From £18,548
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in GU21. No obligation free quotes...
From £19,004
At Ferdas Design & Build Ltd we have been fitting bespoke bathrooms since 2013. We pride ourselves on being the go-to bathroom fitters for discerni...
From £18,812
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £18,836
Aerea is a trusted extension builder serving customers in GU21 and the surrounding area. Contact us to today to get a competitive quote for extensi...
From £18,780
Member since August 2026
Relax... you have found a reliable extension builder in GU21. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in GU21 who co...
From £18,692
Need an Extension Builder in GU21? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many year...
From £18,780
Trusted and professional extension builder in GU21. Experienced in all extension buildering work and keeping within budget and on quote. DC Build &...
From £18,932
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 £18,804
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 £18,924
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Builders charge between £18,548 (J&J Building Solutions based in SW16) and £19,004 (Ferdas Design & Build Ltd based in W3) in GU21 to build a garage, but these costs are only estimates.
Comparing extension builders estimates for building a garage gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get real quotes to build a new garage in GU21 by posting a job with HaMuch and we will send it to extension builders in GU21.
"Garage" - KT15, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Garage near Woking | £43 | £277 |
| Garage near New Haw | £43 | £273 |
| Garage near Guildford | £53 | £298 |
| Garage near Ascot | £41 | £276 |
| Garage near Camberley | £41 | £283 |
| Garage near Ash Vale | £41 | £277 |
| Garage near Egham | £42 | £266 |
| Garage near Farnborough | £41 | £273 |
| Garage near Staines-upon-Thames | £42 | £269 |
| Garage near Walton-on-Thames | £43 | £277 |
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 - £17,811

Two storey extension - £88,467

Build a timber frame extension - £26,311

Build a swimming pool - £81,311

Single storey extension - £61,224

Side return extension - £45,001

Install an RSJ - £2,511

Outbuilding - £10,311

Build a Mansard loft conversion - £52,311

Loft conversion - £36,668

Build a kitchen extension - £42,311

Hip to gable loft conversion - £42,311

Granny annexe - £87,311

Garden office - £10,311

Convert a Garage - £16,311

Garage - £18,811

Build a flat roof extension - £22,311

Build a dormer loft conversion - £42,311

Concrete foundations - £6,561

Convert a bungalow loft - £29,311

Convert a basement - £41,001