DEREK REES BUILDING MAINTENANC is an established extension buildering business in LD3. We come highly recommended and provide competitive quotes fo...
From £1,944
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 LD3 it ranges from £1,840 (DEREK REES BUILDING MAINTENANC based in LD3) to £1,944 (SEER CONSTRUCTION LTD based in LD3).
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 LD3 by posting a job with HaMuch and we will send it to extension builders in LD3.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Tredegar | £30 | £217 |
| Install An RSJ near Ebbw Vale | £30 | £217 |
| Install An RSJ near Merthyr Tydfil | £33 | £220 |
| Install An RSJ near Aberdare | £32 | £212 |
| Install An RSJ near Rhondda, Cynon, Taff | £31 | £209 |
| Install An RSJ near Pontypool | £30 | £210 |
| Install An RSJ near Rhondda | £31 | £206 |
| Install An RSJ near Neath Port Talbot | £31 | £224 |
| Install An RSJ near Pontypridd | £33 | £211 |
| Install An RSJ near Cwmbran | £43 | £219 |
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 - £17,192

Two storey extension - £87,538

Build a timber frame extension - £25,692

Build a swimming pool - £80,692

Single storey extension - £48,840

Side return extension - £38,035

Install an RSJ - £1,892

Outbuilding - £9,692

Build a Mansard loft conversion - £51,692

Loft conversion - £30,863

Build a kitchen extension - £41,692

Hip to gable loft conversion - £41,692

Granny annexe - £86,692

Garden office - £9,692

Convert a Garage - £15,692

Garage - £18,192

Build a flat roof extension - £21,692

Build a dormer loft conversion - £41,692

Concrete foundations - £5,942

Convert a bungalow loft - £28,692

Convert a basement - £34,035