Extension builder estimates (based on hourly rates) to build a single storey extension in WD3
Range from the cheapest single storey extension £46800 (Swan Windows & Son Limited based in WD3) to the dearest single storey extension £90000 (Design & Build Builders Ltd based in WD18).
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 WD3 by posting a job with HaMuch and we will send it to extension builders in WD3.
Estimates for common extension builder jobs in WD3;
| Job | Estimate |
| Underpinning a house | £17532 |
| Build a two storey extension | £88048 |
| Build a timber frame extension | £26032 |
| Install a swimming pool | £81032 |
| Cost to build a single storey extension | £50640 |
| Cost to build a side return extension | £37860 |
| Install an RSJ | £2232 |
| Build an outbuilding | £10032 |
| Build a mansard loft conversion | £52032 |
| Cost of a loft conversion | £34050 |
| Build a kitchen extension | £42032 |
| Build a hip to gable loft conversion | £42032 |
| Build a granny annexe | £87032 |
| Build a garden office | £10032 |
| Convert a garage | £16032 |
| Build a new garage | £18532 |
| Build a flat roof extension | £22032 |
| Build a dormer loft conversion | £42032 |
| Lay a concrete foundation | £6282 |
| Convert a bungalow loft | £29032 |
| Basement conversion cost | £37860 |