From £22,272
Need an Extension Builder in EC2Y? Aylaa Exclusive has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £22,392
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 £22,040
TOP CONSTRUCTION is an established extension buildering business in EC2Y. We come highly recommended and provide competitive quotes for your work.<...
From £22,128
Fornia Build Ltd is an established and experienced local extension builder in EC2Y. Please contact us for a free, no obligation quote and competiti...
From £22,528
Bring your vision to life with Fornia build. Our main aim is to design and build exceptional residential properties in prime locations, to the high...
From £22,160
Venta Construction is an established and experienced local extension builder in EC2Y. Please contact us for a free, no obligation quote and competi...
From £22,104
SCANDIIN is an established and experienced local extension builder in EC2Y. Please contact us for a free, no obligation quote and competitive rates...
From £22,256
Need an Extension Builder in EC2Y? Flow Property Services has been helping local clients (5 mile radius) with their extension buildering jobs for m...
From £21,920
Experienced extension builder ready to quote for your work. Kovacs Construction Ltd is the best extension builder in EC2Y. No obligation free quote...
From £22,272
At Kovacs Construction, you can rely on our talented builders and engineers to deliver unrivalled building services solutions. Let us show you our ...

A flat roof extension ranges from the cheapest of £21,920 (Kovacs Construction Ltd based in EC1N) to the dearest of £22,528 (Fornia Build Ltd based in EC1V), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in EC2Y by posting a job with HaMuch. We'll send it to extension builders in EC2Y.
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 - £17,707

Two storey extension - £88,311

Build a timber frame extension - £26,207

Build a swimming pool - £81,207

Single storey extension - £59,144

Side return extension - £43,831

Install an RSJ - £2,407

Outbuilding - £10,207

Build a Mansard loft conversion - £52,207

Loft conversion - £35,693

Build a kitchen extension - £42,207

Hip to gable loft conversion - £42,207

Granny annexe - £87,207

Garden office - £10,207

Convert a Garage - £16,207

Garage - £18,707

Build a flat roof extension - £22,207

Build a dormer loft conversion - £42,207

Concrete foundations - £6,457

Convert a bungalow loft - £29,207

Convert a basement - £39,831