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

So the system you choose changes your planning path in Dover, 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. Roughly 12% of Dover's EPC-certified homes fall inside a conservation area, concentrated in areas like Alkham, Ash - Guilton, Ash - Street End - most addresses are outside one, but the boundary check is worth doing before committing 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 Dover flat will usually need both freeholder or managing-agent consent and planning permission.

Dover lands close to the national middle on conservation coverage - about 12.4% of properties, including parts of Alkham, Ash - Guilton and Ash - Street End. With no clear-cut high or low figure to lean on, the permitted-development answer for an outdoor unit here turns more on your exact location than the borough-wide average.

96.4% of the 28 planning applications mentioning air conditioning or other cooling plant that Dover has decided were approved, a figure covering all development types and including 10 householder applications.

The same figures as counts are 27 approved and 1 refused.

A householder-only rate would be the more useful number, and Dover has not yet decided enough of them for one: 10 is below the sample size we publish a percentage from.

One more thing about the method: applications are identified from their own description, so the Dover figures cover applications mentioning cooling equipment and will understate rather than overstate real activity.

Dover has also decided 23 applications mentioning an air-source heat pump, 100% of them approved. That is a separate measure from the cooling figures above, since most air-source installations heat rather than cool and the two sets overlap.

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 Dover property types we profile averages around 39 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 Dover approve outdoor units for homes exactly like this all the time. Roughly 12.4% 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 7.1% 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.