From £37,680
TipTop Joinery & Build is a trusted extension builder serving customers in High Holborn and the surrounding area. Contact us to today to get a comp...
From £39,120
House Rendering Ltd is a trusted extension builder serving customers in High Holborn and the surrounding area. Contact us to today to get a competi...
From £40,200
Relax... you have found a reliable extension builder in High Holborn. HouseUP is a friendly and reliable company based in High Holborn who consider...
From £39,750
Experienced extension builder ready to quote for your work. My Trusted Builder is the best extension builder in High Holborn. No obligation free qu...
From £37,770
Need to find an Extension Builder near you for all your extension buildering work?
ORO Projects provides a local, trusted extension builder...
From £40,560
Trusted and professional extension builder in High Holborn. Experienced in all extension buildering work and keeping within budget and on quote. El...
From £38,400
Whitehorse Build London offers a full management service running each project from design through to completion, removing many of the hassle associ...
From £38,580
We offer many services in both residential and commercial settings including:BathroomsBuilding & RenovationDecking & PavingDemolitionDoor Installat...
From £41,910
Matstone Projects Limited is an established extension buildering business in High Holborn. We come highly recommended and provide competitive quote...
From £37,950
Rucco Property is a trusted extension builder serving customers in High Holborn and the surrounding area. Contact us to today to get a 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 High Holborn by posting a job with HaMuch and we will send it to extension builders in High Holborn.
"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 - £17,650

Two storey extension - £88,226

Build a timber frame extension - £26,150

Build a swimming pool - £81,150

Single storey extension - £58,008

Side return extension - £43,192

Install an RSJ - £2,350

Outbuilding - £10,150

Build a Mansard loft conversion - £52,150

Loft conversion - £35,160

Build a kitchen extension - £42,150

Hip to gable loft conversion - £42,150

Granny annexe - £87,150

Garden office - £10,150

Convert a Garage - £16,150

Garage - £18,650

Build a flat roof extension - £22,150

Build a dormer loft conversion - £42,150

Concrete foundations - £6,400

Convert a bungalow loft - £29,150

Convert a basement - £39,192