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Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
Jay Reid
CK Constructions & Development Ltd is a trusted extension builder serving customers in WC2H and the surrounding area. Contact us to today to get a ...
A to Z Builders Ltd are here to help customers who need an Extension Builder in WC2H. We offer a competitive rate to complete all your extension bu...
JK Doors is a trusted extension builder serving customers in WC2H and the surrounding area. Contact us to today to get a competitive quote for exte...
JM Building Services is a trusted extension builder serving customers in WC2H and the surrounding area. Contact us to today to get a competitive qu...
Buildwiser is a trusted extension builder serving customers in WC2H and the surrounding area. Contact us to today to get a competitive quote for ex...
F & F Building Services is an established extension buildering business in WC2H. We come highly recommended and provide competitive quotes for your...
Anthony Sullivan
We build Lofts. We build Extensions. We undertake conversions. Our Terms and conditions apply as shown in our starter packs.
From £39,210
Plansing Ltd
Experience the best architectural design services with PLANSING, where we flawlessly integrate innovative architectural designer products to bring ...

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 WC2H by posting a job with HaMuch and we will send it to extension builders in WC2H.
"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 - £18,041

Two storey extension - £88,811

Build a timber frame extension - £26,541

Build a swimming pool - £81,541

Single storey extension - £65,816

Side return extension - £47,584

Install an RSJ - £2,741

Outbuilding - £10,541

Build a Mansard loft conversion - £52,541

Loft conversion - £38,820

Build a kitchen extension - £42,541

Hip to gable loft conversion - £42,541

Granny annexe - £87,541

Garden office - £10,541

Convert a Garage - £16,541

Garage - £19,041

Build a flat roof extension - £22,541

Build a dormer loft conversion - £42,541

Concrete foundations - £6,791

Convert a bungalow loft - £29,541

Convert a basement - £43,584