From £1,648
Trusted and professional extension builder in BT66. Experienced in all extension buildering work and keeping within budget and on quote. The Method...
From £1,560
Power Construction is an established and experienced local extension builder in BT66. Please contact us for a free, no obligation quote and competi...
From £1,736
Experienced extension builder ready to quote for your work. Terry Design is the best extension builder in BT66. No obligation free quotes and many ...
From £1,840
With extensive extension buildering experience, we provide reliable, high-quality workmanship at competitive prices. G K Contracts Building & Joine...
From £1,600
T.I Building is a trusted extension builder serving customers in BT66 and the surrounding area. Contact us to today to get a competitive quote for ...
From £1,584
Relax... you have found a reliable extension builder in BT66. Finch Construction NI is a friendly and reliable company based in BT66 who consider n...
From £1,536
Trusted and professional extension builder in BT66. Experienced in all extension buildering work and keeping within budget and on quote. Belfast Lo...
From £1,376
Trusted and professional extension builder in BT66. Experienced in all extension buildering work and keeping within budget and on quote. Extended l...
From £1,336
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in BT66 it ranges from £1,336 (Mount Oriel Conversions & Extensions based in BT8) 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 BT66 by posting a job with HaMuch and we will send it to extension builders in BT66.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Waringstown | £23 | £167 |
| Install An RSJ near Craigavon | £23 | £181 |
| Install An RSJ near Maghaberry | £31 | £205 |
| Install An RSJ near Banbridge | £29 | £205 |
| Install An RSJ near Hillsborough and Culcavy | £25 | £170 |
| Install An RSJ near Lisburn | £24 | £164 |
| Install An RSJ near Crumlin | £26 | £194 |
| Install An RSJ near Coalisland | £27 | £223 |
| Install An RSJ near Carryduff | £23 | £158 |
| Install An RSJ near Ballynahinch | £19 | £189 |
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 - £16,998

Two storey extension - £87,246

Build a timber frame extension - £25,498

Build a swimming pool - £80,498

Single storey extension - £44,952

Side return extension - £35,848

Install an RSJ - £1,698

Outbuilding - £9,498

Build a Mansard loft conversion - £51,498

Loft conversion - £29,040

Build a kitchen extension - £41,498

Hip to gable loft conversion - £41,498

Granny annexe - £86,498

Garden office - £9,498

Convert a Garage - £15,498

Garage - £17,998

Build a flat roof extension - £21,498

Build a dormer loft conversion - £41,498

Concrete foundations - £5,748

Convert a bungalow loft - £28,498

Convert a basement - £31,848