From £87,344
Mardle Developments Ltd is a Bromley based family company who established themselves in 1998 and became incorporated in 2007.We carry out a...
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
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,888
EXCELL BUILDING is a trusted extension builder serving customers in Keston and the surrounding area. Contact us to today to get a competitive quote...
From £87,320
Relax... you have found a reliable extension builder in Keston. PROBUILD (SE) LTD is a friendly and reliable company based in Keston who consider n...
From £87,056
Keston Kent, BR2
Welcome to A & A Roofing SolutionsWe are a professional family-run team experienced in all aspects of roofing, ranging from complete new ro...
From £87,040
Need an Extension Builder in Keston? LEXA BUILDING SERVICES LTD has been helping local clients (10 mile radius) with their extension buildering job...
From £86,456
Keston Bromley, BR2
Highly dedicated company to deliver exceptional customer service
From £87,016
Greater London, BR2
Inscope Management Services Ltd are here to help customers who need an Extension Builder in Keston. We offer a competitive rate to complete all you...

Building a granny annexe ranges from £86,456 (London Quality Construction Group Limited based in BR2) to £87,344 (Mardle Developments Ltd based in BR2), 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 Keston by posting a job with HaMuch. We will send it to extension builders in Keston who will be happy to help you.
| Borough in London |
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| Granny Annexe in Keston |
| Granny Annexe in West Wickam |
| Granny Annexe in Bromley |
| Granny Annexe in Beckenham |
| Granny Annexe in Chislehurst |
| Granny Annexe in Orpington |
| Granny Annexe in Petts Wood |
| Granny Annexe in Catford |
| Granny Annexe in Penge |
| Granny Annexe in Grove Park |
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 - £17,560

Two storey extension - £88,090

Build a timber frame extension - £26,060

Build a swimming pool - £81,060

Single storey extension - £56,200

Side return extension - £42,175

Install an RSJ - £2,260

Outbuilding - £10,060

Build a Mansard loft conversion - £52,060

Loft conversion - £34,313

Build a kitchen extension - £42,060

Hip to gable loft conversion - £42,060

Granny annexe - £87,060

Garden office - £10,060

Convert a Garage - £16,060

Garage - £18,560

Build a flat roof extension - £22,060

Build a dormer loft conversion - £42,060

Concrete foundations - £6,310

Convert a bungalow loft - £29,060

Convert a basement - £38,175