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T.I Building is a trusted extension builder serving customers in Hillsborough and the surrounding area. Contact us to today to get a competitive qu...
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
Relax... you have found a reliable extension builder in Hillsborough. Finch Construction NI is a friendly and reliable company based in Hillsboroug...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Hillsborough it ranges from £1,336 (Mount Oriel Conversions & Extensions based in BT8) to £1,600 (T.I Building based in BT28).
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 Hillsborough by posting a job with HaMuch and we will send it to extension builders in Hillsborough.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Hillsborough and Culcavy | £25 | £170 |
| Install An RSJ near Lisburn | £24 | £164 |
| Install An RSJ near Maghaberry | £31 | £205 |
| Install An RSJ near Ballynahinch | £19 | £189 |
| Install An RSJ near Carryduff | £23 | £158 |
| Install An RSJ near Saintfield | £23 | £162 |
| Install An RSJ near Waringstown | £23 | £167 |
| Install An RSJ near Banbridge | £29 | £205 |
| Install An RSJ near Belfast | £23 | £161 |
| 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 - £16,807

Two storey extension - £86,960

Build a timber frame extension - £25,307

Build a swimming pool - £80,307

Single storey extension - £41,133

Side return extension - £33,700

Install an RSJ - £1,507

Outbuilding - £9,307

Build a Mansard loft conversion - £51,307

Loft conversion - £27,250

Build a kitchen extension - £41,307

Hip to gable loft conversion - £41,307

Granny annexe - £86,307

Garden office - £9,307

Convert a Garage - £15,307

Garage - £17,807

Build a flat roof extension - £21,307

Build a dormer loft conversion - £41,307

Concrete foundations - £5,557

Convert a bungalow loft - £28,307

Convert a basement - £29,700