Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Relax... you have found a reliable extension builder in W2. M & A UK Ltd is a friendly and reliable company based in W2 who consider no job as too ...
Jay Reid
JK Doors is a trusted extension builder serving customers in W2 and the surrounding area. Contact us to today to get a competitive quote for extens...
Hussein Eljhani
We are highly professional Builders Company, hones pricing and reliable, we leave all areas clean and tidy.
Trusted and professional extension builder in W2. Experienced in all extension buildering work and keeping within budget and on quote. ASE Design &...
TELEMARK CONSTRUCTION LTD is a trusted extension builder serving customers in W2 and the surrounding area. Contact us to today to get a competitive...
Need to find an Extension Builder near you for all your extension buildering work?
EUROBUILD PROPERTIES CO LTD provides a local, trusted ex...
From £17,732
Pro Fast Build Ltd. is a well established building company specialising in all areas of building work – interior and exterior. We are the best ch...
From £17,732
Trusted and professional extension builder in W2. Experienced in all extension buildering work and keeping within budget and on quote. Hartley Limi...

Underpinning ranges from £17,428 (BPS Building based in NW6) to £19,820 (Reid and Co Developments Ltd based in NW8), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in W2 by posting a job with HaMuch and we will send it to extension builders in W2.
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,958

Two storey extension - £88,686

Build a timber frame extension - £26,458

Build a swimming pool - £81,458

Single storey extension - £64,152

Side return extension - £46,648

Install an RSJ - £2,658

Outbuilding - £10,458

Build a Mansard loft conversion - £52,458

Loft conversion - £38,040

Build a kitchen extension - £42,458

Hip to gable loft conversion - £42,458

Granny annexe - £87,458

Garden office - £10,458

Convert a Garage - £16,458

Garage - £18,958

Build a flat roof extension - £22,458

Build a dormer loft conversion - £42,458

Concrete foundations - £6,708

Convert a bungalow loft - £29,458

Convert a basement - £42,648