From £1,536
Trusted and professional extension builder in Crumlin. Experienced in all extension buildering work and keeping within budget and on quote. Belfast...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Crumlin it ranges from £1,536 (Belfast Loft Company based in BT17) to £2,760 (Build a Boiler based in BT67).
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 Crumlin by posting a job with HaMuch and we will send it to extension builders in Crumlin.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Crumlin | £26 | £194 |
| Install An RSJ near Maghaberry | £31 | £205 |
| Install An RSJ near Lisburn | £24 | £164 |
| Install An RSJ near Hillsborough and Culcavy | £25 | £170 |
| Install An RSJ near Belfast | £23 | £161 |
| Install An RSJ near Ballyclare | £20 | £124 |
| Install An RSJ near Carryduff | £23 | £158 |
| Install An RSJ near Waringstown | £23 | £167 |
| Install An RSJ near Greenisland | £23 | £153 |
| Install An RSJ near Holywood | £23 | £159 |
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 - £17,448

Two storey extension - £87,922

Build a timber frame extension - £25,948

Build a swimming pool - £80,948

Single storey extension - £53,960

Side return extension - £40,915

Install an RSJ - £2,148

Outbuilding - £9,948

Build a Mansard loft conversion - £51,948

Loft conversion - £33,263

Build a kitchen extension - £41,948

Hip to gable loft conversion - £41,948

Granny annexe - £86,948

Garden office - £9,948

Convert a Garage - £15,948

Garage - £18,448

Build a flat roof extension - £21,948

Build a dormer loft conversion - £41,948

Concrete foundations - £6,198

Convert a bungalow loft - £28,948

Convert a basement - £36,915