From £10,392
Greater London, EC1A
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 £10,272
Need an Extension Builder in EC1A? Aylaa Exclusive has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £9,920
Experienced extension builder ready to quote for your work. Kovacs Construction Ltd is the best extension builder in EC1A. No obligation free quote...
From £10,272
At Kovacs Construction, you can rely on our talented builders and engineers to deliver unrivalled building services solutions. Let us show you our ...
From £10,104
Greater London, EC1A
SCANDIIN is an established and experienced local extension builder in EC1A. Please contact us for a free, no obligation quote and competitive rates...
From £10,200
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £10,272
Experienced extension builder ready to quote for your work. Oxford West is the best extension builder in EC1A. No obligation free quotes and many h...
From £10,040
JM Building Services is a trusted extension builder serving customers in EC1A and the surrounding area. Contact us to today to get a competitive qu...
From £12,064
We build Lofts. We build Extensions. We undertake conversions. Our Terms and conditions apply as shown in our starter packs.
From £9,992
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Outbuilding costs in EC1A range from the cheapest of £9,920 (Kovacs Construction Ltd based in EC1N) to the dearest of £12,064 (Q Lofts and Extensions based in EC1R), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in EC1A by posting a job with HaMuch and we will send it to extension builders.
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 - £17,853

Two storey extension - £88,529

Build a timber frame extension - £26,353

Build a swimming pool - £81,353

Single storey extension - £62,056

Side return extension - £45,469

Install an RSJ - £2,553

Outbuilding - £10,353

Build a Mansard loft conversion - £52,353

Loft conversion - £37,058

Build a kitchen extension - £42,353

Hip to gable loft conversion - £42,353

Granny annexe - £87,353

Garden office - £10,353

Convert a Garage - £16,353

Garage - £18,853

Build a flat roof extension - £22,353

Build a dormer loft conversion - £42,353

Concrete foundations - £6,603

Convert a bungalow loft - £29,353

Convert a basement - £41,469