Hammersmith · W6, W12, W14
House Extensions in Hammersmith
Rear, side return, wraparound or double storey — we handle the build from foundations to final decoration, including the steel, the drainage diversion and the building control sign-off.
Most West London extensions are built on Victorian or Edwardian stock, which means party walls, shallow existing foundations and drain runs in awkward places. We dig trial holes before quoting so the price reflects what is actually under the ground rather than what we hoped was there. Structural steel is calculated by an engineer, not guessed, and we handle the Party Wall notices and building control from the start.
House Extensions in Hammersmith: what to know locally
Victorian terraces and mansion blocks, with denser housing towards Brook Green and larger stock around Ravenscourt Park.
A lot of the work here is flats and maisonettes rather than whole houses, which brings freeholder consent and leaseholder obligations into the picture alongside building control. Access and parking for materials needs planning in advance.
Planning authority: Hammersmith & Fulham Council. Hammersmith & Fulham has numerous conservation areas and a controlled parking environment. Skip permits and material deliveries need scheduling around restrictions.
What the work covers
- Foundations, underpinning and structural steel
- Party Wall notices and awards
- Drainage diversion and new soil runs
- Roofing — flat, pitched, lantern or glazed
- First and second fix electrics and plumbing
- Plastering, flooring and full decoration
What it costs
Most single-storey rear extensions in this part of London land between £2,200 and £3,000 per square metre depending on glazing, groundworks and finish. A proper site visit is the only way to price it honestly.
Other work we do in Hammersmith
House Extensions nearby
House Extensions in Hammersmith — questions
Do you cover Hammersmith?
Yes — Hammersmith and the W6, W12, W14 postcodes are part of our core working area, along with Chiswick, Shepherd's Bush, Acton. Being local means a site visit within days rather than weeks.
Which council handles planning for Hammersmith?
Hammersmith & Fulham Council. Hammersmith & Fulham has numerous conservation areas and a controlled parking environment. Skip permits and material deliveries need scheduling around restrictions.
Do I need planning permission for an extension?
Many single-storey rear extensions fall under permitted development, but limits differ for terraced, semi-detached and detached homes, and permitted development rights are often removed in conservation areas. We check the specific property against the local authority's records before quoting.
How long does an extension take?
A straightforward single-storey rear extension is usually 10 to 14 weeks on site. Double storey or anything involving underpinning runs longer. The written quote carries a programme with dates, not a vague estimate.
Will I need a Party Wall agreement?
If you are building on or next to the boundary with a neighbour, or excavating within three metres of their foundations, then yes. We serve the notices and manage the process — it needs two months' lead time, so we start it early.
House Extensions in Hammersmith?
Tell us about the property and what you have in mind. We will come out, measure it properly, and put a written itemised quote in front of you.
We reply to every quote request within 24 hours.