From £1,464
Trusted and professional extension builder in Carrickfergus. Experienced in all extension buildering work and keeping within budget and on quote. D...
From £1,496
Ballantine building solutions is an established extension buildering business in Carrickfergus. We come highly recommended and provide competitive ...
From £1,584
Designco Ltd is an established extension buildering business in Carrickfergus. We come highly recommended and provide competitive quotes for your w...
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 £1,176
Have worked in building industry for over 30 years contracts from government to private sector.
From £1,568
Relax... you have found a reliable extension builder in Carrickfergus. SM Plumbing & Heating is a friendly and reliable company based in Carrickfer...
From £1,376
Trusted and professional extension builder in Carrickfergus. Experienced in all extension buildering work and keeping within budget and on quote. E...
From £1,536
Trusted and professional extension builder in Carrickfergus. Experienced in all extension buildering work and keeping within budget and on quote. B...
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 Carrickfergus it ranges from £1,176 (Anak based in BT40) to £1,688 (AK Building Services based in BT8).
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 Carrickfergus by posting a job with HaMuch and we will send it to extension builders in Carrickfergus.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Carrickfergus | £23 | £158 |
| 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 Larne | £15 | £122 |
| Install An RSJ near Ballyclare | £20 | £124 |
| 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 - £16,780

Two storey extension - £86,920

Build a timber frame extension - £25,280

Build a swimming pool - £80,280

Single storey extension - £40,600

Side return extension - £33,400

Install an RSJ - £1,480

Outbuilding - £9,280

Build a Mansard loft conversion - £51,280

Loft conversion - £27,000

Build a kitchen extension - £41,280

Hip to gable loft conversion - £41,280

Granny annexe - £86,280

Garden office - £9,280

Convert a Garage - £15,280

Garage - £17,780

Build a flat roof extension - £21,280

Build a dormer loft conversion - £41,280

Concrete foundations - £5,530

Convert a bungalow loft - £28,280

Convert a basement - £29,400