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 Northolt. Experienced in all extension buildering work and keeping within budget and on quote. DC Bui...
Hardeep Samra
MJ Builders (London) Ltd are here to help customers who need an Extension Builder in Northolt. We offer a competitive rate to complete all your ext...
Bill Matharu
Matharu Buildings is an established extension buildering business in Northolt. We come highly recommended and provide competitive quotes for your w...
UK Food
Need to find an Extension Builder near you for all your extension buildering work?
Mamma V's Caribbean and English Cuisine provides a local...
Experienced extension builder ready to quote for your work. DIAL 1ST CONSTRUCTION LTD is the best extension builder in Northolt. No obligation free...
Need an Extension Builder in Northolt? Ava Constructions & Decors Ltd has been helping local clients (10 mile radius) with their extension builderi...
Gallant Contractors have partnered with Homeowners, Designers and Architects to deliver unrivalled construction, renovation, double glazing and ref...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Need an Extension Builder in Northolt? S.K Singh has been helping local clients (10 mile radius) with their extension buildering jobs for many year...

Outbuilding costs in Northolt range from the cheapest of £9,944 (Ava Constructions & Decors Ltd based in UB3) to the dearest of £10,312 (T M Builder based in UB4), 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 Northolt by posting a job with HaMuch and we will send it to extension builders.
"Outbuilding" - HA4, job posted 03/11/25
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| Outbuilding in Northolt |
| Outbuilding in Greenford |
| Outbuilding in Yeading |
| Outbuilding in Southall |
| Outbuilding in Rayners Lane |
| Outbuilding in Ruislip |
| Outbuilding in Hanwell |
| Outbuilding in Harrow |
| Outbuilding in Southall |
| Outbuilding in Sudbury |
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 - £17,675

Two storey extension - £88,263

Build a timber frame extension - £26,175

Build a swimming pool - £81,175

Single storey extension - £58,504

Side return extension - £43,471

Install an RSJ - £2,375

Outbuilding - £10,175

Build a Mansard loft conversion - £52,175

Loft conversion - £35,393

Build a kitchen extension - £42,175

Hip to gable loft conversion - £42,175

Granny annexe - £87,175

Garden office - £10,175

Convert a Garage - £16,175

Garage - £18,675

Build a flat roof extension - £22,175

Build a dormer loft conversion - £42,175

Concrete foundations - £6,425

Convert a bungalow loft - £29,175

Convert a basement - £39,471