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 £22,536
We provide structural engineering design and construction service (D&B) Our dedicated, enthusiastic and highly qualified staff to find the appropri...
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 £22,392
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 GU4. We come highly recommended and provide competitive quotes for your wo...
From £22,160
Experienced extension builder ready to quote for your work. JD CONSTRUCTION is the best extension builder in GU4. No obligation free quotes and man...
From £23,136
Paramount Brickwork Limited is an established extension buildering business in GU4. We come highly recommended and provide competitive quotes for y...
From £22,464
Victorian Roofing & Property Maintenance is an established and experienced local extension builder in GU4. Please contact us for a free, no obligat...
From £22,424
Trusted and professional extension builder in GU4. Experienced in all extension buildering work and keeping within budget and on quote. Chinthurst ...
From £22,232
Experienced extension builder ready to quote for your work. Arrus Knoble Ltd is the best extension builder in GU4. No obligation free quotes and ma...

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 GU4 by posting a job with HaMuch. We'll send it to extension builders in GU4.
| 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 Great Bookham | £42 | £281 |
| Build A Flat Roof Extension near Ash Vale | £41 | £277 |
| Build A Flat Roof Extension near New Haw | £43 | £273 |
| 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 Elmbridge | £43 | £277 |
| Build A Flat Roof Extension near Camberley | £41 | £283 |
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 - £17,904

Two storey extension - £88,606

Build a timber frame extension - £26,404

Build a swimming pool - £81,404

Single storey extension - £63,080

Side return extension - £46,045

Install an RSJ - £2,604

Outbuilding - £10,404

Build a Mansard loft conversion - £52,404

Loft conversion - £37,538

Build a kitchen extension - £42,404

Hip to gable loft conversion - £42,404

Granny annexe - £87,404

Garden office - £10,404

Convert a Garage - £16,404

Garage - £18,904

Build a flat roof extension - £22,404

Build a dormer loft conversion - £42,404

Concrete foundations - £6,654

Convert a bungalow loft - £29,404

Convert a basement - £42,045