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In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
Southport, PR8
Looking for an Extension Builder near Southport for all your extension buildering jobs?
Evergreen Developments Nw Ltd...
Southport, PR8
Prestige Property Conversions Ltd is an established extension buildering business in Southport. We come highly recommended and provide competitive ...
From £1,504
John Scarisbrick
Local reliable family business
Free estimates
Clean friendly service
From £1,840
Need an Extension Builder in Southport? M D Joinery (Southport) Ltd has been helping local clients (20 mile radius) with their extension buildering...
From £2,112
Relax... you have found a reliable extension builder in Southport. OLIA CONSTRUCTION LTD is a friendly and reliable company based in Southport who ...
From £2,200
Urban Select Construction is a trusted extension builder serving customers in Southport and the surrounding area. Contact us to today to get a comp...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Southport it ranges from £1,472 (A.K.S based in L40) to £2,200 (Evergreen Developments Nw Ltd based in PR8).
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 Southport by posting a job with HaMuch and we will send it to extension builders in Southport.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Southport | £27 | £198 |
| Install An RSJ near Formby | £28 | £206 |
| Install An RSJ near Ormskirk | £29 | £206 |
| Install An RSJ near West Lancashire | £28 | £203 |
| Install An RSJ near Maghull | £34 | £231 |
| Install An RSJ near Sefton | £35 | £234 |
| Install An RSJ near Lytham St Annes | £28 | £206 |
| Install An RSJ near Crosby | £35 | £234 |
| Install An RSJ near Skelmersdale | £28 | £210 |
| Install An RSJ near Kirkby | £31 | £224 |
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 - £17,160

Two storey extension - £87,490

Build a timber frame extension - £25,660

Build a swimming pool - £80,660

Single storey extension - £48,200

Side return extension - £37,675

Install an RSJ - £1,860

Outbuilding - £9,660

Build a Mansard loft conversion - £51,660

Loft conversion - £30,563

Build a kitchen extension - £41,660

Hip to gable loft conversion - £41,660

Granny annexe - £86,660

Garden office - £9,660

Convert a Garage - £15,660

Garage - £18,160

Build a flat roof extension - £21,660

Build a dormer loft conversion - £41,660

Concrete foundations - £5,910

Convert a bungalow loft - £28,660

Convert a basement - £33,675