From £87,048
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in UB10. No obligation free quotes...
From £87,504
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...
1 review
From £87,192
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 £87,024
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
From £87,312
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,392
Need an Extension Builder in UB10? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...
From £87,280
Member since August 2026
Relax... you have found a reliable extension builder in UB10. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in UB10 who co...
From £87,192
Need an Extension Builder in UB10? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many year...
From £87,280
Trusted and professional extension builder in UB10. Experienced in all extension buildering work and keeping within budget and on quote. DC Build &...
From £87,432
DP Services is a fully insured friendly local company which has been trading since 2002 and delivers high quality building work in domestic extensi...

Building a granny annexe ranges from £87,024 (SH Enterprise based in EC1V) to £87,504 (Ferdas Design & Build Ltd based in W3), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in UB10 by posting a job with HaMuch. We will send it to extension builders in UB10 who will be happy to help you.
| Borough in London |
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| Granny Annexe in Hillingdon |
| Granny Annexe in Uxbridge |
| Granny Annexe in Stockley Park |
| Granny Annexe in Ruislip |
| Granny Annexe in Yeading |
| Granny Annexe in Denham |
| Granny Annexe in West Drayton |
| Granny Annexe in Iver |
| Granny Annexe in Hayes |
| Granny Annexe in Northolt |
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 - £17,766

Two storey extension - £88,398

Build a timber frame extension - £26,266

Build a swimming pool - £81,266

Single storey extension - £60,312

Side return extension - £44,488

Install an RSJ - £2,466

Outbuilding - £10,266

Build a Mansard loft conversion - £52,266

Loft conversion - £36,240

Build a kitchen extension - £42,266

Hip to gable loft conversion - £42,266

Granny annexe - £87,266

Garden office - £10,266

Convert a Garage - £16,266

Garage - £18,766

Build a flat roof extension - £22,266

Build a dormer loft conversion - £42,266

Concrete foundations - £6,516

Convert a bungalow loft - £29,266

Convert a basement - £40,488