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 £21,800
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
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...
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 £22,024
Experienced extension builder ready to quote for your work. STONEHAM CONSTRUCTION LIMITED is the best extension builder in PO37. No obligation free...
From £22,048
for a reliable friendly family business catering for the clients wishes.
From £21,880
P D Builders is an established and experienced local extension builder in PO37. Please contact us for a free, no obligation quote and competitive r...
From £21,864
Need to find an Extension Builder near you for all your extension buildering work?
Glenn Millmore provides a local, trusted extension build...

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 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 |
| Build A Flat Roof Extension near Horndean | £35 | £253 |
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 - £17,373

Two storey extension - £87,809

Build a timber frame extension - £25,873

Build a swimming pool - £80,873

Single storey extension - £52,456

Side return extension - £40,069

Install an RSJ - £2,073

Outbuilding - £9,873

Build a Mansard loft conversion - £51,873

Loft conversion - £32,558

Build a kitchen extension - £41,873

Hip to gable loft conversion - £41,873

Granny annexe - £86,873

Garden office - £9,873

Convert a Garage - £15,873

Garage - £18,373

Build a flat roof extension - £21,873

Build a dormer loft conversion - £41,873

Concrete foundations - £6,123

Convert a bungalow loft - £28,873

Convert a basement - £36,069