From £40,150
Erald Kanani
Member since August 2025
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Decorating Building Service are here to help customers who need an Extension Builder in E20. We offer a competitive rate to complete all your exten...
M & S Builders is a trusted extension builder serving customers in E20 and the surrounding area. Contact us to today to get a competitive quote for...
B J CULLEN BUILDERS are here to help customers who need an Extension Builder in E20. We offer a competitive rate to complete all your extension bui...
Relax... you have found a reliable extension builder in E20. Major Building Contractors Ltd is a friendly and reliable company based in E20 who con...
Need to find an Extension Builder near you for all your extension buildering work?
Sz Builders provides a local, trusted extension builderi...
Experienced extension builder ready to quote for your work. Render is the best extension builder in E20. No obligation free quotes and many happy c...
Experienced extension builder ready to quote for your work. Jhon is the best extension builder in E20. No obligation free quotes and many happy cus...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Kunshi Services UK Ltd is a trusted extension builder serving customers in E20 and the surrounding area. Contact us to today to get a competitive q...

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 E20.
"Side return extension cost for a ground floor." - IG11, job posted 01/01/70
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 - £17,636

Two storey extension - £88,204

Build a timber frame extension - £26,136

Build a swimming pool - £81,136

Single storey extension - £57,720

Side return extension - £43,030

Install an RSJ - £2,336

Outbuilding - £10,136

Build a Mansard loft conversion - £52,136

Loft conversion - £35,025

Build a kitchen extension - £42,136

Hip to gable loft conversion - £42,136

Granny annexe - £87,136

Garden office - £10,136

Convert a Garage - £16,136

Garage - £18,636

Build a flat roof extension - £22,136

Build a dormer loft conversion - £42,136

Concrete foundations - £6,386

Convert a bungalow loft - £29,136

Convert a basement - £39,030