From £2,136
Plumbing, painting exterior, interior, extensions, plastering, skiming, carpeting, Flooring, you can ask us ..
From £3,784
Propello is an established and experienced local extension builder in SG3. Please contact us for a free, no obligation quote and competitive rates...
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 SG3. 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 SG3. 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 £2,632
Platinum Electrics is a Branch off Platinum Premier Projects who deal in all types of construction projects. Platinum Electrics are based in London...
From £2,312
JJSR Construction Ltd is an established and experienced local extension builder in SG3. Please contact us for a free, no obligation quote and compe...
From £2,120
NISUP BUILDING SERVICES Company specializes in the domestic and commercial building industry :1. Refurbishm...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SG3 it ranges from £1,656 (Rite Builders based in LU1) to £3,784 (Propello based in E17).
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 SG3 by posting a job with HaMuch and we will send it to extension builders in SG3.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Stevenage | £44 | £282 |
| Install An RSJ near Welwyn Garden City | £42 | £268 |
| Install An RSJ near Hertford | £46 | £289 |
| Install An RSJ near Hitchin | £43 | £283 |
| Install An RSJ near East Hertfordshire | £44 | £289 |
| Install An RSJ near North Hertfordshire | £44 | £283 |
| Install An RSJ near Hatfield | £64 | £283 |
| Install An RSJ near Ware | £47 | £296 |
| Install An RSJ near Harpenden | £86 | £315 |
| Install An RSJ near Letchworth | £44 | £283 |
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 - £17,753

Two storey extension - £88,379

Build a timber frame extension - £26,253

Build a swimming pool - £81,253

Single storey extension - £60,056

Side return extension - £44,344

Install an RSJ - £2,453

Outbuilding - £10,253

Build a Mansard loft conversion - £52,253

Loft conversion - £36,120

Build a kitchen extension - £42,253

Hip to gable loft conversion - £42,253

Granny annexe - £87,253

Garden office - £10,253

Convert a Garage - £16,253

Garage - £18,753

Build a flat roof extension - £22,253

Build a dormer loft conversion - £42,253

Concrete foundations - £6,503

Convert a bungalow loft - £29,253

Convert a basement - £40,344