From £88,072
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in N14. No obligation free quotes ...
From £87,952
B J CULLEN BUILDERS are here to help customers who need an Extension Builder in N14. We offer a competitive rate to complete all your extension bui...
From £88,048
Relax... you have found a reliable extension builder in N14. Major Building Contractors Ltd is a friendly and reliable company based in N14 who con...
From £88,276
Need to find an Extension Builder near you for all your extension buildering work?
Sz Builders provides a local, trusted extension builderi...
From £89,068
Experienced extension builder ready to quote for your work. Render is the best extension builder in N14. No obligation free quotes and many happy c...
From £87,844
Experienced extension builder ready to quote for your work. Jhon is the best extension builder in N14. No obligation free quotes and many happy cus...
From £87,820
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...
From £88,288
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
From £88,468
skilled worker who specializes in completing a wide range of building and renovation projects
From £88,048
M & S Builders is a trusted extension builder serving customers in N14 and the surrounding area. Contact us to today to get a competitive quote for...

Costs range from £87,820 (Can design and Construction based in Ig11) to £89,068 (Render based in IG1), but these are just estimates. The best way to compare costs is to get real quotes from real builders.
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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 - £17,626

Two storey extension - £88,188

Build a timber frame extension - £26,126

Build a swimming pool - £81,126

Single storey extension - £57,512

Side return extension - £42,913

Install an RSJ - £2,326

Outbuilding - £10,126

Build a Mansard loft conversion - £52,126

Loft conversion - £34,928

Build a kitchen extension - £42,126

Hip to gable loft conversion - £42,126

Granny annexe - £87,126

Garden office - £10,126

Convert a Garage - £16,126

Garage - £18,626

Build a flat roof extension - £22,126

Build a dormer loft conversion - £42,126

Concrete foundations - £6,376

Convert a bungalow loft - £29,126

Convert a basement - £38,913