From £1,176
larne, BT40
Have worked in building industry for over 30 years contracts from government to private sector.
From £1,464
Trusted and professional extension builder in Larne. Experienced in all extension buildering work and keeping within budget and on quote. DGA have ...
From £1,496
Ballantine building solutions is an established extension buildering business in Larne. We come highly recommended and provide competitive quotes f...
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 £1,584
Designco Ltd is an established extension buildering business in Larne. We come highly recommended and provide competitive quotes for your work.
...From £1,568
Relax... you have found a reliable extension builder in Larne. SM Plumbing & Heating is a friendly and reliable company based in Larne who consider...
From £1,408
Need an Extension Builder in Larne? MIRKOW has been helping local clients (20 mile radius) with their extension buildering jobs for many years. Get...
From £1,552
Need to find an Extension Builder near you for all your extension buildering work?
Firenstack Solutions provides a local, trusted extension...
From £1,376
Trusted and professional extension builder in Larne. Experienced in all extension buildering work and keeping within budget and on quote. Extended ...
From £1,480
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Larne it ranges from £1,176 (Anak based in BT40) to £1,584 (Designco Ltd based in BT36).
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 Larne by posting a job with HaMuch and we will send it to extension builders in Larne.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Larne | £15 | £122 |
| Install An RSJ near Carrickfergus | £23 | £158 |
| Install An RSJ near Ballyclare | £20 | £124 |
| Install An RSJ near Greenisland | £23 | £153 |
| Install An RSJ near Holywood | £23 | £159 |
| Install An RSJ near Bangor | £24 | £183 |
| Install An RSJ near Bangor | £24 | £183 |
| Install An RSJ near Belfast | £23 | £161 |
| Install An RSJ near Ballygowan | £24 | £183 |
| Install An RSJ near Comber | £22 | £160 |
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 - £16,768

Two storey extension - £86,902

Build a timber frame extension - £25,268

Build a swimming pool - £80,268

Single storey extension - £40,360

Side return extension - £33,265

Install an RSJ - £1,468

Outbuilding - £9,268

Build a Mansard loft conversion - £51,268

Loft conversion - £26,888

Build a kitchen extension - £41,268

Hip to gable loft conversion - £41,268

Granny annexe - £86,268

Garden office - £9,268

Convert a Garage - £15,268

Garage - £17,768

Build a flat roof extension - £21,268

Build a dormer loft conversion - £41,268

Concrete foundations - £5,518

Convert a bungalow loft - £28,268

Convert a basement - £29,265