Extension builder estimates (based on hourly rates) to build a single storey extension in Carmarthenshire
Range from the cheapest single storey extension £29200 (R i daniels based in SA14) to the dearest single storey extension £58000 (KD Construction based in SA15).
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 Carmarthenshire by posting a job with HaMuch and we will send it to extension builders in Carmarthenshire.
Estimates for common extension builder jobs in Carmarthenshire;
| Job | Estimate |
| Underpinning a house | £17019 |
| Build a two storey extension | £87279 |
| Build a timber frame extension | £25519 |
| Install a swimming pool | £80519 |
| Cost to build a single storey extension | £40387 |
| Cost to build a side return extension | £32093 |
| Install an RSJ | £1719 |
| Build an outbuilding | £9519 |
| Build a mansard loft conversion | £51519 |
| Cost of a loft conversion | £29244 |
| Build a kitchen extension | £41519 |
| Build a hip to gable loft conversion | £41519 |
| Build a granny annexe | £86519 |
| Build a garden office | £9519 |
| Convert a garage | £15519 |
| Build a flat roof extension | £21519 |
| Build a dormer loft conversion | £41519 |
| Lay a concrete foundation | £5769 |
| Convert a bungalow loft | £28519 |
| Basement conversion cost | £32093 |