From £16,048
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in TW13. No obligation free quotes...
1 review
From £16,192
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 £16,024
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
From £16,312
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £16,392
Need an Extension Builder in TW13? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...
From £16,280
Member since August 2026
Relax... you have found a reliable extension builder in TW13. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in TW13 who co...
From £16,192
Need an Extension Builder in TW13? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many year...
From £16,280
Trusted and professional extension builder in TW13. Experienced in all extension buildering work and keeping within budget and on quote. DC Build &...
From £16,152
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 £16,304
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...

Garage conversions in TW13 typically range from £16,024 (SH Enterprise based in EC1V) to £16,392 (Samuele Paolini based in NW2), but the only way to get an accurate cost for your specific project is to get quotes.
Post a job with HaMuch and we'll send it to extension builders in TW13 who will be happy to help.
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 - £17,718

Two storey extension - £88,326

Build a timber frame extension - £26,218

Build a swimming pool - £81,218

Single storey extension - £59,352

Side return extension - £43,948

Install an RSJ - £2,418

Outbuilding - £10,218

Build a Mansard loft conversion - £52,218

Loft conversion - £35,790

Build a kitchen extension - £42,218

Hip to gable loft conversion - £42,218

Granny annexe - £87,218

Garden office - £10,218

Convert a Garage - £16,218

Garage - £18,718

Build a flat roof extension - £22,218

Build a dormer loft conversion - £42,218

Concrete foundations - £6,468

Convert a bungalow loft - £29,218

Convert a basement - £39,948