From £55,960
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in TW14. No obligation free quotes...
1 review
From £58,840
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 £55,480
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
From £61,240
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £62,840
Need an Extension Builder in TW14? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...
From £60,600
Member since August 2026
Relax... you have found a reliable extension builder in TW14. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in TW14 who co...
From £58,840
Need an Extension Builder in TW14? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many year...
From £60,600
Trusted and professional extension builder in TW14. Experienced in all extension buildering work and keeping within budget and on quote. DC Build &...
From £63,640
DP Services is a fully insured friendly local company which has been trading since 2002 and delivers high quality building work in domestic extensi...
From £58,040
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...

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 - £17,730

Two storey extension - £88,346

Build a timber frame extension - £26,230

Build a swimming pool - £81,230

Single storey extension - £59,608

Side return extension - £44,092

Install an RSJ - £2,430

Outbuilding - £10,230

Build a Mansard loft conversion - £52,230

Loft conversion - £35,910

Build a kitchen extension - £42,230

Hip to gable loft conversion - £42,230

Granny annexe - £87,230

Garden office - £10,230

Convert a Garage - £16,230

Garage - £18,730

Build a flat roof extension - £22,230

Build a dormer loft conversion - £42,230

Concrete foundations - £6,480

Convert a bungalow loft - £29,230

Convert a basement - £40,092