Hammersmith and Fulham: 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 Hammersmith and Fulham whatever the property, because on its own it only cools.

In Hammersmith and Fulham, 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. With around 52% of Hammersmith and Fulham's EPC-certified stock inside a conservation area (St. Peter's Square, The Mall, Hurlingham 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 Hammersmith and Fulham flat will usually need both freeholder or managing-agent consent and planning permission.

Hammersmith and Fulham carries a lot of conservation-area coverage: around 51.7% of its properties sit inside one, including areas such as St. Peter's Square, The Mall and Hurlingham. 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 Hammersmith and Fulham.

Hammersmith and Fulham has decided 81 planning applications mentioning air conditioning or other cooling plant across all development types, 28 of them householder applications, and approved 96.3% of that 81.

Put as counts: 78 went through, 3 did not.

Householder applications alone tell a slightly different story, and they are the ones that resemble your case: 100% of the 28 were approved.

Read 81 as a floor, not a total: the deep historical backfill has not yet covered Hammersmith and Fulham, so earlier decisions are missing from it.

These are applications whose own description names cooling equipment. An application that installed the same kit but described it as external plant is not in the Hammersmith and Fulham count.

A different question, kept separate on purpose: 93.3% of the 45 applications mentioning an air-source heat pump that Hammersmith and Fulham has decided were approved. Air-source usually means a heating scheme, not a cooling one, and an application can sit in both sets, so the two figures are never summed or averaged.

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 Hammersmith and Fulham property types we profile average roughly 55 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.

Nothing here is a dealbreaker. Hammersmith and Fulham's council approves outdoor units for homes like these routinely. Conservation-area coverage locally runs at around 51.7%, which makes this worth planning for rather than assuming. Proximity to a listed building - around 2.1% 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.