From £88,072
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in EC1M. No obligation free quotes...
From £88,468
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £88,588
Need an Extension Builder in EC1M? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...
From £88,072
Trusted and professional extension builder in EC1M. Experienced in all extension buildering work and keeping within budget and on quote. WHITE EAGL...
From £88,240
Homeowners look no further if you want a qualified extension builder to work in your home. LCD Pixel Construction Ltd are tidy and neat, providing ...
From £88,492
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,880
Masonic Plumbing and Heating Ltd are here to help customers who need an Extension Builder in EC1M. We offer a competitive rate to complete all your...
From £88,288
Gb construction are here to help customers who need an Extension Builder in EC1M. We offer a competitive rate to complete all your extension build...
From £88,276
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in EC1M. No obligation free quotes and ...
From £88,840
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...

Costs range from £87,880 (Masonic Plumbing and Heating Ltd based in BR2) to £88,840 (Rafix Building based in EN4), 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 - £17,714

Two storey extension - £88,322

Build a timber frame extension - £26,214

Build a swimming pool - £81,214

Single storey extension - £59,288

Side return extension - £43,912

Install an RSJ - £2,414

Outbuilding - £10,214

Build a Mansard loft conversion - £52,214

Loft conversion - £35,760

Build a kitchen extension - £42,214

Hip to gable loft conversion - £42,214

Granny annexe - £87,214

Garden office - £10,214

Convert a Garage - £16,214

Garage - £18,714

Build a flat roof extension - £22,214

Build a dormer loft conversion - £42,214

Concrete foundations - £6,464

Convert a bungalow loft - £29,214

Convert a basement - £39,912