From £2,200
Experienced extension builder ready to quote for your work. Home Ryte Construction is the best extension builder in NN8. No obligation free quotes ...
From £3,592
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,184
Experienced extension builder ready to quote for your work. MINERAL STAR CONSTRUCTION LTD is the best extension builder in NN8. No obligation free ...
From £2,160
Trusted and professional extension builder in NN8. Experienced in all extension buildering work and keeping within budget and on quote. Captain Sto...
From £1,824
Garden and Building Solutions is an established and experienced local extension builder in NN8. Please contact us for a free, no obligation quote a...
From £1,848
Need to find an Extension Builder near you for all your extension buildering work?
Shirley Ceramics provides a local, trusted extension bui...
From £2,240
Experienced extension builder ready to quote for your work. KMR CONSTRUCTION is the best extension builder in NN8. No obligation free quotes and ma...
From £1,896
Experienced extension builder ready to quote for your work. L & D CONSTRUCTION SERVICE is the best extension builder in NN8. No obligation free quo...
From £2,112
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 NN8 it ranges from £1,824 (Garden and Building Solutions based in NN10) to £3,592 (STRANDOR ROOFING LTD based in NN6).
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 NN8 by posting a job with HaMuch and we will send it to extension builders in NN8.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Wellingborough | £39 | £251 |
| Install An RSJ near Rushden | £34 | £231 |
| Install An RSJ near Kettering | £34 | £237 |
| Install An RSJ near Northampton | £35 | £240 |
| Install An RSJ near Corby | £30 | £214 |
| Install An RSJ near Bedford | £45 | £278 |
| Install An RSJ near South Bedfordshire | £45 | £278 |
| Install An RSJ near Market Harborough | £31 | £217 |
| Install An RSJ near Kempston | £44 | £273 |
| Install An RSJ near Milton Keynes | £39 | £263 |
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 - £17,514

Two storey extension - £88,020

Build a timber frame extension - £26,014

Build a swimming pool - £81,014

Single storey extension - £55,272

Side return extension - £41,653

Install an RSJ - £2,214

Outbuilding - £10,014

Build a Mansard loft conversion - £52,014

Loft conversion - £33,878

Build a kitchen extension - £42,014

Hip to gable loft conversion - £42,014

Granny annexe - £87,014

Garden office - £10,014

Convert a Garage - £16,014

Garage - £18,514

Build a flat roof extension - £22,014

Build a dormer loft conversion - £42,014

Concrete foundations - £6,264

Convert a bungalow loft - £29,014

Convert a basement - £37,653