House Extensions & Loft Conversions in Ealing

LCCL Construction is a design and build company based in Finchley N3, working in Ealing. One team, one contract: architects, structural engineers, project managers and builders coordinated by LCCL take your project from first sketch to handover.

Ealing's Edwardian and 1930s houses — Ealing Common, Hanwell, Northfields — have good rear gardens for kitchen extensions with rooflights, and roofs that suit rear dormers and hip-to-gable lofts on the semis.

What it costs in Ealing

The final figure depends on postcode, access and site conditions — the instant estimate applies your area. Guide ranges for 2026, design and build inclusive (architecture, structural engineering, planning or LDC, construction, project management and building control). Every project is surveyed and priced individually.

• Velux loft: £32,400 – £50,400 inc. VAT (£27,000 – £42,000 + VAT)
• Rear dormer loft: £56,400 – £80,400 inc. VAT (£47,000 – £67,000 + VAT)
• L-shaped dormer: £58,800 – £98,400 inc. VAT (£49,000 – £82,000 + VAT)
• Hip to gable: £60,000 – £114,000 inc. VAT (£50,000 – £95,000 + VAT)
• Mansard: £76,800 – £148,800 inc. VAT (£64,000 – £124,000 + VAT)
• Rear extension: £42,000 – £90,000 inc. VAT (£35,000 – £75,000 + VAT)
• Side return: £42,000 – £93,600 inc. VAT (£35,000 – £78,000 + VAT)
• Wraparound: £72,000 – £153,600 inc. VAT (£60,000 – £128,000 + VAT)
• Double storey: £90,000 – £198,000 inc. VAT (£75,000 – £165,000 + VAT)

Kitchen on top of the structure, supplied and fitted: +£9,000 – £87,360 inc. VAT (£7,500 – £72,800 + VAT) depending on size and specification. Basements: cellar refit £54,000 – £114,000 inc. VAT (£45,000 – £95,000 + VAT), lowering £114,000 – £216,000 inc. VAT (£95,000 – £180,000 + VAT), new dig £216,000 – £360,000 inc. VAT (£180,000 – £300,000 + VAT)+. New build: £2,200 – £4,500 per sqm (zero-rated for VAT).

Recent LCCL projects near Ealing

Second Avenue, Queen's Park W10 — side return extension

A side return extension to a Victorian terrace in Queen's Park: the narrow side passage brought inside to make a full-width open-plan kitchen.

See the project

Also nearby: Victoria Road, Maida Vale W9 (kitchen extension, 2025).

Planning in Ealing

Ealing runs standard householder routes with prior approval for larger rear extensions; Ealing Common, Hanwell and Brentham Garden Estate conservation areas need planning permission for roof and front changes.

Permitted development in Ealing: what goes ahead without a planning application

Usually permitted development outside the estates with directions. Ealing’s Article 4 directions cover the Brentham Garden Estate, Bedford Park, Hanger Hill Garden Estate, Hanger Hill (Haymills), Churchfields and The Grove; on the ordinary streets outside them, lofts and single-storey rear extensions go ahead without a planning application. Flats and maisonettes have no permitted development rights, whatever the street, and inside any conservation area a dormer or roof enlargement needs a planning application even where a single-storey rear extension within the limits does not.

On a house outside those streets, a rear dormer loft (40 m³ on a terrace, 50 m³ on a semi or detached house), a hip-to-gable, a single-storey rear extension of 3 m (4 m on a detached house) and a side-return infill are permitted development, and we apply for a Lawful Development Certificate on every one so the position is confirmed in writing. See our fixed-price permitted development projects — from £32,400 inc. VAT (£27,000 + VAT) for a Velux loft and £42,000 inc. VAT (£35,000 + VAT) for a 3 m rear extension, design and build inclusive, postcode dependent. Not sure whether your project needs a planning application?

Planning check

Conservation areas and Article 4 directions in Ealing

Ealing calls itself the Queen of the Suburbs, and its 30 conservation areas are “a rich assortment of nineteenth and early twentieth century residential development” shaped by the Garden City movement. Around W5 they are Ealing Common (designated 1982, extended 2004), Ealing Green (1969, extended 1982, 1992 and 2004), Mount Park (1991), Haven Green (1982), St Stephen’s (2004), Ealing Cricket Ground (2004) and Brentham Garden Estate (1969). Article 4 directions apply in Brentham (direction 1976), Bedford Park, Hanger Hill Garden Estate, the Hanger Hill (Haymills) Estate, Churchfields and The Grove in the town centre, removing some permitted development rights; Ealing Common, Ealing Green, Mount Park, Haven Green and St Stephen’s have none, so replacement windows there remain permitted development while roof, side and two-storey rear extensions need planning permission. Hanwell (W7) and West Ealing (W13) outside the conservation areas take lofts and rear extensions on a Lawful Development Certificate, with the larger 6 m or 8 m extension through prior approval.

The rules Ealing applies

Ealing decides householder applications under policy 7B of its Development Management DPD (adopted 10 December 2013), which asks for good daylight, sunlight and privacy, and its long-standing SPD 4 on residential extensions (2004): single-storey rear extensions up to 3 m deep and 3 m high; side extensions no higher than 3 m at single storey, with a first floor set back at least 1 m from the front wall, 1 m in from the side boundary and a ridge at least 0.5 m below the main roof; dormers at least 0.5 m from the ridge, edges and eaves, with front dormers rarely acceptable and hip-to-gable conversions on semis and terraces normally refused; and at least 50 m² of garden retained (75 m² for larger houses). There is no fixed 45-degree rule — we design to it anyway — and no numerical basement standard.

Fees and timescales

A householder application costs £548 (from April 2026, plus the Planning Portal charge) with an eight-week decision period. Ealing has no householder pre-application category; instead it offers a 30-minute planning appointment at £311.40 for verbal advice or £386.14 with written advice within ten working days. A new Local Plan was submitted for examination in November 2024. Party wall notices run alongside planning: two months’ notice for works to a shared wall, one month for excavations within 3 m or 6 m of a neighbour’s foundations.

Building control

Ealing runs its own building control service. We use the council inspector on every project. Typical inspection points are commencement, foundation trenches, oversite and damp-proof course, drainage before backfill, structural steels and joists before they are covered, insulation and fire-stopping before plastering, then completion. We book each one and hand you the completion certificate at the end of the job.

Anderson's advice: put the rooflights over the island

Rooflights over kitchen islands transform natural light more than any other single design decision. We position them on the plan before the kitchen layout is fixed, not after.

What our clients say

“We have used Lccl in the past for our rear house extension and have come back to instruct Lccl for our loft conversion too to our house in North London. As before we are very happy with the services from Lccl and we highly recommend their design and construction services for both home extension or loft conversion including both design and build services.”

— Mia M, Google Reviews

As LABC Building Excellence Award winners in 2024 (Best Residential Extension in London) and 2026 (Best Conversion or Alteration to an Existing Home, Weech Road NW6), every project is delivered by one team of architects, structural engineers, project managers and builders. Workmanship is guaranteed for 12 months from practical completion, with a 10-year LABC structural warranty.

Nearby areas

Ealing is part of our West London guide. Nearby areas: Chiswick.

To book a free consultation call LCCL Construction on 020 8037 7332 or get an instant estimate online. Get an instant estimate or book a free consultation.

One team, one contract, one point of contact — from first sketch to handover.