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

So the system you choose changes your planning path in Hackney, 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. With around 28% of Hackney's EPC-certified stock inside a conservation area (Lea Bridge, Albion Square, Clissold Park among them), confirming the exact boundary before you site an outdoor unit is the single most valuable planning step to take here.

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

Hackney carries a lot of conservation-area coverage: around 28.4% of its properties sit inside one, including areas such as Lea Bridge, Albion Square and Clissold Park. Inside those boundaries, the permitted-development route that lets a house fit an outdoor unit is tighter or removed entirely, so a unit on a front or side elevation will usually need planning permission from the London Borough of Hackney.

Applications mentioning cooling equipment have reached Hackney, 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.

Ambient daytime noise across the Hackney 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.

None of this should put you off. Councils across Hackney approve outdoor units for homes exactly like this all the time. Roughly 28.4% 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 5.3% 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.