Croydon: 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 Croydon whatever the property, because on its own it only cools.

In Croydon, the system you choose is a planning decision as much as a comfort one. An air-to-air heat pump on a house qualifies for permitted development because it does both jobs; a unit that only cools is excluded from that route entirely. Croydon carries genuinely low conservation-area coverage, so for a lot of the borough an external unit is a lower-friction proposition than it would be in inner London - an honest advantage, not a workaround.

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 Croydon flat will usually need both freeholder or managing-agent consent and planning permission.

Planning is more straightforward in Croydon than in a lot of the country: only around 6.2% of properties sit inside a conservation area, so most houses can use the permitted-development route for an outdoor unit. Flats are still treated differently, and will usually need the London Borough of Croydon's planning permission for a front or side unit.

We hold some decided cooling cases for Croydon and not enough to say anything with. The sample-size floor is there precisely to stop a thin record turning into a confident-looking statistic.

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.

Ambient daytime noise across the Croydon property types we profile averages around 50 dB, and that background level matters as much as the machine's own rating: the same unit that vanishes against a main road can be the loudest thing in a quiet back garden.

Siting is the lever. Keeping the outdoor unit away from a neighbour's window and back from the boundary is what most often turns a marginal case into an approved one.

Nothing here is a dealbreaker. Croydon's council approves outdoor units for homes like these routinely. Conservation-area coverage locally runs at around 6.2%, which makes this worth planning for rather than assuming. Proximity to a listed building - around 0.6% of homes here sit within 30 metres of one does not mean your own home is listed, and public data can flag a conservation-area question without answering it. Treat this as indicative guidance, not legal advice, and confirm the final position with your Local Planning Authority before installing.