You can extend a house in Acton, but expect to ask permission for most of it. Hundreds of listed buildings. Seventeen conservation areas. Clay under every street, the kind that shrinks and swells with the weather. The builder is often the easy part, and the council and the ground are the hard ones.
Historic England lists 293 buildings in and around Acton. None is Grade I, nine are Grade II* and 284 are Grade II. Any change to a listed building that affects its character needs listed building consent on top of any planning permission, and that covers inside work as well as the outside: a fireplace, a staircase, a window frame. Nothing here makes the national top tier, but 284 Grade II entries is plenty to keep the council's conservation officers busy.
Seventeen conservation areas overlap the area, including Bedford Park, Acton Green, Acton Park, Creffield, the Glebe Estate and Acton Town Centre. Inside a conservation area the council takes a closer interest in anything that changes how a street looks, and some work that would go ahead without an application elsewhere needs one here. The streets people move to Acton for, because of how they look, are the ones where those looks are protected.
The neighbours have not been put off. Ealing logged 2,037 planning applications in the area between April 2024 and July 2026, and 811 in the latest twelve months. That is a steady stream of people deciding the building they own should be a little bigger, a little different or a little more theirs.
The ground has its own opinion. The British Geological Survey puts Acton's shrink-swell hazard at class 3, and every part of the area reaches that class. Clay at that level swells when wet and shrinks when dry, so an extension here usually needs deeper foundations than a builder would dig on sand, plus a structural engineer's view of nearby trees and drainage. The clay under Acton moves, so the first thing any extension here pays for is a deeper hole.
Ten listed buildings in the area are on Historic England's Heritage at Risk register. These are buildings in poor condition, where repair can attract grant money and will certainly attract scrutiny. They are a matter for whoever owns them, and they make no difference to the owner of an ordinary terrace a few streets away.
In practice, what you can do depends on what you own and where it is. A house outside the conservation areas and off the listed register keeps the usual householder permitted development rights, so many single-storey rear extensions and loft conversions can go ahead without a full application. Inside a conservation area those rights shrink, and on a listed building almost everything needs consent. About seven in ten homes in Acton are flats, and flats have no householder permitted development rights at all, so most owners here are asking the freeholder as well as the council. Ealing's conservation-area maps show whether a particular address is inside one of the seventeen boundaries, and that boundary can split a street down the middle.
Freedom to change your home is about as limited in Acton as anywhere in west London. Buy here for the house as it stands, and treat any extension as a project the council and the clay will both have a hand in.