RSJ cost in DN21
RSJs support your new extension or other construction to ensure that your property is structurally sound. They are crucial parts of your building work that mustn't be ignored, and must be installed by a professional.
How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in DN21 it ranges from £1400 (Bespoke Renovations based in DN15) to £2080 (Random Stone Construction based in S81).
Comparing extension builders estimates for fitting an RSJ gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get rates and quotes to install an RSJ in DN21 by posting a job with HaMuch and we will send it to extension builders in DN21.
Estimates for common extension builder jobs in DN21;
| Job | Estimate |
| Underpinning a house | £17039 |
| Build a two storey extension | £87309 |
| Build a timber frame extension | £25539 |
| Install a swimming pool | £80539 |
| Cost to build a single storey extension | £40784 |
| Cost to build a side return extension | £32316 |
| Install an RSJ | £1739 |
| Build an outbuilding | £9539 |
| Build a mansard loft conversion | £51539 |
| Cost of a loft conversion | £29430 |
| Build a kitchen extension | £41539 |
| Build a hip to gable loft conversion | £41539 |
| Build a granny annexe | £86539 |
| Build a garden office | £9539 |
| Convert a garage | £15539 |
| Build a new garage | £18039 |
| Build a flat roof extension | £21539 |
| Build a dormer loft conversion | £41539 |
| Lay a concrete foundation | £5789 |
| Convert a bungalow loft | £28539 |
| Basement conversion cost | £32316 |