Range from the cheapest, mostly independent, £20 per hour and £160 per day (B Dale Building Construction Ltd based in DN3) to the dearest, normally the best, £50 per hour and £400 per day (Green Exteriors Ltd based in S60).
Comparing hourly and daily rates of Extension Builder's 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.
6 meter rear extension removal or chimney and 3 bedroom detached house flooring and some electrical work
Loft conversion to 2 bedrooms and a bathroom. Velux windows only, as gables already have windows. Building regs required, but not planning permission
Rebuild attached outhouse - dimensions are 3.81m x 3.47
We need Extension Builders like you to help local homeowners with their jobs.
| Job details | Estimate |
| Underpinning a house | £1583 |
| Build a two storey extension | £5277 |
| Build a timber frame extension | £5277 |
| Install a swimming pool | £3166 |
| Cost to build a single storey extension | £42215 |
| Cost to build a side return extension | £48547 |
| Install an RSJ | £923 |
| Build an outbuilding | £2111 |
| Build a mansard loft conversion | £10554 |
| Cost of a loft conversion | £29550 |
| Build a kitchen extension | £10554 |
| Build a hip to gable loft conversion | £7915 |
| Build a granny annexe | £5277 |
| Build a garden office | £2111 |
| Convert a garage | £1055 |
| Build a new garage | £2111 |
| Build a flat roof extension | £1794 |
| Build a dormer loft conversion | £2111 |
| Lay a concrete foundation | £2111 |
| Convert a bungalow loft | £3166 |
| Basement conversion cost | £29550 |