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From £22,176
Fedora and sons Ltd
MIHAI Martolea
Member since September 2026
Fedora and sons Ltd is a trusted extension builder serving customers in E12 and the surrounding area. Contact us to today to get a competitive quot...
From £21,880
Can design and Construction
Erald Kanani
Member since August 2025
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Major Building Contractors Ltd
Relax... you have found a reliable extension builder in E12. Major Building Contractors Ltd is a friendly and reliable company based in E12 who con...
Sz Builders
Need to find an Extension Builder near you for all your extension buildering work?
Sz Builders provides a local, trusted extension builderi...
Render
Experienced extension builder ready to quote for your work. Render is the best extension builder in E12. No obligation free quotes and many happy c...
CC&D BUILDING LTD
Catalin CIOBANU
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in E12. No obligation free quotes and m...
M Saleem Builders
Relax... you have found a reliable extension builder in E12. M Saleem Builders is a friendly and reliable company based in E12 who consider no job ...
KS Plastering SERVICE
Sampson Essien
Thistle Bonding Coat: Ideal for use on low-suction backgrounds such as brick or concrete blocks, this product provided a solid foundation, Thi...
G HAMID CONSTRUCTION LTD
Relax... you have found a reliable extension builder in E12. G HAMID CONSTRUCTION LTD is a friendly and reliable company based in E12 who consider ...
Kaseno Group
Kaseno Group are here to help customers who need an Extension Builder in E12. We offer a competitive rate to complete all your extension buildering...
Flat roof extension cost in E12
A flat roof extension ranges from the cheapest of £21,880 (Can design and Construction based in Ig11) to the dearest of £22,712 (Render based in IG1), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in E12 by posting a job with HaMuch. We'll send it to extension builders in E12.
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- Factors affecting the cost of flat roof extensions
- Advantages and disadvantages of flat roofs
- Which is cheaper: a flat roof or pitched roof?
- How long does a flat roof extension take?
- Do you need planning permission for a flat roof extension?
- How long does a flat roof last?
- Can you walk on a flat roof extension?
- What insulation do I need for a flat roof extension?
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Estimates for common extension builder jobs in E12;
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 - £17,642
Two storey extension - £88,214
Build a timber frame extension - £26,142
Build a swimming pool - £81,142
Single storey extension - £57,848
Side return extension - £43,102
Install an RSJ - £2,342
Outbuilding - £10,142
Build a Mansard loft conversion - £52,142
Loft conversion - £35,085
Build a kitchen extension - £42,142
Hip to gable loft conversion - £42,142
Granny annexe - £87,142
Garden office - £10,142
Convert a Garage - £16,142
Garage - £18,642
Build a flat roof extension - £22,142
Build a dormer loft conversion - £42,142
Concrete foundations - £6,392
Convert a bungalow loft - £29,142
Convert a basement - £39,102