Cost of a two storey extension in B21
A two storey extension is a great way to add extra space to your home, adding value to your property. But how much does it cost to build a double storey extension in B21?
Costs range from £86440 (FIVE OAKS BUILDING LTD based in DY4) to £89200 (TG Building Services & Son based in B71), but these are just estimates. The best way to compare costs is to get real quotes from real builders.
Post your job on HaMuch and we'll send it to extension builders to B21.
Estimates for common extension builder jobs in B21;
| Job | Estimate |
| Underpinning a house | £17124 |
| Build a two storey extension | £87436 |
| Build a timber frame extension | £25624 |
| Install a swimming pool | £80624 |
| Cost to build a single storey extension | £42486 |
| Cost to build a side return extension | £33274 |
| Install an RSJ | £1824 |
| Build an outbuilding | £9624 |
| Build a mansard loft conversion | £51624 |
| Cost of a loft conversion | £30228 |
| Build a kitchen extension | £41624 |
| Build a hip to gable loft conversion | £41624 |
| Build a granny annexe | £86624 |
| Build a garden office | £9624 |
| Convert a garage | £15624 |
| Build a new garage | £18124 |
| Build a flat roof extension | £21624 |
| Build a dormer loft conversion | £41624 |
| Lay a concrete foundation | £5874 |
| Convert a bungalow loft | £28624 |
| Basement conversion cost | £33274 |