From £1,880
Trusted and professional extension builder in SN25. Experienced in all extension buildering work and keeping within budget and on quote. G R & Son ...
From £1,656
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,960
Dacol Services is Swindons number 1 property maintenance service.
Trusted by many letting agents, landlords, homeowners, and hoteliers.
From £2,296
MJ solutions is an established and experienced local extension builder in SN25. Please contact us for a free, no obligation quote and competitive ...
From £2,064
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,024
R & R BUILDERS is an established and experienced local extension builder in SN25. Please contact us for a free, no obligation quote and competitive...
From £2,440
Experienced extension builder ready to quote for your work. Biocraft South West Ltd is the best extension builder in SN25. No obligation free quote...
From £1,928
SWIFT DESIGN & BUILD LTD are here to help customers who need an Extension Builder in SN25. We offer a competitive rate to complete all your extensi...
From £2,120
Complete Driveway Solutions is an established and experienced local extension builder in SN25. Please contact us for a free, no obligation quote an...
From £2,072
Craig Donnelly Building Contractors Ltd is a trusted extension builder serving customers in SN25 and the surrounding area. Contact us to today to g...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SN25 it ranges from £1,656 (Watts Builders based in SN25) to £2,440 (Biocraft South West Ltd based in SN5).
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 SN25 by posting a job with HaMuch and we will send it to extension builders in SN25.
"RSJ installation" - SN2
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Thamesdown | £38 | £239 |
| Install An RSJ near Stratton St Margaret | £37 | £238 |
| Install An RSJ near Swindon | £38 | £238 |
| Install An RSJ near Calne | £29 | £225 |
| Install An RSJ near Vale of White Horse | £36 | £271 |
| Install An RSJ near West Wiltshire | £32 | £242 |
| Install An RSJ near North Wiltshire | £32 | £242 |
| Install An RSJ near Witney | £32 | £244 |
| Install An RSJ near Chippenham | £34 | £258 |
| Install An RSJ near Devizes | £32 | £242 |
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 - £17,344

Two storey extension - £87,766

Build a timber frame extension - £25,844

Build a swimming pool - £80,844

Single storey extension - £51,880

Side return extension - £39,745

Install an RSJ - £2,044

Outbuilding - £9,844

Build a Mansard loft conversion - £51,844

Loft conversion - £32,288

Build a kitchen extension - £41,844

Hip to gable loft conversion - £41,844

Granny annexe - £86,844

Garden office - £9,844

Convert a Garage - £15,844

Garage - £18,344

Build a flat roof extension - £21,844

Build a dormer loft conversion - £41,844

Concrete foundations - £6,094

Convert a bungalow loft - £28,844

Convert a basement - £35,745