From £62,520
CK Constructions & Development Ltd is a trusted extension builder serving customers in WC1B and the surrounding area. Contact us to today to get a ...
From £63,000
FLAVIA CONDE is an established and experienced local extension builder in WC1B. Please contact us for a free, no obligation quote and competitive r...
From £58,680
Need to find an Extension Builder near you for all your extension buildering work?
Pacho Build Ltd provides a local, trusted extension buil...
From £64,440
Longland Construction LTD is a high end refurbishment contractor and sub contractor company in London and surrounding areas. Woodwork, painting and...
From £57,880
House Rendering Ltd is a trusted extension builder serving customers in WC1B and the surrounding area. Contact us to today to get a competitive quo...
From £59,800
Relax... you have found a reliable extension builder in WC1B. HouseUP is a friendly and reliable company based in WC1B who consider no job as too b...
From £59,000
Experienced extension builder ready to quote for your work. My Trusted Builder is the best extension builder in WC1B. No obligation free quotes and...
From £55,480
Need to find an Extension Builder near you for all your extension buildering work?
ORO Projects provides a local, trusted extension builder...
From £60,440
Trusted and professional extension builder in WC1B. Experienced in all extension buildering work and keeping within budget and on quote. ElleHaus h...
From £56,600
Whitehorse Build London offers a full management service running each project from design through to completion, removing many of the hassle associ...

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 - £17,739

Two storey extension - £88,359

Build a timber frame extension - £26,239

Build a swimming pool - £81,239

Single storey extension - £59,784

Side return extension - £44,191

Install an RSJ - £2,439

Outbuilding - £10,239

Build a Mansard loft conversion - £52,239

Loft conversion - £35,993

Build a kitchen extension - £42,239

Hip to gable loft conversion - £42,239

Granny annexe - £87,239

Garden office - £10,239

Convert a Garage - £16,239

Garage - £18,739

Build a flat roof extension - £22,239

Build a dormer loft conversion - £42,239

Concrete foundations - £6,489

Convert a bungalow loft - £29,239

Convert a basement - £40,191