From £2,024
We do it all from plan to completion
25 yrs and no complaints ..
modern and contemporary
kitchen bathrooms
From £1,744
Need to find an Extension Builder near you for all your extension buildering work?
Poulton Building & Joinery Services provides a local, tr...
From £1,696
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,832
TECH BUILDING limited is an established extension buildering business in FY2. We come highly recommended and provide competitive quotes for your wo...
From £1,848
Interbuild is an established extension buildering business in FY2. We come highly recommended and provide competitive quotes for your work.
From £1,712
Trusted and professional extension builder in FY2. 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 FY2 and the surrounding area. Contact us to today to get a competitive...
From £1,848
JSM BUILDING SOLUTIONS LIMITED is a trusted extension builder serving customers in FY2 and the surrounding area. Contact us to today to get a compe...
From £2,048
Relax... you have found a reliable extension builder in FY2. Green Generation Builders Ltd is a friendly and reliable company based in FY2 who cons...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in FY2 it ranges from £1,696 (M S JOINERY & BUILDING based in FY5) to £2,048 (Green Generation Builders Ltd based in FY3).
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 FY2 by posting a job with HaMuch and we will send it to extension builders in FY2.
"RSJ installation" - FY3, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Blackpool | £29 | £209 |
| Install An RSJ near Fleetwood | £28 | £206 |
| Install An RSJ near Lytham St Annes | £28 | £206 |
| Install An RSJ near Fulwood | £31 | £217 |
| Install An RSJ near Penwortham | £30 | £218 |
| Install An RSJ near Preston | £30 | £219 |
| Install An RSJ near Southport | £27 | £198 |
| Install An RSJ near Lancaster | £25 | £211 |
| Install An RSJ near Morecambe | £25 | £212 |
| Install An RSJ near Bamber Bridge | £30 | £217 |
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 - £17,146

Two storey extension - £87,470

Build a timber frame extension - £25,646

Build a swimming pool - £80,646

Single storey extension - £47,928

Side return extension - £37,522

Install an RSJ - £1,846

Outbuilding - £9,646

Build a Mansard loft conversion - £51,646

Loft conversion - £30,435

Build a kitchen extension - £41,646

Hip to gable loft conversion - £41,646

Granny annexe - £86,646

Garden office - £9,646

Convert a Garage - £15,646

Garage - £18,146

Build a flat roof extension - £21,646

Build a dormer loft conversion - £41,646

Concrete foundations - £5,896

Convert a bungalow loft - £28,646

Convert a basement - £33,522