From £2,192
ARC Building Services is a trusted extension builder serving customers in LU1 and the surrounding area. Contact us to today to get a competitive q...
From £2,136
Plumbing, painting exterior, interior, extensions, plastering, skiming, carpeting, Flooring, you can ask us ..
From £1,656
we are very efficient in our work.and make sure our client is one 100% satisfied with our work.
From £2,240
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,320
GA Plan and Design is an established and experienced local extension builder in LU1. Please contact us for a free, no obligation quote and competit...
From £2,608
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,424
Inkerman Building & Roofing Co are here to help customers who need an Extension Builder in LU1. We offer a competitive rate to complete all your ex...
From £2,200
S Sherazi Home Improvement Service are here to help customers who need an Extension Builder in LU1. We offer a competitive rate to complete all you...
From £2,592
ACR Build is an established and experienced local extension builder in LU1. Please contact us for a free, no obligation quote and competitive rates...
From £5,152
Painting & Decorating including property maintenance Building services honest trustworthy fully qualified decorators established 35 years.We cove...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in LU1 it ranges from £1,656 (Rite Builders based in LU1) to £5,152 ( A & D Maintenance Services Ltd based in LU2).
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 LU1 by posting a job with HaMuch and we will send it to extension builders in LU1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Luton | £37 | £240 |
| Install An RSJ near Dunstable | £36 | £235 |
| Install An RSJ near Harpenden | £70 | £264 |
| Install An RSJ near Hitchin | £37 | £238 |
| Install An RSJ near Hemel Hempstead | £36 | £232 |
| Install An RSJ near Mid Bedfordshire | £34 | £225 |
| Install An RSJ near St Albans | £52 | £246 |
| Install An RSJ near Dacorum | £36 | £232 |
| Install An RSJ near Berkhamsted | £35 | £227 |
| Install An RSJ near Stevenage | £37 | £239 |
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 - £17,852

Two storey extension - £88,528

Build a timber frame extension - £26,352

Build a swimming pool - £81,352

Single storey extension - £62,040

Side return extension - £45,460

Install an RSJ - £2,552

Outbuilding - £10,352

Build a Mansard loft conversion - £52,352

Loft conversion - £37,050

Build a kitchen extension - £42,352

Hip to gable loft conversion - £42,352

Granny annexe - £87,352

Garden office - £10,352

Convert a Garage - £16,352

Garage - £18,852

Build a flat roof extension - £22,352

Build a dormer loft conversion - £42,352

Concrete foundations - £6,602

Convert a bungalow loft - £29,352

Convert a basement - £41,460