Builders in Ealing

A large share of Ealing's houses are semi detached or detached, many with a hipped roof, a side passage and a long garden. They have room to grow in every direction: up into the roof, out at the back, and sometimes to the side. The Victorian and Edwardian terraces of West Ealing are more like the rest of West London, with a back addition, a side return and a loft that can be converted.

Larger houses often need more than one change at once. Planning an extension, a loft and a refurbishment of the rest of the house together means the house is opened up once and finished once, and the new rooms and the old ones feel like one home.

On an Ealing semi with a hipped roof, the usual loft conversion is a hip to gable conversion with a rear dormer. Straightening the sloping side of the roof gives the height for a staircase over the existing one and room for a bedroom and a bathroom. On a terrace it is usually a rear dormer, sometimes carried over the back addition.

Our guides cover adding an en suite in the loft, why a loft needs a structural engineer and what a loft conversion costs in London, and our loft conversions page explains which type suits which roof.

On a semi or detached house, the usual extension is a full width single storey room across the back, sometimes with a side extension or a two storey extension on the side. On a terrace it is more often a side return or wraparound. Our guides to rear extensions in London, wraparound extension ideas and what a single storey extension costs cover the choices, and our free extension planner lets you try a layout first.

Applications in W5 and W13 go to Ealing Council. The borough has conservation areas, including Brentham Garden Suburb and the streets around Ealing Common, and inside them a dormer loft conversion is not permitted development and needs planning permission. Outside them, many loft conversions and rear extensions on houses can go ahead as permitted development, and a lawful development certificate confirms it in writing before the build starts.

Flats and maisonettes have no permitted development rights. We check the position for 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 rear dormer loft conversion: £68,000 to £81,000.
• A single storey extension of about 20 m² of new floor, flat roofed, plus making good the room it joins: around £57,000.
• New above ground space at a standard specification: £2,650 to £2,900 per square metre of new floor.

A hip to gable conversion, an en suite or a higher specification adds to the loft figure, and kitchen units, worktops and appliances are priced separately. Our minimum for a complete extension project, including finishes and fittings, is around £85,000. Our loft conversion cost guide and house extension cost guide show the full breakdowns, and the free estimate prices your own project in two minutes.

Our office is in Chiswick, a short drive away, where we converted the loft at Seven Oak to add a bedroom, a bathroom and a study. For homes nearer the Chiswick border, see builders in Acton.

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, plan each job in clear stages and keep the site tidy and considerate throughout.