Range from the cheapest £18 per hour and £150 per day (T & J Builders based in NR6) to the dearest £27 per hour and £198 per day (GT Carpentry & Building based in IP14).
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.
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See table for all Extension Builder rates in Harleston
| Job details | Estimate |
| Underpinning a house | £1292 |
| Build a two storey extension | £4307 |
| Build a timber frame extension | £4307 |
| Install a swimming pool | £2584 |
| Cost to build a single storey extension | £34460 |
| Cost to build a side return extension | £39629 |
| Install an RSJ | £754 |
| Build an outbuilding | £1723 |
| Build a mansard loft conversion | £8615 |
| Cost of a loft conversion | £24122 |
| Build a kitchen extension | £8615 |
| Build a hip to gable loft conversion | £6461 |
| Build a granny annexe | £4307 |
| Build a garden office | £1723 |
| Convert a garage | £861 |
| Build a new garage | £1723 |
| Build a flat roof extension | £1465 |
| Build a dormer loft conversion | £1723 |
| Lay a concrete foundation | £1723 |
| Convert a bungalow loft | £2584 |
| Basement conversion cost | £24122 |