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Lee Townsend
Need to find an Extension Builder near you for all your extension buildering work?
Lp Townsend Brickwork provides a local, trusted extensio...
Need an Extension Builder in Iver? S.K Singh has been helping local clients (10 mile radius) with their extension buildering jobs for many years. G...
Vital Builders are here to help customers who need an Extension Builder in Iver. We offer a competitive rate to complete all your extension builder...
GMB BUILDING SERVICES is an established and experienced local extension builder in Iver. Please contact us for a free, no obligation quote and comp...
Nirvair Builders is an established extension buildering business in Iver. We come highly recommended and provide competitive quotes for your work.<...
Trusted and professional extension builder in Iver. Experienced in all extension buildering work and keeping within budget and on quote. DC Build &...
Bill Matharu
Matharu Buildings is an established extension buildering business in Iver. We come highly recommended and provide competitive quotes for your work....
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Trusted and professional extension builder in Iver. Experienced in all extension buildering work and keeping within budget and on quote. SME Builde...

A flat roof extension ranges from the cheapest of £21,888 (Nirvair Builders based in UB3) to the dearest of £22,432 (GMB BUILDING SERVICES based in UB8), 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 Iver by posting a job with HaMuch. We'll send it to extension builders in Iver.
"Flat roof extension" - WEST DRAYTON, job posted 23/11/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Hillingdon | £43 | £276 |
| Build A Flat Roof Extension near Slough | £42 | £272 |
| Build A Flat Roof Extension near Windsor & Maidenhead | £42 | £272 |
| Build A Flat Roof Extension near Gerrards Cross | £43 | £283 |
| Build A Flat Roof Extension near Windsor | £41 | £271 |
| Build A Flat Roof Extension near Staines-upon-Thames | £42 | £269 |
| Build A Flat Roof Extension near Egham | £42 | £266 |
| Build A Flat Roof Extension near Hounslow | £43 | £272 |
| Build A Flat Roof Extension near Rickmansworth | £43 | £282 |
| Build A Flat Roof Extension near Harrow | £43 | £270 |
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 - £17,683

Two storey extension - £88,275

Build a timber frame extension - £26,183

Build a swimming pool - £81,183

Single storey extension - £58,664

Side return extension - £43,561

Install an RSJ - £2,383

Outbuilding - £10,183

Build a Mansard loft conversion - £52,183

Loft conversion - £35,468

Build a kitchen extension - £42,183

Hip to gable loft conversion - £42,183

Granny annexe - £87,183

Garden office - £10,183

Convert a Garage - £16,183

Garage - £18,683

Build a flat roof extension - £22,183

Build a dormer loft conversion - £42,183

Concrete foundations - £6,433

Convert a bungalow loft - £29,183

Convert a basement - £39,561