From £21,904
NJM GENERAL BUILDING CONTRACTO is an established and experienced local extension builder in OX15. Please contact us for a free, no obligation quote...
From £21,832
CEDAR INTERIORS LIMITED are here to help customers who need an Extension Builder in OX15. We offer a competitive rate to complete all your extensio...
From £22,152
Haras Building Contractors Ltd is a family run business with over 20 years experience within the building trade. We firmly believe in and work from...
From £21,784
ADVANCED BUILDING CONCEPTS is an established and experienced local extension builder in OX15. Please contact us for a free, no obligation quote and...
From £21,816
Trusted and professional extension builder in OX15. Experienced in all extension buildering work and keeping within budget and on quote. P GEORGE C...
From £21,864
Trusted and professional extension builder in OX15. Experienced in all extension buildering work and keeping within budget and on quote. MARCUS STO...
From £21,768
UJ Developments is an established extension buildering business in OX15. We come highly recommended and provide competitive quotes for your work.
From £21,760
M P ALLEN BUILDERS LTD are here to help customers who need an Extension Builder in OX15. We offer a competitive rate to complete all your extension...
From £22,032
Need an Extension Builder in OX15? A C SPENCER BUILDERS has been helping local clients (20 mile radius) with their extension buildering jobs for ma...
From £21,880
Caliber Construction Ltd is a trusted extension builder serving customers in OX15 and the surrounding area. Contact us to today to get a competitiv...

A flat roof extension ranges from the cheapest of £21,760 (M P ALLEN BUILDERS LTD based in CV36) to the dearest of £22,152 (Haras Building Contractors Ltd based in OX16), 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 OX15 by posting a job with HaMuch. We'll send it to extension builders in OX15.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Banbury | £33 | £239 |
| Build A Flat Roof Extension near Cherwell | £35 | £249 |
| Build A Flat Roof Extension near Bicester | £35 | £249 |
| Build A Flat Roof Extension near Stratford-upon-Avon | £27 | £215 |
| Build A Flat Roof Extension near Stratford-on-Avon | £27 | £215 |
| Build A Flat Roof Extension near Daventry | £31 | £230 |
| Build A Flat Roof Extension near Witney | £32 | £244 |
| Build A Flat Roof Extension near Leamington Spa | £27 | £212 |
| Build A Flat Roof Extension near Warwick | £28 | £213 |
| Build A Flat Roof Extension near Oxford | £37 | £265 |
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 - £17,379

Two storey extension - £87,819

Build a timber frame extension - £25,879

Build a swimming pool - £80,879

Single storey extension - £52,584

Side return extension - £40,141

Install an RSJ - £2,079

Outbuilding - £9,879

Build a Mansard loft conversion - £51,879

Loft conversion - £32,618

Build a kitchen extension - £41,879

Hip to gable loft conversion - £41,879

Granny annexe - £86,879

Garden office - £9,879

Convert a Garage - £15,879

Garage - £18,379

Build a flat roof extension - £21,879

Build a dormer loft conversion - £41,879

Concrete foundations - £6,129

Convert a bungalow loft - £28,879

Convert a basement - £36,141