From £22,200
WJW Home Improvements - Friendly and professional builders. We specialize in extensions, loft conversions, and big renovation projects. Our motto i...
From £22,128
Relax... you have found a reliable extension builder in OX12. CHF CONSTRUCTION is a friendly and reliable company based in OX12 who consider no job...
From £22,224
SH Carpentry and Construction Ltd is a professional, reliable and friendly carpentry, joinery and general construction company working in and aroun...
From £21,960
Friendly local builder... professional tidy and competitive....
From £22,120
Bluestones Garden Design Ltd is an established and experienced local extension builder in OX12. Please contact us for a free, no obligation quote a...
From £22,200
The business can carry out all aspects of building work:- single or double storey extensions- kitchen and bathroom installations- p...
From £22,104
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £22,032
Trusted and professional extension builder in OX12. Experienced in all extension buildering work and keeping within budget and on quote. Jamie Lang...
From £21,976
D.Bradbury Property Services are here to help customers who need an Extension Builder in OX12. We offer a competitive rate to complete all your ext...
From £22,096
Trusted and professional extension builder in OX12. Experienced in all extension buildering work and keeping within budget and on quote. Jigsaw Com...

A flat roof extension ranges from the cheapest of £21,960 (Threesixfive FM Services Ltd based in OX11) to the dearest of £22,224 (SH Carpentry & Construction Limited based in OX12), 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 OX12 by posting a job with HaMuch. We'll send it to extension builders in OX12.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Vale of White Horse | £36 | £271 |
| Build A Flat Roof Extension near Didcot | £36 | £266 |
| Build A Flat Roof Extension near Abingdon-on-Thames | £35 | £258 |
| Build A Flat Roof Extension near Oxford | £37 | £265 |
| Build A Flat Roof Extension near Witney | £32 | £244 |
| Build A Flat Roof Extension near Newbury | £37 | £262 |
| Build A Flat Roof Extension near Stratton St Margaret | £37 | £238 |
| Build A Flat Roof Extension near South Oxfordshire | £36 | £253 |
| Build A Flat Roof Extension near Swindon | £38 | £238 |
| Build A Flat Roof Extension near Thatcham | £38 | £266 |
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 - £17,604

Two storey extension - £88,156

Build a timber frame extension - £26,104

Build a swimming pool - £81,104

Single storey extension - £57,080

Side return extension - £42,670

Install an RSJ - £2,304

Outbuilding - £10,104

Build a Mansard loft conversion - £52,104

Loft conversion - £34,725

Build a kitchen extension - £42,104

Hip to gable loft conversion - £42,104

Granny annexe - £87,104

Garden office - £10,104

Convert a Garage - £16,104

Garage - £18,604

Build a flat roof extension - £22,104

Build a dormer loft conversion - £42,104

Concrete foundations - £6,354

Convert a bungalow loft - £29,104

Convert a basement - £38,670