From £17,796
Bermondsey, SE1
Need an Extension Builder in SE1? GILL BUILDING CONTRACTORS has been helping local clients (5 mile radius) with their extension buildering jobs for...
From £17,492
Stanrock Building Services Ltd is a trusted extension builder serving customers in SE1 and the surrounding area. Contact us to today to get a compe...
From £18,004
Greater London, SE1
Combining a creative and professional approach with extensive industry experience. We offer full service packages - from high end refurbishments, t...
From £17,620
Our interior design service helps people to live better through interior architecture that solves problems, anticipates their needs and creates a h...
From £17,796
Greater London, SE1
Catch-all residential & commercial property maintenance and management service including intelligent A/V installation, We've focussed on SE1 for 8 ...
From £17,380
Trusted and professional extension builder in SE1. Experienced in all extension buildering work and keeping within budget and on quote. D & S CONST...
From £17,700
Greater London, SE1
Experienced extension builder ready to quote for your work. Space Design Construction Services Ltd is the best extension builder in SE1. No obligat...
From £17,524
Need to find an Extension Builder near you for all your extension buildering work?
AGRI CONSTRUCTION provides a local, trusted extension bu...
From £17,924
AAA Design Decorators are here to help customers who need an Extension Builder in SE1. We offer a competitive rate to complete all your extension b...
From £17,884
Propia Limited is an established and experienced local extension builder in SE1. Please contact us for a free, no obligation quote and competitive ...

Underpinning ranges from £17,380 (D & S CONSTRUCTION LTD based in SE1) to £18,004 (Stanrock Building Services Ltd based in se1), 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 SE1 by posting a job with HaMuch and we will send it to extension builders in SE1.
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 - £17,712

Two storey extension - £88,318

Build a timber frame extension - £26,212

Build a swimming pool - £81,212

Single storey extension - £59,240

Side return extension - £43,885

Install an RSJ - £2,412

Outbuilding - £10,212

Build a Mansard loft conversion - £52,212

Loft conversion - £35,738

Build a kitchen extension - £42,212

Hip to gable loft conversion - £42,212

Granny annexe - £87,212

Garden office - £10,212

Convert a Garage - £16,212

Garage - £18,712

Build a flat roof extension - £22,212

Build a dormer loft conversion - £42,212

Concrete foundations - £6,462

Convert a bungalow loft - £29,212

Convert a basement - £39,885