From £22,048
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 £22,192
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 £22,024
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
From £22,312
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £22,392
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 £22,192
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 £22,280
Trusted and professional extension builder in TW12. Experienced in all extension buildering work and keeping within budget and on quote. DC Build &...
From £22,152
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 £22,304
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 £23,024
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...

A flat roof extension ranges from the cheapest of £22,024 (SH Enterprise based in EC1V) to the dearest of £23,024 (Buci builders ltd based in SE27), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in TW12 by posting a job with HaMuch. We'll 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