From £10,048
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 £10,192
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 £10,024
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
From £10,312
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £10,392
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 £10,280
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 £10,192
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 £10,280
Trusted and professional extension builder in TW14. Experienced in all extension buildering work and keeping within budget and on quote. DC Build &...
From £10,432
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 £10,152
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...

Outbuilding costs in TW14 range from the cheapest of £10,024 (SH Enterprise based in EC1V) to the dearest of £10,432 (DP Services based in RG41), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in TW14 by posting a job with HaMuch and we will send it to extension builders.
| Borough in London |
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| Outbuilding in Hatton |
| Outbuilding in Faltham |
| Outbuilding in Heathrow |
| Outbuilding in Whitton |
| Outbuilding in Ashford |
| Outbuilding in Heston |
| Outbuilding in Sunbury-on-Thames |
| Outbuilding in Hounslow |
| Outbuilding in Hampton |
| Outbuilding in Strawberry Hill |
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