Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in W1W. No obligation free quotes ...
Samuele Paolini
Need an Extension Builder in W1W? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
Erald Kanani
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Torrington Design
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
Vasi J
No Call out charges!
All Jobs Fully Insured and Guaranteed !!!
All aspects of Plumbing, Heating and Drains....
..."I am very pleased with the work carried out. All very clear and transparent." - ROMFORD,reviewed 10/01/18, KELLY
PW Construction & Renovation Ltd is a trusted extension builder serving customers in W1W and the surrounding area. Contact us to today to get a com...
Robert Buci
Buci builders ltd is a trusted extension builder serving customers in W1W and the surrounding area. Contact us to today to get a competitive quote ...
Experienced extension builder ready to quote for your work. The Perfectionist is the best extension builder in W1W. No obligation free quotes and m...
Gani Bush
Gb construction are here to help customers who need an Extension Builder in W1W. We offer a competitive rate to complete all your extension builde...

In W1W, prices for dormer loft conversions range from £41,880 (Can design and Construction based in Ig11) to £43,024 (Buci builders ltd based in SE27), but how much your conversion costs will vary depending on the size of your property, how easy access to your roof is and what you want to use the space for.
The best way to get an accurate price is to compare quotes from extension builders in W1W. Post your job on HaMuch now and we'll put you in touch with available extension builders.
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 - £17,698

Two storey extension - £88,298

Build a timber frame extension - £26,198

Build a swimming pool - £81,198

Single storey extension - £58,968

Side return extension - £43,732

Install an RSJ - £2,398

Outbuilding - £10,198

Build a Mansard loft conversion - £52,198

Loft conversion - £35,610

Build a kitchen extension - £42,198

Hip to gable loft conversion - £42,198

Granny annexe - £87,198

Garden office - £10,198

Convert a Garage - £16,198

Garage - £18,698

Build a flat roof extension - £22,198

Build a dormer loft conversion - £42,198

Concrete foundations - £6,448

Convert a bungalow loft - £29,198

Convert a basement - £39,732