From £232
Need an Extension Builder in Sefton? T&T Building Contractors has been helping local clients (20 mile radius) with their extension buildering jobs ...
From £1,872
KOR BUILDING SERVICES is an established and experienced local extension builder in Sefton. Please contact us for a free, no obligation quote and co...
From £1,776
BTC Bernstef Ltd is an established extension buildering business in Sefton. We come highly recommended and provide competitive quotes for your work...
From £1,912
PARKFIELD CONSTRUCTION LTD is an established extension buildering business in Sefton. We come highly recommended and provide competitive quotes for...
From £2,080
Need to find an Extension Builder near you for all your extension buildering work?
Sbetts Building provides a local, trusted extension buil...
From £2,112
Relax... you have found a reliable extension builder in Sefton. OLIA CONSTRUCTION LTD is a friendly and reliable company based in Sefton who consid...
From £1,672
Trusted and professional extension builder in Sefton. Experienced in all extension buildering work and keeping within budget and on quote. Jones La...
From £1,960
CJ Construction are here to help customers who need an Extension Builder in Sefton. We offer a competitive rate to complete all your extension buil...
From £1,968
Relax... you have found a reliable extension builder in Sefton. KM Building Services is a friendly and reliable company based in Sefton who conside...
From £2,104
Need an Extension Builder in Sefton? Bob the Builder has been helping local clients (20 mile radius) with their extension buildering jobs for many ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Sefton it ranges from £232 (T&T Building Contractors based in L23) to £2,112 (OLIA CONSTRUCTION LTD based in L37).
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 Sefton by posting a job with HaMuch and we will send it to extension builders in Sefton.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Sefton | £34 | £221 |
| Install An RSJ near Crosby | £34 | £223 |
| Install An RSJ near Formby | £23 | £162 |
| Install An RSJ near Bootle | £32 | £223 |
| Install An RSJ near Maghull | £33 | £219 |
| Install An RSJ near Wallasey | £33 | £224 |
| Install An RSJ near Kirkby | £31 | £222 |
| Install An RSJ near Liverpool | £31 | £222 |
| Install An RSJ near Ormskirk | £29 | £206 |
| Install An RSJ near Birkenhead | £31 | £219 |
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 - £17,069

Two storey extension - £87,353

Build a timber frame extension - £25,569

Build a swimming pool - £80,569

Single storey extension - £46,376

Side return extension - £36,649

Install an RSJ - £1,769

Outbuilding - £9,569

Build a Mansard loft conversion - £51,569

Loft conversion - £29,708

Build a kitchen extension - £41,569

Hip to gable loft conversion - £41,569

Granny annexe - £86,569

Garden office - £9,569

Convert a Garage - £15,569

Garage - £18,069

Build a flat roof extension - £21,569

Build a dormer loft conversion - £41,569

Concrete foundations - £5,819

Convert a bungalow loft - £28,569

Convert a basement - £32,649