From £42,940
Fornia Build Ltd is an established and experienced local extension builder in EC1Y. Please contact us for a free, no obligation quote and competiti...
From £47,440
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 £41,950
TOP CONSTRUCTION is an established extension buildering business in EC1Y. We come highly recommended and provide competitive quotes for your work.<...
From £43,300
Venta Construction is an established and experienced local extension builder in EC1Y. Please contact us for a free, no obligation quote and competi...
From £44,560
Need an Extension Builder in EC1Y? Aylaa Exclusive has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £42,580
Our family-run building services company Dual City Building Contractors Limited has over 30 years’ experience in the industry. We have been helpi...
From £45,640
Need to find an Extension Builder near you for all your extension buildering work?
Alkemist Build and Decorate provides a local, trusted ex...
From £46,000
Need an Extension Builder in EC1Y? Cadway Group Ltd has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...
From £42,940
Master Build Team is an established extension buildering business in EC1Y. We come highly recommended and provide competitive quotes for your work....
From £41,050
Relax... you have found a reliable extension builder in EC1Y. MM Construction Group is a friendly and reliable company based in EC1Y who consider n...

Comparing extension builders estimates for Side return extension gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for a side return extention by posting your job to extension builders in EC1Y.
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 - £17,708

Two storey extension - £88,312

Build a timber frame extension - £26,208

Build a swimming pool - £81,208

Single storey extension - £59,160

Side return extension - £43,840

Install an RSJ - £2,408

Outbuilding - £10,208

Build a Mansard loft conversion - £52,208

Loft conversion - £35,700

Build a kitchen extension - £42,208

Hip to gable loft conversion - £42,208

Granny annexe - £87,208

Garden office - £10,208

Convert a Garage - £16,208

Garage - £18,708

Build a flat roof extension - £22,208

Build a dormer loft conversion - £42,208

Concrete foundations - £6,458

Convert a bungalow loft - £29,208

Convert a basement - £39,840