Builders in Acton

The Victorian and Edwardian terraces of central and south Acton usually have a back addition with a side return beside it and a loft that can be converted. The interwar semis further north tend to have a hipped roof, a side passage and a longer garden. Bedford Park is different again: red brick houses with tall roofs, gables and detailed joinery, designed as a garden suburb and protected as a conservation area.

Whatever the house, we start with a proper survey, so the structure, the drainage and the state of the wiring and plumbing are known before the design is fixed and the price is agreed.

On a terrace, most kitchen extensions fill the side return or wrap round the back as one room facing the garden. On a semi there is usually room for a full width rear extension, sometimes with a side extension into the passage. Our guides to kitchen extensions in West London, rear extension or side return and what a single storey extension costs cover the choices.

Our house extensions page explains how we take an extension from survey to handover, and you can try a layout on a home like yours in our free extension planner.

On an Acton terrace the usual loft conversion is a rear dormer, sometimes carried over the back addition. On an interwar semi it is usually a hip to gable conversion with a rear dormer, which turns the sloping side of the roof into a full gable and makes room for a staircase over the existing one. In Bedford Park, roof changes need planning permission and are expected to respect the original design. Our loft conversion cost guide and loft conversions page go into more detail.

Most of Acton is in the London Borough of Ealing, so applications usually go to Ealing Council. Bedford Park is split between Ealing and Hounslow, and its conservation area status means the street side of a house is protected far more closely than the back. Inside a conservation area a dormer loft conversion is not permitted development and needs planning permission.

Outside conservation areas, many rear extensions and lofts on houses can go ahead as permitted development, and a lawful development certificate confirms it in writing. Flats and maisonettes have no permitted development rights. We check your address early, prepare the drawings and manage the application, along with any party wall agreements.

Typical London jobs priced on our estimator in October 2026, ex VAT and indicative rather than a quotation:

• A single storey extension of about 20 m² of new floor, flat roofed, plus making good the room it joins: around £57,000.
• A rear dormer loft conversion: £68,000 to £81,000.
• New above ground space at a standard specification: £2,650 to £2,900 per square metre of new floor.

Kitchen units, worktops and appliances are priced separately. Our minimum for a complete extension project, including finishes and fittings, is around £85,000. Our house extension cost guide and loft conversion cost guide show the full breakdowns, and the free estimate prices your own project in two minutes.

Our office is at Gable House on Turnham Green Terrace in Chiswick, a few minutes from Acton Green. Nearby we converted the loft at Seven Oak, adding a bedroom, a bathroom and a study. For homes further west, see builders in Ealing.

Every project runs as one design and build service, with a single team responsible from concept to completion. We carry £10M public and employers' liability cover and plan parking, deliveries and working hours with your street in mind.