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 HP15. Building High Wycombe is a friendly and reliable company based in HP15 who consider n...
Mitchell & Co Building & Renovations Ltd is an established extension buildering business in HP15. We come highly recommended and provide competitiv...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Steve Knight Construction is a High Wycombe based Building Company with 38 years experience in all aspects of the Construction Industry. We are abl...
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 HP15. 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...
Chris Warren Construction Ltd is an established extension buildering business in HP15. We come highly recommended and provide competitive quotes fo...
E E Construction is an established extension buildering business in HP15. We come highly recommended and provide competitive quotes for your work.<...

Building a granny annexe ranges from £87,040 (Mitchell & Co Building & Renovations Ltd based in HP13) to £87,400 (E E Construction based in HP10), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in HP15 by posting a job with HaMuch. We will send it to extension builders in HP15 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Hazlemere | £40 | £272 |
| Granny Annexe near High Wycombe | £39 | £272 |
| Granny Annexe near Wycombe | £39 | £271 |
| Granny Annexe near Chesham | £42 | £277 |
| Granny Annexe near Gerrards Cross | £43 | £282 |
| Granny Annexe near Maidenhead | £41 | £273 |
| Granny Annexe near Berkhamsted | £41 | £263 |
| Granny Annexe near Rickmansworth | £42 | £278 |
| Granny Annexe near Dacorum | £42 | £269 |
| Granny Annexe 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 - £17,756

Two storey extension - £88,384

Build a timber frame extension - £26,256

Build a swimming pool - £81,256

Single storey extension - £60,120

Side return extension - £44,380

Install an RSJ - £2,456

Outbuilding - £10,256

Build a Mansard loft conversion - £52,256

Loft conversion - £36,150

Build a kitchen extension - £42,256

Hip to gable loft conversion - £42,256

Granny annexe - £87,256

Garden office - £10,256

Convert a Garage - £16,256

Garage - £18,756

Build a flat roof extension - £22,256

Build a dormer loft conversion - £42,256

Concrete foundations - £6,506

Convert a bungalow loft - £29,256

Convert a basement - £40,380