SJ Expert Building Services are here to help customers who need an Extension Builder in N2. We offer a competitive rate to complete all your extens...
Ivaylo Shkodrov
Extremely reliable service . Flexibility, correct, listening customer. Wide experience.
Relax... you have found a reliable extension builder in N2. Taylor Construction Services Ltd is a friendly and reliable company based in N2 who con...
Need to find an Extension Builder near you for all your extension buildering work?
Raf's Building Service provides a local, trusted extensi...
Need the extension buildering job done quickly without breaking the bank? Swiftdale Developments Ltd offer fast, reliable, and affordable extension...
Trusted and professional extension builder in N2. Experienced in all extension buildering work and keeping within budget and on quote. DS Construct...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Barney Arundell
Trusted and professional extension builder in N2. Experienced in all extension buildering work and keeping within budget and on quote. Arundell Ass...
Chelebi Builders is a bespoke Build & Design construction company based in North London. Our expertise range from Loft Conversions, Extensions, Hou...
Trusted and professional extension builder in N2. Experienced in all extension buildering work and keeping within budget and on quote. Gwe construc...

Costs range from £86,980 (Onyx Iv based in N11) to £88,564 (DS Construction based in N3), 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 - £17,532

Two storey extension - £88,048

Build a timber frame extension - £26,032

Build a swimming pool - £81,032

Single storey extension - £55,640

Side return extension - £41,860

Install an RSJ - £2,232

Outbuilding - £10,032

Build a Mansard loft conversion - £52,032

Loft conversion - £34,050

Build a kitchen extension - £42,032

Hip to gable loft conversion - £42,032

Granny annexe - £87,032

Garden office - £10,032

Convert a Garage - £16,032

Garage - £18,532

Build a flat roof extension - £22,032

Build a dormer loft conversion - £42,032

Concrete foundations - £6,282

Convert a bungalow loft - £29,032

Convert a basement - £37,860