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 £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 £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...

A flat roof extension ranges from the cheapest of £21,832 (CEDAR INTERIORS LIMITED based in OX16) 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 | £261 |
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 - £17,463

Two storey extension - £87,944

Build a timber frame extension - £25,963

Build a swimming pool - £80,963

Single storey extension - £54,253

Side return extension - £41,080

Install an RSJ - £2,163

Outbuilding - £9,963

Build a Mansard loft conversion - £51,963

Loft conversion - £33,400

Build a kitchen extension - £41,963

Hip to gable loft conversion - £41,963

Granny annexe - £86,963

Garden office - £9,963

Convert a Garage - £15,963

Garage - £18,463

Build a flat roof extension - £21,963

Build a dormer loft conversion - £41,963

Concrete foundations - £6,213

Convert a bungalow loft - £28,963

Convert a basement - £37,080