From £10,048
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in SE18. 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 SE18. No obligation free quotes and many happy cust...
From £9,984
JK Doors is a trusted extension builder serving customers in SE18 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 SE18? 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 SE18 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 SE18. Experienced in all extension buildering work and keeping within budget and on quote. GR MAINTEN...
From £10,200
Relax... you have found a reliable extension builder in SE18. Derryard Construction Ltd is a friendly and reliable company based in SE18 who consid...

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 SE18 by posting a job with HaMuch. We'll send it to extension builders in SE18.
"Garden office" - WOOLWICH, job posted 01/01/70
| Borough in London |
|---|
| Garden Office in Woolwich |
| Garden Office in Charlton |
| Garden Office in Abbey Wood |
| Garden Office in Thamesmead |
| Garden Office in Welling |
| Garden Office in Blackheath |
| Garden Office in Canning Town |
| Garden Office in Eltham |
| Garden Office in East Ham |
| Garden Office in Erith |
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 - £17,729

Two storey extension - £88,343

Build a timber frame extension - £26,229

Build a swimming pool - £81,229

Single storey extension - £59,576

Side return extension - £44,074

Install an RSJ - £2,429

Outbuilding - £10,229

Build a Mansard loft conversion - £52,229

Loft conversion - £35,895

Build a kitchen extension - £42,229

Hip to gable loft conversion - £42,229

Granny annexe - £87,229

Garden office - £10,229

Convert a Garage - £16,229

Garage - £18,729

Build a flat roof extension - £22,229

Build a dormer loft conversion - £42,229

Concrete foundations - £6,479

Convert a bungalow loft - £29,229

Convert a basement - £40,074