From £42,040
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in SE27. No obligation free quotes...
From £43,750
Relax... you have found a reliable extension builder in SE27. Derryard Construction Ltd is a friendly and reliable company based in SE27 who consid...
From £41,140
B J CULLEN BUILDERS are here to help customers who need an Extension Builder in SE27. We offer a competitive rate to complete all your extension bu...
From £41,860
Relax... you have found a reliable extension builder in SE27. Major Building Contractors Ltd is a friendly and reliable company based in SE27 who c...
From £43,570
Need to find an Extension Builder near you for all your extension buildering work?
Sz Builders provides a local, trusted extension builderi...
From £49,510
Experienced extension builder ready to quote for your work. Render is the best extension builder in SE27. No obligation free quotes and many happy ...
From £40,330
Experienced extension builder ready to quote for your work. Jhon is the best extension builder in SE27. No obligation free quotes and many happy cu...
From £40,150
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...
From £43,660
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
From £45,010
skilled worker who specializes in completing a wide range of building and renovation projects

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 SE27.
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 - £17,642

Two storey extension - £88,214

Build a timber frame extension - £26,142

Build a swimming pool - £81,142

Single storey extension - £57,848

Side return extension - £43,102

Install an RSJ - £2,342

Outbuilding - £10,142

Build a Mansard loft conversion - £52,142

Loft conversion - £35,085

Build a kitchen extension - £42,142

Hip to gable loft conversion - £42,142

Granny annexe - £87,142

Garden office - £10,142

Convert a Garage - £16,142

Garage - £18,642

Build a flat roof extension - £22,142

Build a dormer loft conversion - £42,142

Concrete foundations - £6,392

Convert a bungalow loft - £29,142

Convert a basement - £39,102