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Chris Czerwinski
About us: Buildmac Ltd is a well-established, trustworthy, reliable and professional business based in High Wycombe, covering all surrounding areas...
Relax... you have found a reliable extension builder in HP12. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in HP12 who co...
Relax... you have found a reliable extension builder in HP12. Building High Wycombe is a friendly and reliable company based in HP12 who consider n...
Mitchell & Co Building & Renovations Ltd is an established extension buildering business in HP12. We come highly recommended and provide competitiv...
Steve Knight Construction is a High Wycombe based Building Company with 38 years experience in all aspects of the Construction Industry. We are abl...
GREENWORKS CONSTRUCTION is an established and experienced local extension builder in HP12. Please contact us for a free, no obligation quote and co...
Our building services company Charts Project Management and Build has been helping customers in Buckinghamshire and the surrounding area by providi...
Trusted and professional extension builder in HP12. Experienced in all extension buildering work and keeping within budget and on quote. Shaks buil...
Need to find an Extension Builder near you for all your extension buildering work?
Loudwater Building Services provides a local, trusted ex...
E E Construction is an established extension buildering business in HP12. We come highly recommended and provide competitive quotes for your work.<...

Outbuilding costs in HP12 range from the cheapest of £10,032 (GREENWORKS CONSTRUCTION based in SL7) to the dearest of £10,400 (E E Construction based in HP10), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in HP12 by posting a job with HaMuch and we will send it to extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near High Wycombe | £39 | £272 |
| Outbuilding near Wycombe | £40 | £271 |
| Outbuilding near Hazlemere | £40 | £272 |
| Outbuilding near Maidenhead | £41 | £273 |
| Outbuilding near Chesham | £42 | £277 |
| Outbuilding near Gerrards Cross | £43 | £283 |
| Outbuilding near Slough | £42 | £272 |
| Outbuilding near Windsor & Maidenhead | £42 | £272 |
| Outbuilding near Windsor | £41 | £271 |
| Outbuilding near Rickmansworth | £43 | £282 |
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 - £17,716

Two storey extension - £88,324

Build a timber frame extension - £26,216

Build a swimming pool - £81,216

Single storey extension - £59,320

Side return extension - £43,930

Install an RSJ - £2,416

Outbuilding - £10,216

Build a Mansard loft conversion - £52,216

Loft conversion - £35,775

Build a kitchen extension - £42,216

Hip to gable loft conversion - £42,216

Granny annexe - £87,216

Garden office - £10,216

Convert a Garage - £16,216

Garage - £18,716

Build a flat roof extension - £22,216

Build a dormer loft conversion - £42,216

Concrete foundations - £6,466

Convert a bungalow loft - £29,216

Convert a basement - £39,930