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JK Doors is a trusted extension builder serving customers in WC1A and the surrounding area. Contact us to today to get a competitive quote for exte...
Torrington Design
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
CK Constructions & Development Ltd is a trusted extension builder serving customers in WC1A 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 WC1A. We offer a competitive rate to complete all your extension bu...
JM Building Services is a trusted extension builder serving customers in WC1A and the surrounding area. Contact us to today to get a competitive qu...
Buildwiser is a trusted extension builder serving customers in WC1A 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 WC1A. We come highly recommended and provide competitive quotes for your...
From £60,720
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 ...
From £37,950
TOP CONSTRUCTION is an established extension buildering business in WC1A. We come highly recommended and provide competitive quotes for your work.<...

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 WC1A by posting a job with HaMuch and we will send it to extension builders in WC1A.
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 - £17,830

Two storey extension - £88,494

Build a timber frame extension - £26,330

Build a swimming pool - £81,330

Single storey extension - £61,592

Side return extension - £45,208

Install an RSJ - £2,530

Outbuilding - £10,330

Build a Mansard loft conversion - £52,330

Loft conversion - £36,840

Build a kitchen extension - £42,330

Hip to gable loft conversion - £42,330

Granny annexe - £87,330

Garden office - £10,330

Convert a Garage - £16,330

Garage - £18,830

Build a flat roof extension - £22,330

Build a dormer loft conversion - £42,330

Concrete foundations - £6,580

Convert a bungalow loft - £29,330

Convert a basement - £41,208