House extensions & lofts in Chiswick W4
From Bedford Park's protected Queen Anne houses to Victorian terraces off the High Road, Chiswick rewards careful extension design — matched brick, considered rooflines, planning handled for you. One in-house team takes W4 projects from drawings to handover.
- Postcode W4
- Borough Hammersmith and Fulham
- Service Design & build
- Free quote 2 min online
What we deliver in Chiswick
Every street sits differently — a period terrace, a post-war semi, a modern infill. We shape the recommendation around your actual house, its planning context and how you want to live.
Side-return and full-width rear extensions are the staple here — turning narrow Victorian kitchens into open-plan family space. We design them sympathetically and handle any conservation-area consent end-to-end.
Loft conversions add bedrooms and en-suites to Chiswick's terraces and semis without extending the footprint — ideal where the garden is precious or planning is sensitive.
New-builds are uncommon in Chiswick's protected streets, but we take on backland and replacement-dwelling projects where the plot allows.
SERVICE 01 House extensions in Chiswick
Single-storey, double-storey, side-return and wrap-around extensions — designed, planned and built by one in-house team.
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SERVICE 02 Loft conversions in Chiswick
Dormer, mansard, hip-to-gable and L-shape lofts — full-height ceilings, proper staircases, en-suites.
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SERVICE 03 New builds in Chiswick
Ground-up homes on infill plots, demolition-and-rebuild, and small multi-unit schemes.
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Common Chiswick questions
Things you might need to know about building in Chiswick.
Do I need planning permission for an extension in Chiswick?
Many extensions in Chiswick fall under permitted development. Where a full application is needed, it goes to Hounslow Council — we assess your property type, the council's restrictions and any conservation status on the first visit, and handle the application ourselves.
How long does a project in Chiswick typically take?
From first consultation to handover: 6–9 months for a single-storey extension or loft, 9–14 months for double-storey or wrap-around. We give you a tighter estimate after the survey.
Are there conservation areas in Chiswick?
Several streets in Hounslow Council's area fall within conservation areas that restrict materials and detailing. We check your exact address against the register on the first visit, and we have approved schemes in conservation areas nearby.
What is a typical extension cost in Chiswick?
Build cost in this part of London runs £2,500–£4,000 per square metre for a finished extension including kitchen and finishes. Our calculator gives a personalised estimate.
Other Hammersmith and Fulham neighbourhoods
We deliver projects across the borough — same team, same pricing, same fixed-price contract.
Ready to start your Chiswick project?
Get an instant estimate in 2 minutes — no callbacks, no commitment. Or talk to a real person on 0800 0432 333.