From £38,040
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in TW12. No obligation free quotes...
1 review
From £39,660
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
From £37,770
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
From £41,010
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £41,910
Need an Extension Builder in TW12? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...
From £39,660
Need an Extension Builder in TW12? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many year...
From £40,650
Trusted and professional extension builder in TW12. Experienced in all extension buildering work and keeping within budget and on quote. DC Build &...
From £39,210
I am a qualified, builder, electrician and plumber. I have been working in the construction industry for over 23 years and have built everything fr...
From £40,920
Hi we have 15 years of experience in building and construction industry our specialization is bathrooms and renovations please have a look at the w...
From £49,020
Buci builders ltd is a trusted extension builder serving customers in TW12 and the surrounding area. Contact us to today to get a competitive quote...

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 TW12 by posting a job with HaMuch and we will send it to extension builders in TW12.
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 - £17,792

Two storey extension - £88,438

Build a timber frame extension - £26,292

Build a swimming pool - £81,292

Single storey extension - £60,840

Side return extension - £44,785

Install an RSJ - £2,492

Outbuilding - £10,292

Build a Mansard loft conversion - £52,292

Loft conversion - £36,488

Build a kitchen extension - £42,292

Hip to gable loft conversion - £42,292

Granny annexe - £87,292

Garden office - £10,292

Convert a Garage - £16,292

Garage - £18,792

Build a flat roof extension - £22,292

Build a dormer loft conversion - £42,292

Concrete foundations - £6,542

Convert a bungalow loft - £29,292

Convert a basement - £40,785