Extension builder estimates (based on hourly rates) to build a single storey extension in HP3
Range from the cheapest single storey extension £11600 (Hertfordshire brickwork based in Hp1) to the dearest single storey extension £58000 (Absolute kitchen and bathroom based in HP3).
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 HP3 by posting a job with HaMuch and we will send it to extension builders in HP3.
Estimates for common extension builder jobs in HP3;
| Job | Estimate |
| Underpinning a house | £17348 |
| Build a two storey extension | £87772 |
| Build a timber frame extension | £25848 |
| Install a swimming pool | £80848 |
| Cost to build a single storey extension | £46954 |
| Cost to build a side return extension | £35786 |
| Install an RSJ | £2048 |
| Build an outbuilding | £9848 |
| Build a mansard loft conversion | £51848 |
| Cost of a loft conversion | £32322 |
| Build a kitchen extension | £41848 |
| Build a hip to gable loft conversion | £41848 |
| Build a granny annexe | £86848 |
| Build a garden office | £9848 |
| Convert a garage | £15848 |
| Build a new garage | £18348 |
| Build a flat roof extension | £21848 |
| Build a dormer loft conversion | £41848 |
| Lay a concrete foundation | £6098 |
| Convert a bungalow loft | £28848 |
| Basement conversion cost | £35786 |