From £2,008
Relax... you have found a reliable extension builder in Runcorn. Webby is a friendly and reliable company based in Runcorn who consider no job as t...
From £1,808
Runcorn, WA7
Relax... you have found a reliable extension builder in Runcorn. R A C Gas is a friendly and reliable company based in Runcorn who consider no job ...
From £1,984
Need to find an Extension Builder near you for all your extension buildering work?
DT ANDERSON CONSTRUCTION LTD provides a local, trusted e...
From £2,024
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,192
J.T.Construction is a trusted extension builder serving customers in Runcorn and the surrounding area. Contact us to today to get a competitive quo...
From £1,872
Fixit Cheshire is an established and experienced local extension builder in Runcorn. Please contact us for a free, no obligation quote and competit...
From £1,984
Building from the Ground up through to fit out, new build, refurb, extension.
From £2,104
Relax... you have found a reliable extension builder in Runcorn. PENNY LANE BUILDERS LTD is a friendly and reliable company based in Runcorn who co...
From £1,976
RP Construction Design is an established extension buildering business in Runcorn. We come highly recommended and provide competitive quotes for yo...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Runcorn it ranges from £1,808 (R A C Gas based in WA7) to £2,264 (Bakers Building Maintenance based in WA8).
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 Runcorn by posting a job with HaMuch and we will send it to extension builders in Runcorn.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Runcorn | £33 | £228 |
| Install An RSJ near Halton | £31 | £220 |
| Install An RSJ near Widnes | £31 | £220 |
| Install An RSJ near Warrington | £31 | £222 |
| Install An RSJ near Huyton with Roby | £31 | £225 |
| Install An RSJ near Prescot | £31 | £222 |
| Install An RSJ near Knowsley | £31 | £221 |
| Install An RSJ near St Helens | £31 | £224 |
| Install An RSJ near Ellesmere Port | £31 | £214 |
| Install An RSJ near Newton-le-Willows | £31 | £221 |
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 - £17,322

Two storey extension - £87,732

Build a timber frame extension - £25,822

Build a swimming pool - £80,822

Single storey extension - £51,432

Side return extension - £39,493

Install an RSJ - £2,022

Outbuilding - £9,822

Build a Mansard loft conversion - £51,822

Loft conversion - £32,078

Build a kitchen extension - £41,822

Hip to gable loft conversion - £41,822

Granny annexe - £86,822

Garden office - £9,822

Convert a Garage - £15,822

Garage - £18,322

Build a flat roof extension - £21,822

Build a dormer loft conversion - £41,822

Concrete foundations - £6,072

Convert a bungalow loft - £28,822

Convert a basement - £35,493