From £17,876
Russell Square, WC1N
CK Constructions & Development Ltd is a trusted extension builder serving customers in WC1N and the surrounding area. Contact us to today to get a ...
From £17,900
FLAVIA CONDE is an established and experienced local extension builder in WC1N. Please contact us for a free, no obligation quote and competitive r...
From £17,684
Greater London, WC1N
Need to find an Extension Builder near you for all your extension buildering work?
Pacho Build Ltd provides a local, trusted extension buil...
From £17,972
Longland Construction LTD is a high end refurbishment contractor and sub contractor company in London and surrounding areas. Woodwork, painting and...
From £17,444
London, WC1N
Relax... you have found a reliable extension builder in WC1N. Otto & Mensah Build is a friendly and reliable company based in WC1N who consider no ...
From £17,516
TipTop Joinery & Build is a trusted extension builder serving customers in WC1N and the surrounding area. Contact us to today to get a competitive ...
From £17,540
JM Building Services is a trusted extension builder serving customers in WC1N and the surrounding area. Contact us to today to get a competitive qu...
From £18,004
CityGate Homes specialises in full refurbishment projects and interior design services. We offer fully integrated services spanning the entire scop...
From £19,564
We build Lofts. We build Extensions. We undertake conversions. Our Terms and conditions apply as shown in our starter packs.
From £17,644
House Rendering Ltd is a trusted extension builder serving customers in WC1N and the surrounding area. Contact us to today to get a competitive quo...

Underpinning ranges from £17,444 (Otto & Mensah Build based in WC1N) to £19,564 (Q Lofts and Extensions based in EC1R), 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 WC1N by posting a job with HaMuch and we will send it to extension builders in WC1N.
"Underpin a building" - N7, job posted 01/01/70
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 - £17,914

Two storey extension - £88,622

Build a timber frame extension - £26,414

Build a swimming pool - £81,414

Single storey extension - £63,288

Side return extension - £46,162

Install an RSJ - £2,614

Outbuilding - £10,414

Build a Mansard loft conversion - £52,414

Loft conversion - £37,635

Build a kitchen extension - £42,414

Hip to gable loft conversion - £42,414

Granny annexe - £87,414

Garden office - £10,414

Convert a Garage - £16,414

Garage - £18,914

Build a flat roof extension - £22,414

Build a dormer loft conversion - £42,414

Concrete foundations - £6,664

Convert a bungalow loft - £29,414

Convert a basement - £42,162