From £22,128
Trusted and professional extension builder in HP15. Experienced in all extension buildering work and keeping within budget and on quote. Steve Knig...
From £22,368
Steve Knight Construction is a High Wycombe based Building Company with 38 years experience in all aspects of the Construction Industry. We are abl...
From £22,392
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £22,072
As a full-service provider, we are dedicated to delivering an outstanding fit out experience for all of our customers. With our innovative designs,...
From £23,448
Need an Extension Builder in HP15? Bantry Construction Limited has been helping local clients (20 mile radius) with their extension buildering jobs...
From £22,272
Trusted and professional extension builder in HP15. Experienced in all extension buildering work and keeping within budget and on quote. G T Builde...
From £22,280
Our building services company Charts Project Management and Build has been helping customers in Buckinghamshire and the surrounding area by providi...
From £22,400
E E Construction is an established extension buildering business in HP15. We come highly recommended and provide competitive quotes for your work.<...
From £22,352
CONCEPT BUILD are here to help customers who need an Extension Builder in HP15. We offer a competitive rate to complete all your extension builderi...
From £22,040
Mitchell & Co Building & Renovations Ltd is an established extension buildering business in HP15. We come highly recommended and provide competitiv...

A flat roof extension ranges from the cheapest of £22,040 (Mitchell & Co Building & Renovations Ltd based in HP13) to the dearest of £23,448 (Bantry Construction Limited based in HP10), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in HP15 by posting a job with HaMuch. We'll send it to extension builders in HP15.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Hazlemere | £40 | £272 |
| Build A Flat Roof Extension near High Wycombe | £39 | £272 |
| Build A Flat Roof Extension near Wycombe | £39 | £271 |
| Build A Flat Roof Extension near Chesham | £42 | £277 |
| Build A Flat Roof Extension near Gerrards Cross | £43 | £282 |
| Build A Flat Roof Extension near Maidenhead | £41 | £273 |
| Build A Flat Roof Extension near Berkhamsted | £41 | £263 |
| Build A Flat Roof Extension near Rickmansworth | £42 | £278 |
| Build A Flat Roof Extension near Dacorum | £42 | £269 |
| Build A Flat Roof Extension near Slough | £42 | £272 |
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 - £17,875

Two storey extension - £88,563

Build a timber frame extension - £26,375

Build a swimming pool - £81,375

Single storey extension - £62,504

Side return extension - £45,721

Install an RSJ - £2,575

Outbuilding - £10,375

Build a Mansard loft conversion - £52,375

Loft conversion - £37,268

Build a kitchen extension - £42,375

Hip to gable loft conversion - £42,375

Granny annexe - £87,375

Garden office - £10,375

Convert a Garage - £16,375

Garage - £18,875

Build a flat roof extension - £22,375

Build a dormer loft conversion - £42,375

Concrete foundations - £6,625

Convert a bungalow loft - £29,375

Convert a basement - £41,721