From £1,936
Relax... you have found a reliable extension builder in L18. R Sargeant is a friendly and reliable company based in L18 who consider no job as too ...
From £2,176
Nathan Thomas Plumbing is an established extension buildering business in L18. We come highly recommended and provide competitive quotes for your w...
From £2,016
DK Building is an established extension buildering business in L18. We come highly recommended and provide competitive quotes for your work.
From £2,288
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,072
Experienced extension builder ready to quote for your work. Elevate Finishing is the best extension builder in L18. No obligation free quotes and m...
From £2,000
Experienced extension builder ready to quote for your work. Oxygen Property Partners is the best extension builder in L18. No obligation free quot...
From £2,216
Art Henry's are here to help customers who need an Extension Builder in L18. We offer a competitive rate to complete all your extension buildering ...
From £2,504
Experienced extension builder ready to quote for your work. Spectrum is the best extension builder in L18. No obligation free quotes and many happy...
From £1,304
Liverpool Direct Builders is a trusted extension builder serving customers in L18 and the surrounding area. Contact us to today to get a competitiv...
From £1,952
Need an Extension Builder in L18? ARGYLE BUILDING AND MAINTENANCE has been helping local clients (20 mile radius) with their extension buildering j...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in L18 it ranges from £1,304 (Liverpool Direct Builders based in L14) to £2,504 (Spectrum based in L14).
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 L18 by posting a job with HaMuch and we will send it to extension builders in L18.
"RSJ installation" - LIVERPOOL, job posted 04/09/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Liverpool | £31 | £222 |
| Install An RSJ near Huyton with Roby | £31 | £225 |
| Install An RSJ near Knowsley | £31 | £222 |
| Install An RSJ near Bebington | £31 | £222 |
| Install An RSJ near Birkenhead | £31 | £219 |
| Install An RSJ near Prescot | £31 | £223 |
| Install An RSJ near Wallasey | £32 | £224 |
| Install An RSJ near Bootle | £32 | £223 |
| Install An RSJ near Kirkby | £31 | £223 |
| Install An RSJ near Widnes | £31 | £220 |
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 - £17,346

Two storey extension - £87,770

Build a timber frame extension - £25,846

Build a swimming pool - £80,846

Single storey extension - £51,928

Side return extension - £39,772

Install an RSJ - £2,046

Outbuilding - £9,846

Build a Mansard loft conversion - £51,846

Loft conversion - £32,310

Build a kitchen extension - £41,846

Hip to gable loft conversion - £41,846

Granny annexe - £86,846

Garden office - £9,846

Convert a Garage - £15,846

Garage - £18,346

Build a flat roof extension - £21,846

Build a dormer loft conversion - £41,846

Concrete foundations - £6,096

Convert a bungalow loft - £28,846

Convert a basement - £35,772