From £2,656
A.J Builders is an established and experienced local extension builder in LU4. Please contact us for a free, no obligation quote and competitive ra...
From £2,416
MARSH CONSTRUCTION (LUTON) LIM is an established extension buildering business in LU4. We come highly recommended and provide competitive quotes fo...
From £2,472
Top Notch Tradesmen is an established and experienced local extension builder in LU4. Please contact us for a free, no obligation quote and competi...
From £2,200
S Sherazi Home Improvement Service are here to help customers who need an Extension Builder in LU4. We offer a competitive rate to complete all you...
From £2,048
Di Carlo Construction LTD is a trusted extension builder serving customers in LU4 and the surrounding area. Contact us to today to get a competitiv...
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 £2,040
Smart Building Solutions are here to help customers who need an Extension Builder in LU4. We offer a competitive rate to complete all your extensio...
From £1,360
NJG glass & locks has over 25 years experience in the window and glazing industry. So don't hesitate to get a free quote
From £2,296
We use only the highest quality products, and you can rest assured knowing that we are fully certified and registered with the relevant authorities...
From £2,520
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in LU4 it ranges from £1,360 (NJG Glass & Locks based in LU5) to £2,656 (A.J Builders based in LU4).
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 LU4 by posting a job with HaMuch and we will send it to extension builders in LU4.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Luton | £42 | £276 |
| Install An RSJ near Dunstable | £41 | £270 |
| Install An RSJ near Mid Bedfordshire | £42 | £276 |
| Install An RSJ near Harpenden | £86 | £315 |
| Install An RSJ near Leighton Buzzard | £38 | £270 |
| Install An RSJ near Ampthill | £38 | £258 |
| Install An RSJ near Hitchin | £43 | £283 |
| Install An RSJ near Hemel Hempstead | £42 | £270 |
| Install An RSJ near Berkhamsted | £41 | £263 |
| Install An RSJ near Dacorum | £42 | £269 |
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 - £17,555

Two storey extension - £88,083

Build a timber frame extension - £26,055

Build a swimming pool - £81,055

Single storey extension - £56,104

Side return extension - £42,121

Install an RSJ - £2,255

Outbuilding - £10,055

Build a Mansard loft conversion - £52,055

Loft conversion - £34,268

Build a kitchen extension - £42,055

Hip to gable loft conversion - £42,055

Granny annexe - £87,055

Garden office - £10,055

Convert a Garage - £16,055

Garage - £18,555

Build a flat roof extension - £22,055

Build a dormer loft conversion - £42,055

Concrete foundations - £6,305

Convert a bungalow loft - £29,055

Convert a basement - £38,121