Range from the cheapest £18 per hour and £160 per day (CR Joiners based in G82) to the dearest £35 per hour and £261 per day (Price It Cost Consultants Ltd based in PA16).
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.
yesterday
Single story extension
30/06/2024
This is a Garage conversion, no and extension, I could not find the right trade. We have the drawings from the architect. I can attach those for a better estimate. Thanks
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See table for all Extension Builder rates in West Dunbartonshire
| Job details | Estimate |
| Underpinning a house | £1610 |
| Build a two storey extension | £5366 |
| Build a timber frame extension | £5366 |
| Install a swimming pool | £3220 |
| Cost to build a single storey extension | £42929 |
| Cost to build a side return extension | £49368 |
| Install an RSJ | £939 |
| Build an outbuilding | £2146 |
| Build a mansard loft conversion | £10732 |
| Cost of a loft conversion | £30050 |
| Build a kitchen extension | £10732 |
| Build a hip to gable loft conversion | £8049 |
| Build a granny annexe | £5366 |
| Build a garden office | £2146 |
| Convert a garage | £1073 |
| Build a new garage | £2146 |
| Build a flat roof extension | £1824 |
| Build a dormer loft conversion | £2146 |
| Lay a concrete foundation | £2146 |
| Convert a bungalow loft | £3220 |
| Basement conversion cost | £30050 |