as being listed yourself, and public records can raise a conservation-area flag without resolving it. This stays indicative, not legal advice: confirm with your Local Planning Authority before you install.