From £2,264
We pride ourselves in offering transparent, collaborative construction services, defining your project, through planning and taking your project t...
From £2,184
Abalon is Western Canada’s leading foundation repair and basement waterproofing company, operating in the Edmonton area for over 40 years (50 yea...
From £2,224
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
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 £2,600
Redbourn, AL3
Bob's Home Maintenance are here to help customers who need an Extension Builder in Redbourn. We offer a competitive rate to complete all your exten...
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 £2,544
Trusted and professional extension builder in Redbourn. Experienced in all extension buildering work and keeping within budget and on quote. Peter'...
From £2,312
4siblings are here to help customers who need an Extension Builder in Redbourn. We offer a competitive rate to complete all your extension builderi...
From £2,520
Relax... you have found a reliable extension builder in Redbourn. Designer Shade Solutions is a friendly and reliable company based in Redbourn who...
From £2,512
Trusted and professional extension builder in Redbourn. Experienced in all extension buildering work and keeping within budget and on quote. Home B...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Redbourn it ranges from £2,184 (Abalon Construction based in ZZ99) 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 Redbourn by posting a job with HaMuch and we will send it to extension builders in Redbourn.
| 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 Hemel Hempstead | £42 | £270 |
| Install An RSJ near Dacorum | £42 | £269 |
| Install An RSJ near Hatfield | £64 | £283 |
| Install An RSJ near Luton | £41 | £278 |
| Install An RSJ near Welwyn Garden City | £42 | £268 |
| 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 - £17,748

Two storey extension - £88,372

Build a timber frame extension - £26,248

Build a swimming pool - £81,248

Single storey extension - £59,960

Side return extension - £44,290

Install an RSJ - £2,448

Outbuilding - £10,248

Build a Mansard loft conversion - £52,248

Loft conversion - £36,075

Build a kitchen extension - £42,248

Hip to gable loft conversion - £42,248

Granny annexe - £87,248

Garden office - £10,248

Convert a Garage - £16,248

Garage - £18,748

Build a flat roof extension - £22,248

Build a dormer loft conversion - £42,248

Concrete foundations - £6,498

Convert a bungalow loft - £29,248

Convert a basement - £40,290