From £42,270
Elephant & Castle, SE17
AAA Design Decorators are here to help customers who need an Extension Builder in SE17. We offer a competitive rate to complete all your extension ...
From £37,770
Need to find an Extension Builder near you for all your extension buildering work?
AGRI CONSTRUCTION provides a local, trusted extension bu...
From £40,830
Need an Extension Builder in SE17? GILL BUILDING CONTRACTORS has been helping local clients (5 mile radius) with their extension buildering jobs fo...
From £40,380
DUWIX BUILDING MAINTENANCE are here to help customers who need an Extension Builder in SE17. We offer a competitive rate to complete all your exten...
From £40,830
Catch-all residential & commercial property maintenance and management service including intelligent A/V installation, We've focussed on SE1 for 8 ...
From £42,990
Need an Extension Builder in SE17? Oxus Construction has been helping local clients (5 mile radius) with their extension buildering jobs for many y...
From £36,150
Trusted and professional extension builder in SE17. Experienced in all extension buildering work and keeping within budget and on quote. D & S CONS...
From £42,630
Need to find an Extension Builder near you for all your extension buildering work?
Ask Building provides a local, trusted extension builder...
From £39,480
At Home Tranformers Ltd we have been fitting bespoke bathrooms for over 10 years. We pride ourselves on being the go-to bathroom fitters for discer...
From £41,820
Propia Limited is an established and experienced local extension builder in SE17. Please contact us for a free, no obligation quote and competitive...

Comparing extension builders estimates for a Convert a basement gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost to convert a basement in SE17 by posting a job with HaMuch and we will send it to extension builders in SE17.
"Basement conversion" - LAMBETH, job posted 05/02/25
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 - £17,768

Two storey extension - £88,402

Build a timber frame extension - £26,268

Build a swimming pool - £81,268

Single storey extension - £60,360

Side return extension - £44,515

Install an RSJ - £2,468

Outbuilding - £10,268

Build a Mansard loft conversion - £52,268

Loft conversion - £36,263

Build a kitchen extension - £42,268

Hip to gable loft conversion - £42,268

Granny annexe - £87,268

Garden office - £10,268

Convert a Garage - £16,268

Garage - £18,768

Build a flat roof extension - £22,268

Build a dormer loft conversion - £42,268

Concrete foundations - £6,518

Convert a bungalow loft - £29,268

Convert a basement - £40,515