From £37,050
Trusted and professional extension builder in Harrow. Experienced in all extension buildering work and keeping within budget and on quote. TAAJ Con...
From £39,030
Harrow Greater London, HA1
Taaj empowers homeowners to bring out their own personality and creativity in the space they live in by bringing transparency, attention to detail ...
From £40,470
G. Building Services Ltd is a trusted extension builder serving customers in Harrow and the surrounding area. Contact us to today to get a competit...
From £40,020
Harrow, HA1
DS Build & Design are here to help customers who need an Extension Builder in Harrow. We offer a competitive rate to complete all your extension bu...
From £42,990
We pride ourselves on going that extra mile to ensure our jobs stand out from the rest. We work closely with our clients to carefully understand th...
From £42,900
Harrow, HA1
Trusted and professional extension builder in Harrow. Experienced in all extension buildering work and keeping within budget and on quote. K Mccorm...
From £38,760
JJSR Construction Ltd is an established and experienced local extension builder in Harrow. Please contact us for a free, no obligation quote and co...
From £37,950
Harrow Greater London, HA1
Relax... you have found a reliable extension builder in Harrow. Prospective Builders Ltd is a friendly and reliable company based in Harrow who con...
From £41,460
Experienced extension builder ready to quote for your work. F&V CONSTRUCTION LTD is the best extension builder in Harrow. No obligation free quotes...
From £42,090
Experienced extension builder ready to quote for your work. BUILDING SERVICES (UK) LTD is the best extension builder in Harrow. No obligation free ...

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 Harrow by posting a job with HaMuch and we will send it to extension builders in Harrow.
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 - £17,746

Two storey extension - £88,370

Build a timber frame extension - £26,246

Build a swimming pool - £81,246

Single storey extension - £59,928

Side return extension - £44,272

Install an RSJ - £2,446

Outbuilding - £10,246

Build a Mansard loft conversion - £52,246

Loft conversion - £36,060

Build a kitchen extension - £42,246

Hip to gable loft conversion - £42,246

Granny annexe - £87,246

Garden office - £10,246

Convert a Garage - £16,246

Garage - £18,746

Build a flat roof extension - £22,246

Build a dormer loft conversion - £42,246

Concrete foundations - £6,496

Convert a bungalow loft - £29,246

Convert a basement - £40,272