From £1,832
For all your needs. If you need to install an rsj contact us today to get a no obligation free quote.
From £1,912
If you need to install an rsj use an Extension Builder. Work is guarenteed and the cost won't hurt the pocket.
From £2,048
You want to install an rsj? No problem, an Extension Builder is a reliable extension builder with years of experience helping homeowners.
From £1,776
For all your needs. If you need to install an rsj contact us today to get a no obligation free quote.
From £2,024
We do it all from plan to completion
25 yrs and no complaints ..
modern and contemporary
kitchen bathrooms
From £2,096
Need a install an rsj? an Extension Builder is competitively priced and quick to quote.
From £1,848
For all your needs. If you need to install an rsj contact us today to get a no obligation free quote.
From £1,856
If you need to install an rsj use an Extension Builder. Work is guarenteed and the cost won't hurt the pocket.
From £1,984
If you need to install an rsj use an Extension Builder. Work is guarenteed and the cost won't hurt the pocket.
From £1,744
A service with a difference. Priced competitively to install an rsj and more.
From £1,848
If you need to install an rsj use an Extension Builder. Work is guarenteed and the cost won't hurt the pocket.
From £2,144
JR roofing Lancs Limited is a family-run roofing contractor based in Blackpool, Lancashire. We pride ourselves on our excellent customer service an...
From £2,032
If you need to install an rsj use an Extension Builder. Work is guarenteed and the cost won't hurt the pocket.
From £1,696
To install an rsj in FY3 we are a reliable and competitive extension builder. Expert service guaranteed.
From £2,016
A service with a difference. Priced competitively to install an rsj and more.
From £1,736
A friendly extension builder in FY3. Happy to provide references and a free quote to install an rsj.
From £1,984
You want to install an rsj? No problem, an Extension Builder is a reliable extension builder with years of experience helping homeowners.
From £1,880
Ibuild Design & Build is a Blackpool based building and home improvement company providing quality home improvements for proud homeowners across La...
From £1,840
A friendly extension builder in FY3. Happy to provide references and a free quote to install an rsj.
From £2,104
Our building services company NPD Builders have thirty years’ experience and have been helping customers in Preston and the surrounding area by p...
From £2,056
S.G. Joinery & Building is a well-established company setup over 15 years ago and working in the Poulton-le-Fylde , Preston ,Garstang and ...
From £1,904
Need a install an rsj? an Extension Builder is competitively priced and quick to quote.

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in FY3 it ranges from £1,696 (M S JOINERY & BUILDING based in FY5) to £2,144 (JR Roofing Lancs based in FY4).
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 FY3 by posting a job with HaMuch and we will send it to extension builders in FY3.
"RSJ installation" - FY3
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Blackpool | £25 | £183 |
| Install An RSJ near Lytham St Annes | £25 | £181 |
| Install An RSJ near Fleetwood | £25 | £180 |
| Install An RSJ near Penwortham | £26 | £189 |
| Install An RSJ near Fulwood | £26 | £187 |
| Install An RSJ near Southport | £23 | £174 |
| Install An RSJ near Preston | £26 | £190 |
| Install An RSJ near Leyland | £27 | £194 |
| Install An RSJ near Bamber Bridge | £26 | £189 |
| Install An RSJ near Lancaster | £22 | £185 |
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 - £17,203

Two storey extension - £87,554

Build a timber frame extension - £25,703

Build a swimming pool - £80,703

Single storey extension - £49,054

Side return extension - £38,156

Install an RSJ - £1,903

Outbuilding - £9,703

Build a Mansard loft conversion - £51,703

Loft conversion - £30,963

Build a kitchen extension - £41,703

Hip to gable loft conversion - £41,703

Granny annexe - £86,703

Garden office - £9,703

Convert a Garage - £15,703

Garage - £18,203

Build a flat roof extension - £21,703

Build a dormer loft conversion - £41,703

Concrete foundations - £5,953

Convert a bungalow loft - £28,703

Convert a basement - £34,156