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Swiftdale Developments Ltd
Need the extension buildering job done quickly without breaking the bank? Swiftdale Developments Ltd offer fast, reliable, and affordable extension...
Onyx Iv
Ivaylo Shkodrov
Extremely reliable service . Flexibility, correct, listening customer. Wide experience.
Taylor Construction Services Ltd
London, N3
Relax... you have found a reliable extension builder in N3. Taylor Construction Services Ltd is a friendly and reliable company based in N3 who con...
DS Construction
Trusted and professional extension builder in N3. Experienced in all extension buildering work and keeping within budget and on quote. DS Construct...
Odp Builders
Need an Extension Builder in N3? Odp Builders has been helping local clients (5 mile radius) with their extension buildering jobs for many years. G...
RF Building Services
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
D.J Coyle & Co.Ltd
Trusted and professional extension builder in N3. Experienced in all extension buildering work and keeping within budget and on quote. D.J Coyle & ...
Chelebi Builders
Chelebi Builders is a bespoke Build & Design construction company based in North London. Our expertise range from Loft Conversions, Extensions, Hou...
Gwe construction
Trusted and professional extension builder in N3. Experienced in all extension buildering work and keeping within budget and on quote. Gwe construc...
From £22,352
AK Builders
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Flat roof extension cost in N3
A flat roof extension ranges from the cheapest of £21,320 (Onyx Iv based in N11) to the dearest of £22,432 (Odp Builders based in N20), 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 N3 by posting a job with HaMuch. We'll send it to extension builders in N3.
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Estimates for common extension builder jobs in N3;
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 - £17,619
Two storey extension - £88,179
Build a timber frame extension - £26,119
Build a swimming pool - £81,119
Single storey extension - £57,384
Side return extension - £42,841
Install an RSJ - £2,319
Outbuilding - £10,119
Build a Mansard loft conversion - £52,119
Loft conversion - £34,868
Build a kitchen extension - £42,119
Hip to gable loft conversion - £42,119
Granny annexe - £87,119
Garden office - £10,119
Convert a Garage - £16,119
Garage - £18,619
Build a flat roof extension - £22,119
Build a dormer loft conversion - £42,119
Concrete foundations - £6,369
Convert a bungalow loft - £29,119
Convert a basement - £38,841