From £21,960
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £22,208
Maha Khaliq Design is an established and experienced local extension builder in HP27. Please contact us for a free, no obligation quote and competi...

A flat roof extension ranges from the cheapest of £21,960 (Bellwood Homes based in HP27) to the dearest of £22,208 (Maha Khaliq Design based in HP27), 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 HP27 by posting a job with HaMuch. We'll send it to extension builders in HP27.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Wycombe | £40 | £271 |
| 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 Aylesbury | £42 | £270 |
| Build A Flat Roof Extension near Chesham | £42 | £277 |
| Build A Flat Roof Extension near Berkhamsted | £41 | £263 |
| Build A Flat Roof Extension near Aylesbury Vale | £36 | £246 |
| Build A Flat Roof Extension near South Oxfordshire | £36 | £253 |
| Build A Flat Roof Extension near Dacorum | £42 | £269 |
| Build A Flat Roof Extension near Maidenhead | £41 | £273 |
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 - £17,584

Two storey extension - £88,126

Build a timber frame extension - £26,084

Build a swimming pool - £81,084

Single storey extension - £56,680

Side return extension - £42,445

Install an RSJ - £2,284

Outbuilding - £10,084

Build a Mansard loft conversion - £52,084

Loft conversion - £34,538

Build a kitchen extension - £42,084

Hip to gable loft conversion - £42,084

Granny annexe - £87,084

Garden office - £10,084

Convert a Garage - £16,084

Garage - £18,584

Build a flat roof extension - £22,084

Build a dormer loft conversion - £42,084

Concrete foundations - £6,334

Convert a bungalow loft - £29,084

Convert a basement - £38,445