From £2,136
Plumbing, painting exterior, interior, extensions, plastering, skiming, carpeting, Flooring, you can ask us ..
From £2,432
If you are looking for a MK4 extension builder and you need something replaced, fitted, or fixed, contact Space Above Limited today. We are competi...
From £3,224
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,656
we are very efficient in our work.and make sure our client is one 100% satisfied with our work.
From £2,656
A.J Builders is an established and experienced local extension builder in MK4. Please contact us for a free, no obligation quote and competitive ra...
From £2,472
Top Notch Tradesmen is an established and experienced local extension builder in MK4. Please contact us for a free, no obligation quote and competi...
From £2,216
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,544
Need to find an Extension Builder near you for all your extension buildering work?
Greg-Bud provides a local, trusted extension buildering ...
From £2,448
RS Plumbing and Heating is a trusted extension builder serving customers in MK4 and the surrounding area. Contact us to today to get a competitive ...
From £2,648
Relax... you have found a reliable extension builder in MK4. Bench Mark Construction is a friendly and reliable company based in MK4 who consider n...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in MK4 it ranges from £1,656 (Rite Builders based in LU1) to £3,224 (J K L Building Contractors Ltd based in MK42).
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 MK4 by posting a job with HaMuch and we will send it to extension builders in MK4.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Bletchley | £39 | £265 |
| Install An RSJ near Milton Keynes | £39 | £263 |
| Install An RSJ near Leighton Buzzard | £38 | £270 |
| Install An RSJ near Aylesbury Vale | £36 | £246 |
| Install An RSJ near Ampthill | £38 | £258 |
| Install An RSJ near Aylesbury | £42 | £270 |
| Install An RSJ near Mid Bedfordshire | £42 | £276 |
| Install An RSJ near Dunstable | £41 | £272 |
| Install An RSJ near Kempston | £44 | £273 |
| Install An RSJ near South Bedfordshire | £45 | £278 |
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 - £17,743

Two storey extension - £88,365

Build a timber frame extension - £26,243

Build a swimming pool - £81,243

Single storey extension - £59,864

Side return extension - £44,236

Install an RSJ - £2,443

Outbuilding - £10,243

Build a Mansard loft conversion - £52,243

Loft conversion - £36,030

Build a kitchen extension - £42,243

Hip to gable loft conversion - £42,243

Granny annexe - £87,243

Garden office - £10,243

Convert a Garage - £16,243

Garage - £18,743

Build a flat roof extension - £22,243

Build a dormer loft conversion - £42,243

Concrete foundations - £6,493

Convert a bungalow loft - £29,243

Convert a basement - £40,236