From £10,208
Need to find an Extension Builder near you for all your extension buildering work?
Albion Roofing Solutions provides a local, trusted exten...
From £9,984
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £10,072
Trusted and professional extension builder in SE26. Experienced in all extension buildering work and keeping within budget and on quote. NKD Contra...
From £10,312
Pure Building & Maintenance is a family run business with over 35 years' experience. Comprising a team of dedicated professionals who all have the...
From £9,904
Need to find an Extension Builder near you for all your extension buildering work?
STOYANOV CONSTRUCTION LTD provides a local, trusted exte...
From £10,248
Baseline Build and Renovate Ltd is an established extension buildering business in SE26. We come highly recommended and provide competitive quotes ...
From £9,952
Our building services company Ruspi Ltd has many years of experience.We have been helping customers in London and the surrounding area by p...
From £10,040
Need to find an Extension Builder near you for all your extension buildering work?
Smartroofingbuildingcontractorsltd provides a local, tru...
From £10,424
Experienced extension builder ready to quote for your work. Claudiu Mihaila is the best extension builder in SE26. No obligation free quotes and ma...
From £10,432
We are a family run local business that was founded in 2007. Universal Plastering Ltd provides a wide variety of building and plastering services i...

Garden offices range from the cheapest of £9,904 (STOYANOV CONSTRUCTION LTD based in SE23) to the dearest of £10,432 (Universal Plastering Ltd based in SE19), 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 SE26 by posting a job with HaMuch. We'll send it to extension builders in SE26.
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 - £17,658

Two storey extension - £88,236

Build a timber frame extension - £26,158

Build a swimming pool - £81,158

Single storey extension - £58,152

Side return extension - £43,273

Install an RSJ - £2,358

Outbuilding - £10,158

Build a Mansard loft conversion - £52,158

Loft conversion - £35,228

Build a kitchen extension - £42,158

Hip to gable loft conversion - £42,158

Granny annexe - £87,158

Garden office - £10,158

Convert a Garage - £16,158

Garage - £18,658

Build a flat roof extension - £22,158

Build a dormer loft conversion - £42,158

Concrete foundations - £6,408

Convert a bungalow loft - £29,158

Convert a basement - £39,273