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J&J Building Solutions
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in Streatham. No obligation free q...
Greens Gardening & Landscape Property Maintenance
John Mcdonagh
Watch our short video highlighting all our expertise and services here:
more than 10 y...
From £89,800
Banga Decoration
Sebastian Banga
Member since August 2025
Banga decoration. Is Base in south London for number of year Banga decoration is a small company. Wich provide an excellent job to the custom...
Buci builders ltd
Robert Buci
Buci builders ltd is a trusted extension builder serving customers in Streatham and the surrounding area. Contact us to today to get a competitive ...
J & D Construction
Trusted and professional extension builder in Streatham. Experienced in all extension buildering work and keeping within budget and on quote. J & D...
Langston Builders
Langston Builders is a trusted extension builder serving customers in Streatham and the surrounding area. Contact us to today to get a competitive ...
Sonik Building Services
Trusted and professional extension builder in Streatham. Experienced in all extension buildering work and keeping within budget and on quote. Sonik...
ACE BUILDING CONTRACTORS AND D
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Renaissance Timothy Brewer Ltd
Renaissance Timothy Brewer Ltd is an established extension buildering business in Streatham. We come highly recommended and provide competitive quo...
Tenfold Renovation
Tenfold Renovation
Need to find an Extension Builder near you for all your extension buildering work?
Tenfold Renovation provides a local, trusted extension b...
Cost of a two storey extension in Streatham
Costs range from £88,072 (J&J Building Solutions based in SW16) to £89,800 (Banga Decoration based in CR7), but these are just estimates. The best way to compare costs is to get real quotes from real builders.
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- How much does a two storey extension cost?
- Factors affecting the cost of a double storey extension
- How much value does a two storey extension add to a property?
- Types of two storey extension
- How long does a two storey extension take to build?
- Do you need planning permission for a two storey extension?
- What is the 45-degree rule for two storey extensions?
- Do you need an architect for an extension?
- How to finance an extension
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Estimates for common extension builder jobs in Streatham;
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 - £17,864
Two storey extension - £88,546
Build a timber frame extension - £26,364
Build a swimming pool - £81,364
Single storey extension - £62,280
Side return extension - £45,595
Install an RSJ - £2,564
Outbuilding - £10,364
Build a Mansard loft conversion - £52,364
Loft conversion - £37,163
Build a kitchen extension - £42,364
Hip to gable loft conversion - £42,364
Granny annexe - £87,364
Garden office - £10,364
Convert a Garage - £16,364
Garage - £18,864
Build a flat roof extension - £22,364
Build a dormer loft conversion - £42,364
Concrete foundations - £6,614
Convert a bungalow loft - £29,364
Convert a basement - £41,595