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Need to find an Extension Builder near you for all your extension buildering work?
OAK HOUSE BESPOKE BUILDERS provides a local, trusted ext...
Jatinder Kahlon
Hi, I’m Jatinder. I’m a qualified electrician and gas safe registered professional with 10 years of experience in the trade. We specialise in l...
Need to find an Extension Builder near you for all your extension buildering work?
Slick Construction Ltd provides a local, trusted extensi...
From 2007 – 2015 David Rudelhoff (Founder and Director) was the Property Manager for a high profile, high net worth family. During that time, in ...
Lead by designer Richard Gordon, GDC is a London and Berkshire based Design & Build firm with a vast amount of experience in both the residential a...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Trusted and professional extension builder in Sunbury-on-thames. Experienced in all extension buildering work and keeping within budget and on quot...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Image Design & Consultants is a trusted extension builder serving customers in Sunbury-on-thames and the surrounding area. Contact us to today to g...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Outbuilding costs in Sunbury-on-thames range from the cheapest of £9,896 (Tota Builders based in TW2) to the dearest of £10,800 (OAK HOUSE BESPOKE BUILDERS based in KT9), 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 Sunbury-on-thames by posting a job with HaMuch and we will send it to extension builders.
"Erection of new 7mx4m Outbuilding in back Garden for use as Gym/Office" - TW15, job posted 01/01/70
"Outbuilding" - STAINES-UPON-THAMES, job posted 08/06/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near Sunbury-on-Thames | £43 | £273 |
| Outbuilding near West Molesey | £43 | £274 |
| Outbuilding near Walton-on-Thames | £43 | £277 |
| Outbuilding near Elmbridge | £44 | £278 |
| Outbuilding near Richmond Upon Thames | £43 | £274 |
| Outbuilding near Esher | £43 | £274 |
| Outbuilding near Hounslow | £43 | £272 |
| Outbuilding near Staines-upon-Thames | £42 | £269 |
| Outbuilding near New Haw | £43 | £273 |
| Outbuilding near Kingston Upon Thames | £43 | £271 |
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 - £17,821

Two storey extension - £88,481

Build a timber frame extension - £26,321

Build a swimming pool - £81,321

Single storey extension - £61,416

Side return extension - £45,109

Install an RSJ - £2,521

Outbuilding - £10,321

Build a Mansard loft conversion - £52,321

Loft conversion - £36,758

Build a kitchen extension - £42,321

Hip to gable loft conversion - £42,321

Granny annexe - £87,321

Garden office - £10,321

Convert a Garage - £16,321

Garage - £18,821

Build a flat roof extension - £22,321

Build a dormer loft conversion - £42,321

Concrete foundations - £6,571

Convert a bungalow loft - £29,321

Convert a basement - £41,109