Richie Crawley
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 ...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Fixit Cheshire is an established and experienced local extension builder in Runcorn. Please contact us for a free, no obligation quote and competit...
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...
Get an Extension Builder in Runcorn who you can trust. National Plumbing and Heating provide friendly and reliable extension buildering services to...
Experienced extension builder ready to quote for your work. Elevate Finishing is the best extension builder in Runcorn. No obligation free quotes a...
From £1,984
Carl Tommons
Building from the Ground up through to fit out, new build, refurb, extension.
From £1,848
Trusted and professional extension builder in Runcorn. Experienced in all extension buildering work and keeping within budget and on quote. HPH Imp...
From £1,896
Welcome to Space Design & Build a building company based in Warrington.With nearly 40 years combined experience in the industry Space Design & Buil...
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...

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 £2,192 (J.T.Construction based in WA5).
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 | £223 |
| Install An RSJ near Knowsley | £31 | £222 |
| 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 - £17,286

Two storey extension - £87,678

Build a timber frame extension - £25,786

Build a swimming pool - £80,786

Single storey extension - £50,712

Side return extension - £39,088

Install an RSJ - £1,986

Outbuilding - £9,786

Build a Mansard loft conversion - £51,786

Loft conversion - £31,740

Build a kitchen extension - £41,786

Hip to gable loft conversion - £41,786

Granny annexe - £86,786

Garden office - £9,786

Convert a Garage - £15,786

Garage - £18,286

Build a flat roof extension - £21,786

Build a dormer loft conversion - £41,786

Concrete foundations - £6,036

Convert a bungalow loft - £28,786

Convert a basement - £35,088