Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £22,168
MJP Building Services are here to help customers who need an Extension Builder in PO37. We offer a competitive rate to complete all your extension ...
From £21,832
Diamond Wight Building is an established and experienced local extension builder in PO37. Please contact us for a free, no obligation quote and com...
From £22,000
With an interest in architecture and interior design I’ve always enjoyed being creative with RAW materials and building something different.Havin...

A flat roof extension ranges from the cheapest of £21,344 (G A Headlam based in PO38) to the dearest of £22,168 (MJP Building Services based in PO38), 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 PO37 by posting a job with HaMuch. We'll send it to extension builders in PO37.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Ryde | £34 | £255 |
| Build A Flat Roof Extension near Isle of Wight | £34 | £246 |
| Build A Flat Roof Extension near Gosport | £35 | £246 |
| Build A Flat Roof Extension near Lee-on-the-Solent | £35 | £249 |
| Build A Flat Roof Extension near Portsmouth | £36 | £250 |
| Build A Flat Roof Extension near Fareham | £35 | £250 |
| Build A Flat Roof Extension near Locks Heath | £33 | £240 |
| Build A Flat Roof Extension near Havant & Waterloo | £35 | £248 |
| Build A Flat Roof Extension near Havant | £35 | £249 |
| Build A Flat Roof Extension near Waterlooville | £36 | £250 |
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 - £17,319

Two storey extension - £87,728

Build a timber frame extension - £25,819

Build a swimming pool - £80,819

Single storey extension - £51,373

Side return extension - £39,460

Install an RSJ - £2,019

Outbuilding - £9,819

Build a Mansard loft conversion - £51,819

Loft conversion - £32,050

Build a kitchen extension - £41,819

Hip to gable loft conversion - £41,819

Granny annexe - £86,819

Garden office - £9,819

Convert a Garage - £15,819

Garage - £18,319

Build a flat roof extension - £21,819

Build a dormer loft conversion - £41,819

Concrete foundations - £6,069

Convert a bungalow loft - £28,819

Convert a basement - £35,460