From £17,548
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in E4. No obligation free quotes a...
From £17,548
Trusted and professional extension builder in E4. Experienced in all extension buildering work and keeping within budget and on quote. WHITE EAGLE ...
From £17,892
Need an Extension Builder in E4? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many year...
From £17,420
Masonic Plumbing and Heating Ltd are here to help customers who need an Extension Builder in E4. We offer a competitive rate to complete all your e...
From £17,692
Gb construction are here to help customers who need an Extension Builder in E4. We offer a competitive rate to complete all your extension builder...
From £17,684
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in E4. No obligation free quotes and ma...
From £17,812
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £18,060
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...
From £17,596
Experienced extension builder ready to quote for your work. Mr is the best extension builder in E4. No obligation free quotes and many happy custom...
From £17,484
JK Doors is a trusted extension builder serving customers in E4 and the surrounding area. Contact us to today to get a competitive quote for extens...

Underpinning ranges from £17,420 (Masonic Plumbing and Heating Ltd based in BR2) to £18,060 (Rafix Building based in EN4), 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 E4 by posting a job with HaMuch and we will send it to extension builders in E4.
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 - £17,674

Two storey extension - £88,260

Build a timber frame extension - £26,174

Build a swimming pool - £81,174

Single storey extension - £58,472

Side return extension - £43,453

Install an RSJ - £2,374

Outbuilding - £10,174

Build a Mansard loft conversion - £52,174

Loft conversion - £35,378

Build a kitchen extension - £42,174

Hip to gable loft conversion - £42,174

Granny annexe - £87,174

Garden office - £10,174

Convert a Garage - £16,174

Garage - £18,674

Build a flat roof extension - £22,174

Build a dormer loft conversion - £42,174

Concrete foundations - £6,424

Convert a bungalow loft - £29,174

Convert a basement - £39,453