Peter Rourke
Trusted and professional extension builder in AL3. Experienced in all extension buildering work and keeping within budget and on quote. Peter's Gut...
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...
Edmond Begu
EB Construction & Building Ltd are here to help customers who need an Extension Builder in AL3. We offer a competitive rate to complete all your ex...
Simon Johnson
Simon Johnson & Sons Builders are here to help customers who need an Extension Builder in AL3. We offer a competitive rate to complete all your ext...
Need an Extension Builder in AL3? JCG BUILDING SERVICES LTD has been helping local clients (20 mile radius) with their extension buildering jobs fo...
From £2,240
Trevor
Trusted and professional extension builder in AL3. Experienced in all extension buildering work and keeping within budget and on quote. T Woodman L...
From £2,280
WHITE HART BUILDING LIMITED is a trusted extension builder serving customers in AL3 and the surrounding area. Contact us to today to get a competit...
From £2,344
Relax... you have found a reliable extension builder in AL3. DK Home Refurbishment Limited is a friendly and reliable company based in AL3 who cons...
From £2,312
Need to find an Extension Builder near you for all your extension buildering work?
AUBREY BUILDING SERVICES LTD provides a local, trusted e...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in AL3 it ranges from £2,096 (Simon Johnson & Sons Builders based in HP2) 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 AL3 by posting a job with HaMuch and we will send it to extension builders in AL3.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near St Albans | £63 | £289 |
| Install An RSJ near Harpenden | £87 | £317 |
| Install An RSJ near Hemel Hempstead | £42 | £270 |
| Install An RSJ near Dacorum | £42 | £269 |
| Install An RSJ near Hatfield | £65 | £285 |
| Install An RSJ near Luton | £42 | £279 |
| Install An RSJ near Welwyn Garden City | £42 | £269 |
| Install An RSJ near Berkhamsted | £41 | £263 |
| Install An RSJ near Bushey | £42 | £276 |
| Install An RSJ near Watford | £43 | £278 |
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 - £17,680

Two storey extension - £88,270

Build a timber frame extension - £26,180

Build a swimming pool - £81,180

Single storey extension - £58,600

Side return extension - £43,525

Install an RSJ - £2,380

Outbuilding - £10,180

Build a Mansard loft conversion - £52,180

Loft conversion - £35,438

Build a kitchen extension - £42,180

Hip to gable loft conversion - £42,180

Granny annexe - £87,180

Garden office - £10,180

Convert a Garage - £16,180

Garage - £18,680

Build a flat roof extension - £22,180

Build a dormer loft conversion - £42,180

Concrete foundations - £6,430

Convert a bungalow loft - £29,180

Convert a basement - £39,525