From £2,640
IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...
From £2,520
Relax... you have found a reliable extension builder in St Albans. Designer Shade Solutions is a friendly and reliable company based in St Albans w...
From £2,440
Beswick Building and Renovations LTD is a trusted extension builder serving customers in St Albans and the surrounding area. Contact us to today to...
From £2,440
JAS Housing Developments is an established and experienced local extension builder in St Albans. Please contact us for a free, no obligation quote ...
From £2,480
Need to find an Extension Builder near you for all your extension buildering work?
JGS Building Ltd provides a local, trusted extension bui...
From £2,680
Building services company Renospace was established in 2000. Since then we have been helping customers in Hertfordshire and the surrounding area by...
From £2,280
Trusted and professional extension builder in St Albans. Experienced in all extension buildering work and keeping within budget and on quote. P & A...
From £2,344
Relax... you have found a reliable extension builder in St Albans. DK Home Refurbishment Limited is a friendly and reliable company based in St Alb...
From £2,336
Relax... you have found a reliable extension builder in St Albans. Property Interior Services is a friendly and reliable company based in St Albans...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in St Albans it ranges from £2,224 (Planson’s Building Services based in AL1) to £2,680 (RenoSpace based in AL3).
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 St Albans by posting a job with HaMuch and we will send it to extension builders in St Albans.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near St Albans | £63 | £288 |
| Install An RSJ near Harpenden | £86 | £315 |
| Install An RSJ near Hatfield | £64 | £283 |
| Install An RSJ near Hemel Hempstead | £42 | £270 |
| Install An RSJ near Dacorum | £42 | £269 |
| Install An RSJ near Borehamwood | £42 | £270 |
| Install An RSJ near Welwyn Garden City | £42 | £268 |
| Install An RSJ near Bushey | £42 | £276 |
| Install An RSJ near Watford | £43 | £278 |
| Install An RSJ near Potters Bar | £43 | £273 |
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 - £17,738

Two storey extension - £88,358

Build a timber frame extension - £26,238

Build a swimming pool - £81,238

Single storey extension - £59,768

Side return extension - £44,182

Install an RSJ - £2,438

Outbuilding - £10,238

Build a Mansard loft conversion - £52,238

Loft conversion - £35,985

Build a kitchen extension - £42,238

Hip to gable loft conversion - £42,238

Granny annexe - £87,238

Garden office - £10,238

Convert a Garage - £16,238

Garage - £18,738

Build a flat roof extension - £22,238

Build a dormer loft conversion - £42,238

Concrete foundations - £6,488

Convert a bungalow loft - £29,238

Convert a basement - £40,182