From £1,832
We can take you dream into reality with our team of experienced tradesmen we cover every aspect of building and landscaping including plastering, e...
From £1,768
Land lord are here to help customers who need an Extension Builder in Harleston. We offer a competitive rate to complete all your extension builder...
From £1,864
This business has not added a description yet.
From £1,656
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,776
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,968
After 6 years as a member of the Which? Trusted Traders scheme D.A.Elias Builders are proud to receive our latest Certificate, ensuring we...
From £1,800
Relax... you have found a reliable extension builder in Harleston. 1st Class Building Services is a friendly and reliable company based in Harlesto...
From £1,680
Need an Extension Builder in Harleston? Bespoke Build Solutions has been helping local clients (20 mile radius) with their extension buildering job...
From £1,672
Need an Extension Builder in Harleston? Heritage Construction Norfolk has been helping local clients (20 mile radius) with their extension builderi...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Harleston it ranges from £1,656 (J Kimbley Building & Landscaping based in NR2) to £1,968 (D.A. Elias Builders based in IP12).
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 Harleston by posting a job with HaMuch and we will send it to extension builders in Harleston.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Waveney | £24 | £200 |
| Install An RSJ near Norwich | £25 | £200 |
| Install An RSJ near Lowestoft | £24 | £197 |
| Install An RSJ near Stowmarket | £30 | £221 |
| Install An RSJ near Suffolk Coastal | £28 | £215 |
| Install An RSJ near Gorleston-on-Sea | £25 | £205 |
| Install An RSJ near Broadland | £24 | £194 |
| Install An RSJ near Breckland | £28 | £248 |
| Install An RSJ near Thetford | £42 | £277 |
| Install An RSJ near Great Yarmouth | £13 | £132 |
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,090

Two storey extension - £87,386

Build a timber frame extension - £25,590

Build a swimming pool - £80,590

Single storey extension - £46,808

Side return extension - £36,892

Install an RSJ - £1,790

Outbuilding - £9,590

Build a Mansard loft conversion - £51,590

Loft conversion - £29,910

Build a kitchen extension - £41,590

Hip to gable loft conversion - £41,590

Granny annexe - £86,590

Garden office - £9,590

Convert a Garage - £15,590

Garage - £18,090

Build a flat roof extension - £21,590

Build a dormer loft conversion - £41,590

Concrete foundations - £5,840

Convert a bungalow loft - £28,590

Convert a basement - £32,892