From £1,536
Trusted and professional extension builder in Crumlin. Experienced in all extension buildering work and keeping within budget and on quote. Belfast...
From £1,584
Relax... you have found a reliable extension builder in Crumlin. Finch Construction NI is a friendly and reliable company based in Crumlin who cons...
From £1,576
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,376
Trusted and professional extension builder in Crumlin. Experienced in all extension buildering work and keeping within budget and on quote. Extende...
From £1,600
T.I Building is a trusted extension builder serving customers in Crumlin and the surrounding area. Contact us to today to get a competitive quote f...
From £1,584
Designco Ltd is an established extension buildering business in Crumlin. We come highly recommended and provide competitive quotes for your work.
From £1,568
Relax... you have found a reliable extension builder in Crumlin. SM Plumbing & Heating is a friendly and reliable company based in Crumlin who cons...
From £1,496
Ballantine building solutions is an established extension buildering business in Crumlin. We come highly recommended and provide competitive quotes...
From £1,464
Trusted and professional extension builder in Crumlin. Experienced in all extension buildering work and keeping within budget and on quote. DGA hav...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Crumlin it ranges from £1,376 (Extended living by Gilbert-Ash based in BT12) 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 - £16,954

Two storey extension - £87,182

Build a timber frame extension - £25,454

Build a swimming pool - £80,454

Single storey extension - £44,088

Side return extension - £35,362

Install an RSJ - £1,654

Outbuilding - £9,454

Build a Mansard loft conversion - £51,454

Loft conversion - £28,635

Build a kitchen extension - £41,454

Hip to gable loft conversion - £41,454

Granny annexe - £86,454

Garden office - £9,454

Convert a Garage - £15,454

Garage - £17,954

Build a flat roof extension - £21,454

Build a dormer loft conversion - £41,454

Concrete foundations - £5,704

Convert a bungalow loft - £28,454

Convert a basement - £31,362