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Select your affordable Greater London extension builder
We provide our clients with excellent service and quality. Whether you are looking to extend or upgrade, our professional team has the skills and e...
Julian Cafun
Need an Extension Builder in Greater London? Saintflexs has been helping local clients (10 mile radius) with their extension buildering jobs for m...
Max Dixon
We are a construction company specialising in all aspects of building works, loft construction Extension complete home renovation, structural ...
Cre8tive Contractors Ltd are here to help customers who need an Extension Builder in Greater London. We offer a competitive rate to complete all yo...
Relax... you have found a reliable extension builder in Greater London. L M G Building Services (London) Ltd is a friendly and reliable company bas...
AAB Tile Installation & Repairs are here to help customers who need an Extension Builder in Greater London. We offer a competitive rate to complete...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Rapid Bee Ltd is an established extension buildering business in Greater London. We come highly recommended and provide competitive quotes for your...
Experienced extension builder ready to quote for your work. Aumosa Ltd is the best extension builder in Greater London. No obligation free quotes a...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Building a granny annexe ranges from £86,960 (Rapid Bee Ltd based in SE12) 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 Greater London by posting a job with HaMuch. We will send it to extension builders in Greater London 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 - £17,679

Two storey extension - £88,269

Build a timber frame extension - £26,179

Build a swimming pool - £81,179

Single storey extension - £58,584

Side return extension - £43,516

Install an RSJ - £2,379

Outbuilding - £10,179

Build a Mansard loft conversion - £52,179

Loft conversion - £35,430

Build a kitchen extension - £42,179

Hip to gable loft conversion - £42,179

Granny annexe - £87,179

Garden office - £10,179

Convert a Garage - £16,179

Garage - £18,679

Build a flat roof extension - £22,179

Build a dormer loft conversion - £42,179

Concrete foundations - £6,429

Convert a bungalow loft - £29,179

Convert a basement - £39,516