From £1,712
Trusted and professional extension builder in FY1. Experienced in all extension buildering work and keeping within budget and on quote. Lords have ...
From £1,912
Smedley Construction Ltd is a trusted extension builder serving customers in FY1 and the surrounding area. Contact us to today to get a competitive...
From £1,832
TECH BUILDING limited is an established extension buildering business in FY1. We come highly recommended and provide competitive quotes for your wo...
From £1,776
Tekton Construction NW is an established extension buildering business in FY1. We come highly recommended and provide competitive quotes for your w...
From £2,048
Relax... you have found a reliable extension builder in FY1. Green Generation Builders Ltd is a friendly and reliable company based in FY1 who cons...
From £1,856
Broadfield construction is a trusted extension builder serving customers in FY1 and the surrounding area. Contact us to today to get a competitive ...
From £1,984
Fortis Construction & Development is a trusted extension builder serving customers in FY1 and the surrounding area. Contact us to today to get a co...
From £2,096
Experienced extension builder ready to quote for your work. George Hill & Sons is the best extension builder in FY1. No obligation free quotes and ...
From £2,024
We do it all from plan to completion
25 yrs and no complaints ..
modern and contemporary
kitchen bathrooms

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in FY1 it ranges from £1,712 (Lords based in FY1) to £2,096 (George Hill & Sons 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 FY1 by posting a job with HaMuch and we will send it to extension builders in FY1.
"RSJ installation" - FY3
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Blackpool | £29 | £209 |
| Install An RSJ near Lytham St Annes | £28 | £206 |
| Install An RSJ near Fleetwood | £28 | £206 |
| Install An RSJ near Southport | £27 | £198 |
| Install An RSJ near Penwortham | £30 | £218 |
| Install An RSJ near Fulwood | £31 | £217 |
| Install An RSJ near Preston | £30 | £219 |
| Install An RSJ near Leyland | £31 | £223 |
| Install An RSJ near Bamber Bridge | £30 | £217 |
| Install An RSJ near Formby | £23 | £162 |
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 - £17,204

Two storey extension - £87,556

Build a timber frame extension - £25,704

Build a swimming pool - £80,704

Single storey extension - £49,080

Side return extension - £38,170

Install an RSJ - £1,904

Outbuilding - £9,704

Build a Mansard loft conversion - £51,704

Loft conversion - £30,975

Build a kitchen extension - £41,704

Hip to gable loft conversion - £41,704

Granny annexe - £86,704

Garden office - £9,704

Convert a Garage - £15,704

Garage - £18,204

Build a flat roof extension - £21,704

Build a dormer loft conversion - £41,704

Concrete foundations - £5,954

Convert a bungalow loft - £28,704

Convert a basement - £34,170