From £22,440
Greater London, EN3
Experienced extension builder ready to quote for your work. ICB Building and Civil Engineering is the best extension builder in EN3. No obligation ...
From £22,184
Relax... you have found a reliable extension builder in EN3. Arkley Refurbishments is a friendly and reliable company based in EN3 who consider no ...
From £21,976
Ponders End, EN3
DW Building is a trusted extension builder serving customers in EN3 and the surrounding area. Contact us to today to get a competitive quote for ex...
From £21,872
Need an Extension Builder in EN3? Colin Lynch Builders has been helping local clients (10 mile radius) with their extension buildering jobs for man...
From £22,520
Greater London, EN3
BHM Developments and Property Management Ltd is dedicated to providing you with the highest quality of building services available. We carry out ev...
From £22,320
BROWNLOW BUILDING SUPPLIES LTD are here to help customers who need an Extension Builder in EN3. We offer a competitive rate to complete all your ex...
From £21,976
Ponders End, EN3
ALEX BUILDING & DECORATING is a trusted extension builder serving customers in EN3 and the surrounding area. Contact us to today to get a competiti...
From £22,160
Need to find an Extension Builder near you for all your extension buildering work?
Elston's provision hub provides a local, trusted extensi...
From £22,528
Hertfordshire, EN3
Relax... you have found a reliable extension builder in EN3. United construction group is a friendly and reliable company based in EN3 who consider...
From £22,152
IRIS Building and Services is a family run nationwide company base on family values and core British tradition. After growing up with a passion for...

A flat roof extension ranges from the cheapest of £21,872 (Colin Lynch Builders based in EN3) to the dearest of £22,528 (United construction group based in EN3), 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 EN3 by posting a job with HaMuch. We'll send it to extension builders in EN3.
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 - £17,713

Two storey extension - £88,319

Build a timber frame extension - £26,213

Build a swimming pool - £81,213

Single storey extension - £59,256

Side return extension - £43,894

Install an RSJ - £2,413

Outbuilding - £10,213

Build a Mansard loft conversion - £52,213

Loft conversion - £35,745

Build a kitchen extension - £42,213

Hip to gable loft conversion - £42,213

Granny annexe - £87,213

Garden office - £10,213

Convert a Garage - £16,213

Garage - £18,713

Build a flat roof extension - £22,213

Build a dormer loft conversion - £42,213

Concrete foundations - £6,463

Convert a bungalow loft - £29,213

Convert a basement - £39,894