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From £22,240
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

A flat roof extension ranges from the cheapest of £22,240 (DAVID WEBB BUILDING CONT LTD based in DT11) to the dearest of £22,240 (DAVID WEBB BUILDING CONT LTD based in DT11), 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 DT11 by posting a job with HaMuch. We'll send it to extension builders in DT11.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Poole | £38 | £250 |
| Build A Flat Roof Extension near Dorchester | £30 | £230 |
| Build A Flat Roof Extension near Bournemouth | £38 | £257 |
| Build A Flat Roof Extension near Weymouth | £33 | £260 |
| Build A Flat Roof Extension near Christchurch | £36 | £251 |
| Build A Flat Roof Extension near Yeovil | £34 | £294 |
| Build A Flat Roof Extension near Salisbury | £35 | £247 |
| Build A Flat Roof Extension near New Forest | £32 | £245 |
| Build A Flat Roof Extension near South Somerset | £62 | £270 |
| Build A Flat Roof Extension near Frome | £33 | £263 |
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 - £17,740

Two storey extension - £88,360

Build a timber frame extension - £26,240

Build a swimming pool - £81,240

Single storey extension - £59,800

Side return extension - £44,200

Install an RSJ - £2,440

Outbuilding - £10,240

Build a Mansard loft conversion - £52,240

Loft conversion - £36,000

Build a kitchen extension - £42,240

Hip to gable loft conversion - £42,240

Granny annexe - £87,240

Garden office - £10,240

Convert a Garage - £16,240

Garage - £18,740

Build a flat roof extension - £22,240

Build a dormer loft conversion - £42,240

Concrete foundations - £6,490

Convert a bungalow loft - £29,240

Convert a basement - £40,200