From £23,136
Paramount Brickwork Limited is an established extension buildering business in Onslow Village. We come highly recommended and provide competitive q...
From £22,344
We work closely with our Clients to provide the most suitable procurement route to suit each Client’s requirements and aspirations. We are experi...
From £22,536
We provide structural engineering design and construction service (D&B) Our dedicated, enthusiastic and highly qualified staff to find the appropri...
From £22,320
Need an Extension Builder in Onslow Village? P J HARDIMAN BUILDING CONTRACT has been helping local clients (20 mile radius) with their extension bu...
From £22,392
Cannon Build Solutions is a local family-run building firm whose strong reliable reputation has been well established in North-West London and Buck...
From £22,320
M &M GENERAL BUILDING is an established extension buildering business in Onslow Village. We come highly recommended and provide competitive quotes ...
From £22,256
Need to find an Extension Builder near you for all your extension buildering work?
Griffin Design & Build provides a local, trusted extensi...
From £22,032
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £22,464
Victorian Roofing & Property Maintenance is an established and experienced local extension builder in Onslow Village. Please contact us for a free,...
From £22,032
ALEXANDER BUILDERS is an established extension buildering business in Onslow Village. We come highly recommended and provide competitive quotes fo...

A flat roof extension ranges from the cheapest of £22,032 (Elite Roofing and Building based in GU1) to the dearest of £23,136 (Paramount Brickwork Limited based in GU3), 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 Onslow Village by posting a job with HaMuch. We'll send it to extension builders in Onslow Village.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Guildford | £53 | £298 |
| Build A Flat Roof Extension near Woking | £43 | £277 |
| Build A Flat Roof Extension near Ash Vale | £41 | £277 |
| Build A Flat Roof Extension near Waverley | £68 | £313 |
| Build A Flat Roof Extension near Aldershot | £41 | £275 |
| Build A Flat Roof Extension near Farnborough | £41 | £273 |
| Build A Flat Roof Extension near Farnham | £41 | £276 |
| Build A Flat Roof Extension near Camberley | £41 | £283 |
| Build A Flat Roof Extension near New Haw | £43 | £273 |
| Build A Flat Roof Extension near Great Bookham | £42 | £281 |
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 - £17,883

Two storey extension - £88,575

Build a timber frame extension - £26,383

Build a swimming pool - £81,383

Single storey extension - £62,664

Side return extension - £45,811

Install an RSJ - £2,583

Outbuilding - £10,383

Build a Mansard loft conversion - £52,383

Loft conversion - £37,343

Build a kitchen extension - £42,383

Hip to gable loft conversion - £42,383

Granny annexe - £87,383

Garden office - £10,383

Convert a Garage - £16,383

Garage - £18,883

Build a flat roof extension - £22,383

Build a dormer loft conversion - £42,383

Concrete foundations - £6,633

Convert a bungalow loft - £29,383

Convert a basement - £41,811