From £2,624
Nouvell Decor is a trusted extension builder serving customers in AL2 and the surrounding area. Contact us to today to get a competitive quote for ...
From £2,184
JK Doors is a trusted extension builder serving customers in AL2 and the surrounding area. Contact us to today to get a competitive quote for exten...
From £2,512
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,592
Need an Extension Builder in AL2? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £2,248
Trusted and professional extension builder in AL2. Experienced in all extension buildering work and keeping within budget and on quote. WHITE EAGLE...
From £2,384
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in AL2. No obligation free quotes and m...
From £2,760
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...
From £2,296
Experienced extension builder ready to quote for your work. Mr is the best extension builder in AL2. No obligation free quotes and many happy custo...
From £2,392
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
From £2,152
Global Building & Designs Ltd is an established and experienced local extension builder in AL2. Please contact us for a free, no obligation quote a...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in AL2 it ranges from £2,152 (Global Building & Designs Ltd based in W7) to £2,760 (Rafix Building based in EN4).
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 AL2 by posting a job with HaMuch and we will send it to extension builders in AL2.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near St Albans | £63 | £288 |
| Install An RSJ near Borehamwood | £42 | £270 |
| Install An RSJ near Bushey | £42 | £276 |
| Install An RSJ near Hatfield | £64 | £283 |
| Install An RSJ near Watford | £43 | £278 |
| Install An RSJ near Harpenden | £86 | £315 |
| Install An RSJ near Potters Bar | £43 | £273 |
| Install An RSJ near Hemel Hempstead | £42 | £270 |
| Install An RSJ near Dacorum | £42 | £269 |
| Install An RSJ near High Barnet | £43 | £272 |
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 - £17,714

Two storey extension - £88,322

Build a timber frame extension - £26,214

Build a swimming pool - £81,214

Single storey extension - £59,288

Side return extension - £43,912

Install an RSJ - £2,414

Outbuilding - £10,214

Build a Mansard loft conversion - £52,214

Loft conversion - £35,760

Build a kitchen extension - £42,214

Hip to gable loft conversion - £42,214

Granny annexe - £87,214

Garden office - £10,214

Convert a Garage - £16,214

Garage - £18,714

Build a flat roof extension - £22,214

Build a dormer loft conversion - £42,214

Concrete foundations - £6,464

Convert a bungalow loft - £29,214

Convert a basement - £39,912