B GS GENERAL BUILDERS are here to help customers who need an Extension Builder in NN17. We offer a competitive rate to complete all your extension ...
From £1,672
Ascot Property Solutions Limited is an established and experienced local extension builder in NN17. Please contact us for a free, no obligation quo...
From £1,776
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in NN17 it ranges from £1,672 (Ascot Property Solutions Limited based in NN17) to £1,856 (B GS GENERAL BUILDERS based in NN17).
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 NN17 by posting a job with HaMuch and we will send it to extension builders in NN17.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Corby | £30 | £214 |
| Install An RSJ near Kettering | £34 | £237 |
| Install An RSJ near Market Harborough | £31 | £217 |
| Install An RSJ near Wellingborough | £39 | £251 |
| Install An RSJ near Stamford | £35 | £248 |
| Install An RSJ near Rushden | £34 | £231 |
| Install An RSJ near Wigston | £28 | £209 |
| Install An RSJ near Hamilton | £29 | £213 |
| Install An RSJ near Peterborough | £40 | £281 |
| Install An RSJ near Oadby | £28 | £207 |
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 - £17,068

Two storey extension - £87,352

Build a timber frame extension - £25,568

Build a swimming pool - £80,568

Single storey extension - £46,360

Side return extension - £36,640

Install an RSJ - £1,768

Outbuilding - £9,568

Build a Mansard loft conversion - £51,568

Loft conversion - £29,700

Build a kitchen extension - £41,568

Hip to gable loft conversion - £41,568

Granny annexe - £86,568

Garden office - £9,568

Convert a Garage - £15,568

Garage - £18,068

Build a flat roof extension - £21,568

Build a dormer loft conversion - £41,568

Concrete foundations - £5,818

Convert a bungalow loft - £28,568

Convert a basement - £32,640