Range from the cheapest £14.5 per hour and £125 per day (J s building & maintenance services limited based in B26) to the dearest £26 per hour and £250 per day (Low costi builders ltd based in B34).
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 B33
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| Job details | Estimate |
| Underpinning a house | £1406 |
| Build a two storey extension | £4687 |
| Build a timber frame extension | £4687 |
| Install a swimming pool | £2812 |
| Cost to build a single storey extension | £37498 |
| Cost to build a side return extension | £43123 |
| Install an RSJ | £820 |
| Build an outbuilding | £1875 |
| Build a mansard loft conversion | £9375 |
| Cost of a loft conversion | £26249 |
| Build a kitchen extension | £9375 |
| Build a hip to gable loft conversion | £7031 |
| Build a granny annexe | £4687 |
| Build a garden office | £1875 |
| Convert a garage | £937 |
| Build a flat roof extension | £1594 |
| Build a dormer loft conversion | £1875 |
| Lay a concrete foundation | £1875 |
| Convert a bungalow loft | £2812 |
| Basement conversion cost | £26249 |