From £1,984
JP&S Construction Ltd is an established extension buildering business in BT80. We come highly recommended and provide competitive quotes for your w...
From £2,104
FJS CONTRACTS LTD are here to help customers who need an Extension Builder in BT80. We offer a competitive rate to complete all your extension buil...
From £1,496
Been in business as 18 years alway put clients first and never had any combacks
From £2,216
Seamus Mcmullan building and joinery is an established extension buildering business in BT80. We come highly recommended and provide competitive qu...
From £2,216
Need to find an Extension Builder near you for all your extension buildering work?
GMC Construction provides a local, trusted extension bui...
From £1,632
We have over 25 years experience in all building work and renowned for good workmanship All jobs small and large taken on
From £1,736
Experienced extension builder ready to quote for your work. Terry Design is the best extension builder in BT80. No obligation free quotes and many ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in BT80 it ranges from £1,496 (Oakmore Contracts based in BT45) to £2,216 (Seamus Mcmullan building and joinery based in BT45).
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 BT80 by posting a job with HaMuch and we will send it to extension builders in BT80.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Coalisland | £21 | £173 |
| Install An RSJ near Magherafelt | £25 | £200 |
| Install An RSJ near Dungannon | £23 | £186 |
| Install An RSJ near Craigavon | £22 | £170 |
| Install An RSJ near Dungiven | £21 | £179 |
| Install An RSJ near Crumlin | £22 | £168 |
| Install An RSJ near Waringstown | £21 | £146 |
| Install An RSJ near Maghaberry | £27 | £175 |
| Install An RSJ near Coleraine | £21 | £181 |
| Install An RSJ near Hillsborough and Culcavy | £21 | £141 |
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 - £17,212

Two storey extension - £87,568

Build a timber frame extension - £25,712

Build a swimming pool - £80,712

Single storey extension - £49,240

Side return extension - £38,260

Install an RSJ - £1,912

Outbuilding - £9,712

Build a Mansard loft conversion - £51,712

Loft conversion - £31,050

Build a kitchen extension - £41,712

Hip to gable loft conversion - £41,712

Granny annexe - £86,712

Garden office - £9,712

Convert a Garage - £15,712

Garage - £18,212

Build a flat roof extension - £21,712

Build a dormer loft conversion - £41,712

Concrete foundations - £5,962

Convert a bungalow loft - £28,712

Convert a basement - £34,260