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T.I Building is a trusted extension builder serving customers in Lisburn and the surrounding area. Contact us to today to get a competitive quote f...
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
Relax... you have found a reliable extension builder in Lisburn. SM Plumbing & Heating is a friendly and reliable company based in Lisburn who cons...
From £1,536
Trusted and professional extension builder in Lisburn. 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 Lisburn. Finch Construction NI is a friendly and reliable company based in Lisburn who cons...
From £1,376
Trusted and professional extension builder in Lisburn. Experienced in all extension buildering work and keeping within budget and on quote. Extende...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Lisburn 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 Lisburn by posting a job with HaMuch and we will send it to extension builders in Lisburn.
"RSJ installation" - BT17, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Lisburn | £24 | £164 |
| Install An RSJ near Hillsborough and Culcavy | £25 | £170 |
| Install An RSJ near Maghaberry | £31 | £205 |
| Install An RSJ near Carryduff | £23 | £158 |
| Install An RSJ near Belfast | £23 | £161 |
| Install An RSJ near Crumlin | £26 | £194 |
| Install An RSJ near Saintfield | £23 | £162 |
| Install An RSJ near Ballynahinch | £19 | £189 |
| Install An RSJ near Waringstown | £23 | £167 |
| 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 - £16,827

Two storey extension - £86,990

Build a timber frame extension - £25,327

Build a swimming pool - £80,327

Single storey extension - £41,537

Side return extension - £33,927

Install an RSJ - £1,527

Outbuilding - £9,327

Build a Mansard loft conversion - £51,327

Loft conversion - £27,439

Build a kitchen extension - £41,327

Hip to gable loft conversion - £41,327

Granny annexe - £86,327

Garden office - £9,327

Convert a Garage - £15,327

Garage - £17,827

Build a flat roof extension - £21,327

Build a dormer loft conversion - £41,327

Concrete foundations - £5,577

Convert a bungalow loft - £28,327

Convert a basement - £29,927