From £2,216
Trusted and professional extension builder in March. Experienced in all extension buildering work and keeping within budget and on quote. PAUL BARR...
From £2,072
Oakenshield Construction Ltd is an established and experienced local extension builder in March. Please contact us for a free, no obligation quote ...
From £2,280
Need an Extension Builder in March? AVALON CONSTRUCTION has been helping local clients (20 mile radius) with their extension buildering jobs for ma...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in March it ranges from £2,072 (Oakenshield Construction Ltd based in PE14) to £2,280 (AVALON CONSTRUCTION based in PE14).
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 March by posting a job with HaMuch and we will send it to extension builders in March.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Wisbech | £34 | £255 |
| Install An RSJ near Peterborough | £40 | £281 |
| Install An RSJ near Ely | £40 | £279 |
| Install An RSJ near Huntingdonshire | £36 | £290 |
| Install An RSJ near Huntingdon | £38 | £284 |
| Install An RSJ near Spalding | £32 | £238 |
| Install An RSJ near King's Lynn | £33 | £254 |
| Install An RSJ near Cambridge | £41 | £275 |
| Install An RSJ near Kings Lynn & West Norfolk | £31 | £238 |
| Install An RSJ near St Neots | £51 | £318 |
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 - £17,489

Two storey extension - £87,984

Build a timber frame extension - £25,989

Build a swimming pool - £80,989

Single storey extension - £54,787

Side return extension - £41,380

Install an RSJ - £2,189

Outbuilding - £9,989

Build a Mansard loft conversion - £51,989

Loft conversion - £33,650

Build a kitchen extension - £41,989

Hip to gable loft conversion - £41,989

Granny annexe - £86,989

Garden office - £9,989

Convert a Garage - £15,989

Garage - £18,489

Build a flat roof extension - £21,989

Build a dormer loft conversion - £41,989

Concrete foundations - £6,239

Convert a bungalow loft - £28,989

Convert a basement - £37,380