From £10,216
MJO CONSTRUCTION LIMITED are here to help customers who need an Extension Builder in Northolt. We offer a competitive rate to complete all your ext...
From £9,952
Northolt Harrow, UB5
Need to find an Extension Builder near you for all your extension buildering work?
HWB Construction Ltd provides a local, trusted extension...
From £10,000
Vital Builders are here to help customers who need an Extension Builder in Northolt. We offer a competitive rate to complete all your extension bui...
From £10,528
Platinum Pearl Construction Ltd originated as a small general building services company over 10 years ago and have now grown into the multi-faceted...
From £10,424
Trusted and professional extension builder in Northolt. Experienced in all extension buildering work and keeping within budget and on quote. PRIME ...
From £10,384
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £10,216
Our team of professional builders, provide complete renovation services to private and business clients within North, north-west London and surrou...
From £10,048
EXTEND.HOUSE is a trusted extension builder serving customers in Northolt and the surrounding area. Contact us to today to get a competitive quote ...
From £10,064
We focus mainly on major reconstructions of basements, lofts, extensions as well as new-build. We work with architects, construction site inspector...

Outbuilding costs in Northolt range from the cheapest of £9,584 (TTM Improve Homes based in UB5) to the dearest of £10,528 (Platinum Pearl Construction Ltd based in UB6), 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
| Borough in London |
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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 - £17,642

Two storey extension - £88,212

Build a timber frame extension - £26,142

Build a swimming pool - £81,142

Single storey extension - £57,832

Side return extension - £43,093

Install an RSJ - £2,342

Outbuilding - £10,142

Build a Mansard loft conversion - £52,142

Loft conversion - £35,078

Build a kitchen extension - £42,142

Hip to gable loft conversion - £42,142

Granny annexe - £87,142

Garden office - £10,142

Convert a Garage - £16,142

Garage - £18,642

Build a flat roof extension - £22,142

Build a dormer loft conversion - £42,142

Concrete foundations - £6,392

Convert a bungalow loft - £29,142

Convert a basement - £39,093