From £6,298
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in SE5. No obligation free quotes ...
From £6,346
Experienced extension builder ready to quote for your work. Mr is the best extension builder in SE5. No obligation free quotes and many happy custo...
From £6,234
JK Doors is a trusted extension builder serving customers in SE5 and the surrounding area. Contact us to today to get a competitive quote for exten...
From £6,442
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
From £6,642
Need an Extension Builder in SE5? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £6,562
skilled worker who specializes in completing a wide range of building and renovation projects
From £6,866
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in SE5 and the surrounding area. Contact us to today to get a comp...
From £6,138
Member since April 2025
Trusted and professional extension builder in SE5. Experienced in all extension buildering work and keeping within budget and on quote. GR MAINTENA...
From £6,562
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £6,450
Relax... you have found a reliable extension builder in SE5. Derryard Construction Ltd is a friendly and reliable company based in SE5 who consider...

Concrete foundations range from the £6,138 (GR MAINTENANCE LTD based in IG11) to £6,866 (HOUSE BUILDING SERVICES LIMITED based in DA16) in SE5.
Comparing extension builders estimates for laying concrete foundations gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Find out the exact cost of laying concrete foundations in SE5 by posting a job with HaMuch. We will send it to extension builders who can give you a detailed quote.
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 - £17,704

Two storey extension - £88,306

Build a timber frame extension - £26,204

Build a swimming pool - £81,204

Single storey extension - £59,080

Side return extension - £43,795

Install an RSJ - £2,404

Outbuilding - £10,204

Build a Mansard loft conversion - £52,204

Loft conversion - £35,663

Build a kitchen extension - £42,204

Hip to gable loft conversion - £42,204

Granny annexe - £87,204

Garden office - £10,204

Convert a Garage - £16,204

Garage - £18,704

Build a flat roof extension - £22,204

Build a dormer loft conversion - £42,204

Concrete foundations - £6,454

Convert a bungalow loft - £29,204

Convert a basement - £39,795