From £1,712
N W Doyle & Son is a trusted extension builder serving customers in Downpatrick and the surrounding area. Contact us to today to get a competitive ...
From £1,472
apex pharaoh ltd is a trusted extension builder serving customers in Downpatrick and the surrounding area. Contact us to today to get a competitive...
From £1,512
Colin Gilmore Building Contractor is an established extension buildering business in Downpatrick. We come highly recommended and provide competitiv...
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 £1,696
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,600
T.I Building is a trusted extension builder serving customers in Downpatrick and the surrounding area. Contact us to today to get a competitive quo...
From £1,584
Relax... you have found a reliable extension builder in Downpatrick. Finch Construction NI is a friendly and reliable company based in Downpatrick ...
From £1,376
Trusted and professional extension builder in Downpatrick. Experienced in all extension buildering work and keeping within budget and on quote. Ext...
From £1,568
Relax... you have found a reliable extension builder in Downpatrick. SM Plumbing & Heating is a friendly and reliable company based in Downpatrick ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Downpatrick it ranges from £1,336 (Mount Oriel Conversions & Extensions based in BT8) to £1,712 (N W Doyle & Son based in BT24).
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 Downpatrick by posting a job with HaMuch and we will send it to extension builders in Downpatrick.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Portaferry | £22 | £164 |
| Install An RSJ near Ballynahinch | £19 | £189 |
| Install An RSJ near Saintfield | £23 | £162 |
| Install An RSJ near Comber | £22 | £160 |
| Install An RSJ near Ballygowan | £24 | £183 |
| Install An RSJ near Carryduff | £23 | £158 |
| Install An RSJ near Hillsborough and Culcavy | £25 | £170 |
| Install An RSJ near Lisburn | £24 | £164 |
| Install An RSJ near Belfast | £23 | £161 |
| Install An RSJ near Holywood | £23 | £159 |
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 - £16,854

Two storey extension - £87,032

Build a timber frame extension - £25,354

Build a swimming pool - £80,354

Single storey extension - £42,088

Side return extension - £34,237

Install an RSJ - £1,554

Outbuilding - £9,354

Build a Mansard loft conversion - £51,354

Loft conversion - £27,698

Build a kitchen extension - £41,354

Hip to gable loft conversion - £41,354

Granny annexe - £86,354

Garden office - £9,354

Convert a Garage - £15,354

Garage - £17,854

Build a flat roof extension - £21,354

Build a dormer loft conversion - £41,354

Concrete foundations - £5,604

Convert a bungalow loft - £28,354

Convert a basement - £30,237