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N W Doyle & Son is a trusted extension builder serving customers in Castlewellan and the surrounding area. Contact us to today to get a competitive...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Castlewellan it ranges from £1,712 (N W Doyle & Son based in BT24) to £1,712 (N W Doyle & Son based in BT24).
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 Castlewellan by posting a job with HaMuch and we will send it to extension builders in Castlewellan.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Ballynahinch | £19 | £189 |
| Install An RSJ near Banbridge | £29 | £205 |
| Install An RSJ near Saintfield | £23 | £162 |
| Install An RSJ near Hillsborough and Culcavy | £25 | £170 |
| Install An RSJ near Kilkeel | £28 | £182 |
| Install An RSJ near Lisburn | £24 | £164 |
| Install An RSJ near Waringstown | £23 | £167 |
| Install An RSJ near Maghaberry | £31 | £205 |
| Install An RSJ near Carryduff | £23 | £158 |
| Install An RSJ near Portaferry | £22 | £164 |
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 - £17,012

Two storey extension - £87,268

Build a timber frame extension - £25,512

Build a swimming pool - £80,512

Single storey extension - £45,240

Side return extension - £36,010

Install an RSJ - £1,712

Outbuilding - £9,512

Build a Mansard loft conversion - £51,512

Loft conversion - £29,175

Build a kitchen extension - £41,512

Hip to gable loft conversion - £41,512

Granny annexe - £86,512

Garden office - £9,512

Convert a Garage - £15,512

Garage - £18,012

Build a flat roof extension - £21,512

Build a dormer loft conversion - £41,512

Concrete foundations - £5,762

Convert a bungalow loft - £28,512

Convert a basement - £32,010