Extension builder estimates (based on hourly rates) to build a single storey extension in SE21
Range from the cheapest single storey extension £42000 (RCB Group Design & Build based in SE21) to the dearest single storey extension £58000 (Buci builders ltd based in SE27).
Comparing extension builders estimates for fitting a downstairs toilet 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 - Get rates and quotes to build a single storey extension in SE21 by posting a job with HaMuch and we will send it to extension builders in SE21.
Estimates for common extension builder jobs in SE21;
| Job | Estimate |
| Underpinning a house | £17408 |
| Build a two storey extension | £87862 |
| Build a timber frame extension | £25908 |
| Install a swimming pool | £80908 |
| Cost to build a single storey extension | £48163 |
| Cost to build a side return extension | £36467 |
| Install an RSJ | £2108 |
| Build an outbuilding | £9908 |
| Build a mansard loft conversion | £51908 |
| Cost of a loft conversion | £32889 |
| Build a kitchen extension | £41908 |
| Build a hip to gable loft conversion | £41908 |
| Build a granny annexe | £86908 |
| Build a garden office | £9908 |
| Convert a garage | £15908 |
| Build a new garage | £18408 |
| Build a flat roof extension | £21908 |
| Build a dormer loft conversion | £41908 |
| Lay a concrete foundation | £6158 |
| Convert a bungalow loft | £28908 |
| Basement conversion cost | £36467 |