Elena nuta Radu
Plumbing, painting exterior, interior, extensions, plastering, skiming, carpeting, Flooring, you can ask us ..
Need to find an Extension Builder near you for all your extension buildering work?
Greg-Bud provides a local, trusted extension buildering ...
Top Notch Tradesmen is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and c...
A.J Builders is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and competit...
Amarjeet Gill
Architecture and Construction all in one place.
FREE DRAWINGS for all projects we build.
Buyerz Trading is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and compet...
Are you looking for resin driveways in North London? We are a leading builder of driveways and patios in North London. We have expertise in various...
IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...
A1 Home Care Building Maintenance are here to help customers who need an Extension Builder in Harpenden. We offer a competitive rate to complete al...
Need an Extension Builder in Harpenden? A.MILLS BUILDING SOLUTIONS LTD has been helping local clients (20 mile radius) with their extension builder...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Harpenden it ranges from £2,136 (Bacan's cleaning painting and decorating based in LU1) to £2,736 (R. Newman Construction based in AL4).
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 Harpenden by posting a job with HaMuch and we will send it to extension builders in Harpenden.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Harpenden | £87 | £317 |
| Install An RSJ near St Albans | £63 | £289 |
| Install An RSJ near Luton | £42 | £279 |
| Install An RSJ near Hatfield | £65 | £285 |
| Install An RSJ near Hemel Hempstead | £42 | £270 |
| Install An RSJ near Welwyn Garden City | £42 | £269 |
| Install An RSJ near Dacorum | £42 | £269 |
| Install An RSJ near Hitchin | £43 | £283 |
| Install An RSJ near Dunstable | £41 | £274 |
| Install An RSJ near Stevenage | £44 | £282 |
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 - £17,752

Two storey extension - £88,378

Build a timber frame extension - £26,252

Build a swimming pool - £81,252

Single storey extension - £60,040

Side return extension - £44,335

Install an RSJ - £2,452

Outbuilding - £10,252

Build a Mansard loft conversion - £52,252

Loft conversion - £36,113

Build a kitchen extension - £42,252

Hip to gable loft conversion - £42,252

Granny annexe - £87,252

Garden office - £10,252

Convert a Garage - £16,252

Garage - £18,752

Build a flat roof extension - £22,252

Build a dormer loft conversion - £42,252

Concrete foundations - £6,502

Convert a bungalow loft - £29,252

Convert a basement - £40,335