Range from the cheapest, mostly independent, £30 per hour and £226 per day (Edinburgh Construction Ltd based in EH1) to the dearest, normally the best, £34 per hour and £241 per day (Bond Projects & Interiors based in EH6).
Comparing hourly and daily rates of extension builders gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Click 'Get quotes' and describe your job and we will send it to your local extension builders for FREE.
Rear Extension - single storey. L shape
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| Job details | Estimate |
| Underpinning a house | £1676 |
| Build a two storey extension | £5585 |
| Build a timber frame extension | £5585 |
| Install a swimming pool | £3351 |
| Cost to build a single storey extension | £44683 |
| Cost to build a side return extension | £51386 |
| Install an RSJ | £977 |
| Build an outbuilding | £2234 |
| Build a mansard loft conversion | £11171 |
| Cost of a loft conversion | £31278 |
| Build a kitchen extension | £11171 |
| Build a hip to gable loft conversion | £8378 |
| Build a granny annexe | £5585 |
| Build a garden office | £2234 |
| Convert a garage | £1117 |
| Build a new garage | £2234 |
| Build a flat roof extension | £1899 |
| Build a dormer loft conversion | £2234 |
| Lay a concrete foundation | £2234 |
| Convert a bungalow loft | £3351 |
| Basement conversion cost | £31278 |