From £87,376
Bromley, BR1
Need an Extension Builder in BR1? Saintflexs has been helping local clients (10 mile radius) with their extension buildering jobs for many years. ...
From £87,112
Pineapple Interiors is an established extension buildering business in BR1. We come highly recommended and provide competitive quotes for your work...
From £87,160
Kent, BR1
Nicholas James Construction is an established extension buildering business in BR1. We come highly recommended and provide competitive quotes for y...
From £87,160
Need to find an Extension Builder near you for all your extension buildering work?
Heritage Roofing and Building Solutions Ltd provides a l...
From £87,088
Bromley, BR1
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,376
Travel London Ltd is an established and experienced local extension builder in BR1. Please contact us for a free, no obligation quote and competiti...
From £87,296
AAB Tile Installation & Repairs are here to help customers who need an Extension Builder in BR1. We offer a competitive rate to complete all your e...
From £87,320
Relax... you have found a reliable extension builder in BR1. PROBUILD (SE) LTD is a friendly and reliable company based in BR1 who consider no job ...
From £86,456
Highly dedicated company to deliver exceptional customer service
From £87,128
Relax... you have found a reliable extension builder in BR1. Upwards and Outwards is a friendly and reliable company based in BR1 who consider no j...

Building a granny annexe ranges from £86,456 (London Quality Construction Group Limited based in BR2) to £87,376 (Saintflexs based in BR1), 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 BR1 by posting a job with HaMuch. We will send it to extension builders in BR1 who will be happy to help you.
| Borough in London |
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| Granny Annexe in Bromley |
| Granny Annexe in Keston |
| Granny Annexe in Chislehurst |
| Granny Annexe in Grove Park |
| Granny Annexe in Beckenham |
| Granny Annexe in Catford |
| Granny Annexe in West Wickam |
| Granny Annexe in Eltham |
| Granny Annexe in Penge |
| Granny Annexe in Sydenham |
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 - £17,647

Two storey extension - £88,221

Build a timber frame extension - £26,147

Build a swimming pool - £81,147

Single storey extension - £57,944

Side return extension - £43,156

Install an RSJ - £2,347

Outbuilding - £10,147

Build a Mansard loft conversion - £52,147

Loft conversion - £35,130

Build a kitchen extension - £42,147

Hip to gable loft conversion - £42,147

Granny annexe - £87,147

Garden office - £10,147

Convert a Garage - £16,147

Garage - £18,647

Build a flat roof extension - £22,147

Build a dormer loft conversion - £42,147

Concrete foundations - £6,397

Convert a bungalow loft - £29,147

Convert a basement - £39,156