Range from the cheapest, mostly independent, £15 per hour and £160 per day (T.S Stone Restoration based in CO16) to the dearest, normally the best, £31 per hour and £211 per day (SD Barber Interiors based in CO7).
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.
Remove of kitchen/diner back wall, install steel and fit large sliding doors. Also removal of existing kitchen /diner ceiling and fit new plasterboard for ceiling
Single storey extension
Converting office building to 1s & 2s bed flat
We need extension builders like you to help local homeowners with their jobs.
| Job details | Estimate |
| Underpinning a house | £1425 |
| Build a two storey extension | £4750 |
| Build a timber frame extension | £4750 |
| Install a swimming pool | £2850 |
| Cost to build a single storey extension | £38000 |
| Cost to build a side return extension | £43700 |
| Install an RSJ | £831 |
| Build an outbuilding | £1900 |
| Build a mansard loft conversion | £9500 |
| Cost of a loft conversion | £26600 |
| Build a kitchen extension | £9500 |
| Build a hip to gable loft conversion | £7125 |
| Build a granny annexe | £4750 |
| Build a garden office | £1900 |
| Convert a garage | £950 |
| Build a new garage | £1900 |
| Build a flat roof extension | £1615 |
| Build a dormer loft conversion | £1900 |
| Lay a concrete foundation | £1900 |
| Convert a bungalow loft | £2850 |
| Basement conversion cost | £26600 |