Relax... you have found a reliable extension builder in Greenisland. SM Plumbing & Heating is a friendly and reliable company based in Greenisland ...
From £1,496
Ballantine building solutions is an established extension buildering business in Greenisland. We come highly recommended and provide competitive qu...
From £1,464
Trusted and professional extension builder in Greenisland. Experienced in all extension buildering work and keeping within budget and on quote. DGA...
From £1,584
Designco Ltd is an established extension buildering business in Greenisland. We come highly recommended and provide competitive quotes for your wor...
From £1,576
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 Greenisland it ranges from £1,464 (DGA based in BT37) 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 Greenisland by posting a job with HaMuch and we will send it to extension builders in Greenisland.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Greenisland | £23 | £153 |
| Install An RSJ near Carrickfergus | £23 | £158 |
| Install An RSJ near Holywood | £23 | £159 |
| Install An RSJ near Belfast | £23 | £161 |
| Install An RSJ near Ballyclare | £20 | £124 |
| Install An RSJ near Bangor | £24 | £183 |
| Install An RSJ near Bangor | £24 | £183 |
| Install An RSJ near Carryduff | £23 | £158 |
| Install An RSJ near Ballygowan | £24 | £183 |
| Install An RSJ near Larne | £15 | £122 |
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 - £16,838

Two storey extension - £87,006

Build a timber frame extension - £25,338

Build a swimming pool - £80,338

Single storey extension - £41,752

Side return extension - £34,048

Install an RSJ - £1,538

Outbuilding - £9,338

Build a Mansard loft conversion - £51,338

Loft conversion - £27,540

Build a kitchen extension - £41,338

Hip to gable loft conversion - £41,338

Granny annexe - £86,338

Garden office - £9,338

Convert a Garage - £15,338

Garage - £17,838

Build a flat roof extension - £21,338

Build a dormer loft conversion - £41,338

Concrete foundations - £5,588

Convert a bungalow loft - £28,338

Convert a basement - £30,048