Range from the cheapest, mostly independent, £20 per hour and £150 per day (M J Dornan Builders based in WV8) to the dearest, normally the best, £85 per hour and £650 per day (JG Builders based in WV10).
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.
Extend house by knocking load bearing wall (SE calculations already available), install RSJ Beam, Insulate Timber Frame extension with new roof (plus rooflight), new patio door, install new windows, remove waste pipe, install radiator, install spotlights, skim/plaster, install flooring
Required porch extension https://i.pinimg.com/550x/29/fd/7c/29fd7cafeb8a088a45ddd527a9d3dd30.jpg https://images.squarespace-cdn.com/content/v1/56a015a2fd5d08b8dcfa998a/ad81e6b7-5b57-441a-8273-8d3310b17b45/%40the_house_that_jen_built+front+porch+extension.jpg https://i.pinimg.com/550x/29/fd/7c/29fd7cafeb8a088a45ddd527a9d3dd30.jpg
Full house + garden refurbishment of 3 bedroom semi in Erdington, Birmingham
We need Extension Builders like you to help local homeowners with their jobs.
| Job details | Estimate |
| Underpinning a house | £1578 |
| Build a two storey extension | £5259 |
| Build a timber frame extension | £5259 |
| Install a swimming pool | £3155 |
| Cost to build a single storey extension | £42071 |
| Cost to build a side return extension | £48382 |
| Install an RSJ | £920 |
| Build an outbuilding | £2104 |
| Build a mansard loft conversion | £10518 |
| Cost of a loft conversion | £29450 |
| Build a kitchen extension | £10518 |
| Build a hip to gable loft conversion | £7888 |
| Build a granny annexe | £5259 |
| Build a garden office | £2104 |
| Convert a garage | £1052 |
| Build a new garage | £2104 |
| Build a flat roof extension | £1788 |
| Build a dormer loft conversion | £2104 |
| Lay a concrete foundation | £2104 |
| Convert a bungalow loft | £3155 |
| Basement conversion cost | £29450 |