From £17,564
Kings Langley, WD4
Trusted and professional extension builder in WD4. Experienced in all extension buildering work and keeping within budget and on quote. Total Refur...
From £17,916
M DUNNE BUILDER is a trusted extension builder serving customers in WD4 and the surrounding area. Contact us to today to get a competitive quote fo...
From £17,588
Need an Extension Builder in WD4? PM HOBBS BUILDING SERVICES has been helping local clients (10 mile radius) with their extension buildering jobs f...
From £17,940
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,516
King, WD4
Trusted and professional extension builder in WD4. Experienced in all extension buildering work and keeping within budget and on quote. All Weather...
From £17,940
Need to find an Extension Builder near you for all your extension buildering work?
Rob Higgs Building & Carpentry provides a local, trusted...
From £17,636
Experienced extension builder ready to quote for your work. SWAT Design and Build Ltd is the best extension builder in WD4. No obligation free quot...
From £17,636
Experienced extension builder ready to quote for your work. Building & Renovation Services Zdzislaw Zalewski is the best extension builder in WD4. ...
From £17,636
Experienced extension builder ready to quote for your work. Murati Building LTD is the best extension builder in WD4. No obligation free quotes and...
From £17,652
JH Refurbishments are here to help customers who need an Extension Builder in WD4. We offer a competitive rate to complete all your extension build...

Underpinning ranges from £17,516 (All Weather Roofing (Herts) LTD based in WD4) to £17,940 (Evolved Glazing Solutions Limited based in HP3), 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 WD4 by posting a job with HaMuch and we will send it to extension builders in WD4.
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 - £17,702

Two storey extension - £88,304

Build a timber frame extension - £26,202

Build a swimming pool - £81,202

Single storey extension - £59,048

Side return extension - £43,777

Install an RSJ - £2,402

Outbuilding - £10,202

Build a Mansard loft conversion - £52,202

Loft conversion - £35,648

Build a kitchen extension - £42,202

Hip to gable loft conversion - £42,202

Granny annexe - £87,202

Garden office - £10,202

Convert a Garage - £16,202

Garage - £18,702

Build a flat roof extension - £22,202

Build a dormer loft conversion - £42,202

Concrete foundations - £6,452

Convert a bungalow loft - £29,202

Convert a basement - £39,777