From £10,048
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in SE14. No obligation free quotes...
From £10,560
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...
From £10,096
Experienced extension builder ready to quote for your work. Mr is the best extension builder in SE14. No obligation free quotes and many happy cust...
From £9,984
JK Doors is a trusted extension builder serving customers in SE14 and the surrounding area. Contact us to today to get a competitive quote for exte...
From £10,192
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
From £10,392
Need an Extension Builder in SE14? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...
From £10,312
skilled worker who specializes in completing a wide range of building and renovation projects
From £10,616
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in SE14 and the surrounding area. Contact us to today to get a com...
From £9,888
Member since April 2025
Trusted and professional extension builder in SE14. Experienced in all extension buildering work and keeping within budget and on quote. GR MAINTEN...
From £10,312
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Garden offices range from the cheapest of £9,888 (GR MAINTENANCE LTD based in IG11) to the dearest of £10,616 (HOUSE BUILDING SERVICES LIMITED based in DA16), but these are only estimates.
The best way to compare costs is to get actual quotes.
Get rates and quotes to build a garden office in SE14 by posting a job with HaMuch. We'll send it to extension builders in SE14.
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 - £17,740

Two storey extension - £88,360

Build a timber frame extension - £26,240

Build a swimming pool - £81,240

Single storey extension - £59,800

Side return extension - £44,200

Install an RSJ - £2,440

Outbuilding - £10,240

Build a Mansard loft conversion - £52,240

Loft conversion - £36,000

Build a kitchen extension - £42,240

Hip to gable loft conversion - £42,240

Granny annexe - £87,240

Garden office - £10,240

Convert a Garage - £16,240

Garage - £18,740

Build a flat roof extension - £22,240

Build a dormer loft conversion - £42,240

Concrete foundations - £6,490

Convert a bungalow loft - £29,240

Convert a basement - £40,200