T.I Building is a trusted extension builder serving customers in BT28 and the surrounding area. Contact us to today to get a competitive quote for ...
From £1,536
Trusted and professional extension builder in BT28. Experienced in all extension buildering work and keeping within budget and on quote. Belfast Lo...
From £1,584
Relax... you have found a reliable extension builder in BT28. Finch Construction NI is a friendly and reliable company based in BT28 who consider n...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in BT28 it ranges from £1,536 (Belfast Loft Company based in BT17) to £1,600 (T.I Building based in BT28).
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 BT28 by posting a job with HaMuch and we will send it to extension builders in BT28.
"RSJ installation" - BT17, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Lisburn | £24 | £164 |
| Install An RSJ near Hillsborough and Culcavy | £25 | £170 |
| Install An RSJ near Maghaberry | £31 | £205 |
| Install An RSJ near Carryduff | £23 | £158 |
| Install An RSJ near Crumlin | £26 | £194 |
| Install An RSJ near Belfast | £23 | £161 |
| Install An RSJ near Waringstown | £23 | £167 |
| Install An RSJ near Saintfield | £23 | £162 |
| Install An RSJ near Ballynahinch | £19 | £189 |
| 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 - £16,873

Two storey extension - £87,060

Build a timber frame extension - £25,373

Build a swimming pool - £80,373

Single storey extension - £42,467

Side return extension - £34,450

Install an RSJ - £1,573

Outbuilding - £9,373

Build a Mansard loft conversion - £51,373

Loft conversion - £27,875

Build a kitchen extension - £41,373

Hip to gable loft conversion - £41,373

Granny annexe - £86,373

Garden office - £9,373

Convert a Garage - £15,373

Garage - £17,873

Build a flat roof extension - £21,373

Build a dormer loft conversion - £41,373

Concrete foundations - £5,623

Convert a bungalow loft - £28,373

Convert a basement - £30,450