From £1,376
Trusted and professional extension builder in Malone. Experienced in all extension buildering work and keeping within budget and on quote. Extended...
From £1,568
Relax... you have found a reliable extension builder in Malone. SM Plumbing & Heating is a friendly and reliable company based in Malone who consid...
From £1,536
Trusted and professional extension builder in Malone. Experienced in all extension buildering work and keeping within budget and on quote. Belfast ...
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...
From £1,584
Designco Ltd is an established extension buildering business in Malone. We come highly recommended and provide competitive quotes for your work.
From £1,584
Relax... you have found a reliable extension builder in Malone. Finch Construction NI is a friendly and reliable company based in Malone who consid...
From £1,600
T.I Building is a trusted extension builder serving customers in Malone and the surrounding area. Contact us to today to get a competitive quote fo...
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 £1,496
Ballantine building solutions is an established extension buildering business in Malone. We come highly recommended and provide competitive quotes ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Malone it ranges from £1,336 (Mount Oriel Conversions & Extensions based in BT8) 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 Malone by posting a job with HaMuch and we will send it to extension builders in Malone.
"RSJ installation" - BELFAST, job posted 09/08/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Belfast | £23 | £161 |
| Install An RSJ near Carryduff | £23 | £158 |
| Install An RSJ near Lisburn | £24 | £164 |
| Install An RSJ near Holywood | £23 | £159 |
| Install An RSJ near Comber | £22 | £160 |
| Install An RSJ near Hillsborough and Culcavy | £25 | £170 |
| Install An RSJ near Saintfield | £23 | £162 |
| Install An RSJ near Greenisland | £23 | £153 |
| Install An RSJ near Ballygowan | £24 | £183 |
| Install An RSJ near Crumlin | £26 | £194 |
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 - £16,834

Two storey extension - £87,002

Build a timber frame extension - £25,334

Build a swimming pool - £80,334

Single storey extension - £41,688

Side return extension - £34,012

Install an RSJ - £1,534

Outbuilding - £9,334

Build a Mansard loft conversion - £51,334

Loft conversion - £27,510

Build a kitchen extension - £41,334

Hip to gable loft conversion - £41,334

Granny annexe - £86,334

Garden office - £9,334

Convert a Garage - £15,334

Garage - £17,834

Build a flat roof extension - £21,334

Build a dormer loft conversion - £41,334

Concrete foundations - £5,584

Convert a bungalow loft - £28,334

Convert a basement - £30,012