From £91,096
London, EC1R
We build Lofts. We build Extensions. We undertake conversions. Our Terms and conditions apply as shown in our starter packs.
From £88,300
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,880
Experienced extension builder ready to quote for your work. Kovacs Construction Ltd is the best extension builder in EC1R. No obligation free quote...
From £88,408
At Kovacs Construction, you can rely on our talented builders and engineers to deliver unrivalled building services solutions. Let us show you our ...
From £88,408
Experienced extension builder ready to quote for your work. Oxford West is the best extension builder in EC1R. No obligation free quotes and many h...
From £88,060
JM Building Services is a trusted extension builder serving customers in EC1R and the surrounding area. Contact us to today to get a competitive qu...
From £88,588
We have the experience and knowledge to carry out any project, big or small. Our team of experts thoroughly plan the budget and manage your projec...
From £88,324
Buildwiser is a trusted extension builder serving customers in EC1R and the surrounding area. Contact us to today to get a competitive quote for ex...
From £88,612
Centaurus is one of North London's most experienced builders. With expert craftsmanship, attention to detail, the right materials we are committed ...
From £88,612
Trusted and professional extension builder in EC1R. Experienced in all extension buildering work and keeping within budget and on quote. Cedar Deve...

Costs range from £87,880 (Kovacs Construction Ltd based in EC1N) to £91,096 (Q Lofts and Extensions based in EC1R), 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 - £17,919

Two storey extension - £88,629

Build a timber frame extension - £26,419

Build a swimming pool - £81,419

Single storey extension - £63,384

Side return extension - £46,216

Install an RSJ - £2,619

Outbuilding - £10,419

Build a Mansard loft conversion - £52,419

Loft conversion - £37,680

Build a kitchen extension - £42,419

Hip to gable loft conversion - £42,419

Granny annexe - £87,419

Garden office - £10,419

Convert a Garage - £16,419

Garage - £18,919

Build a flat roof extension - £22,419

Build a dormer loft conversion - £42,419

Concrete foundations - £6,669

Convert a bungalow loft - £29,419

Convert a basement - £42,216