From £2,472
Need to find an Extension Builder near you for all your extension buildering work?
Asanta Builder provides a local, trusted extension build...
From £2,440
I am a British Gas trained engineer with a vast knowledge of all gas, central heating, and plumbing systems. Now working independently, I provide i...
From £2,240
Trusted and professional extension builder in MK9. Experienced in all extension buildering work and keeping within budget and on quote. Langton Bui...
From £2,152
Relax... you have found a reliable extension builder in MK9. Dean Prichard Building Services is a friendly and reliable company based in MK9 who co...
From £2,424
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,480
Need an Extension Builder in MK9? JA Project Management Services has been helping local clients (20 mile radius) with their extension buildering jo...
From £2,592
Need an Extension Builder in MK9? STARGRADE CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering jobs f...
From £2,352
Our building services company Dallcompanies Limited was established in May 2023, but have been helping customers in Milton Keynes and the surroundi...
From £2,288
Need to find an Extension Builder near you for all your extension buildering work?
Go-Large Design & Build Ltd provides a local, trusted ex...
From £2,432
Relax... you have found a reliable extension builder in MK9. Alexander Bradshaw LTD is a friendly and reliable company based in MK9 who consider no...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in MK9 it ranges from £2,152 (Dean Prichard Building Services based in MK13) to £2,592 (STARGRADE CONSTRUCTION LTD based in MK8).
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 MK9 by posting a job with HaMuch and we will send it to extension builders in MK9.
"Internal supporting wall needs removing (3.5m wide) and RSJ installed above plinths within ceiling." - MK19, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Milton Keynes | £39 | £263 |
| Install An RSJ near Bletchley | £39 | £265 |
| Install An RSJ near Leighton Buzzard | £38 | £270 |
| Install An RSJ near Ampthill | £38 | £258 |
| Install An RSJ near Aylesbury Vale | £36 | £246 |
| Install An RSJ near Mid Bedfordshire | £42 | £276 |
| Install An RSJ near Kempston | £44 | £273 |
| Install An RSJ near Bedford | £45 | £278 |
| Install An RSJ near South Bedfordshire | £45 | £278 |
| Install An RSJ near Dunstable | £41 | £270 |
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 - £17,687

Two storey extension - £88,281

Build a timber frame extension - £26,187

Build a swimming pool - £81,187

Single storey extension - £58,744

Side return extension - £43,606

Install an RSJ - £2,387

Outbuilding - £10,187

Build a Mansard loft conversion - £52,187

Loft conversion - £35,505

Build a kitchen extension - £42,187

Hip to gable loft conversion - £42,187

Granny annexe - £87,187

Garden office - £10,187

Convert a Garage - £16,187

Garage - £18,687

Build a flat roof extension - £22,187

Build a dormer loft conversion - £42,187

Concrete foundations - £6,437

Convert a bungalow loft - £29,187

Convert a basement - £39,606