From £2,264
Slough, SL1
Experienced extension builder ready to quote for your work. Genius Home Improvements Ltd is the best extension builder in Slough. No obligation fre...
From £2,400
Slough, SL1
Need an Extension Builder in Slough? BK Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many year...
From £2,136
Slough, SL2
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,184
Relax... you have found a reliable extension builder in Slough. MVH Building Solutions Ltd is a friendly and reliable company based in Slough who c...
From £1,616
Slough, SL1
Free quotation 100% satisfaction cheap and reliable beat any price ...
From £2,448
Slough, SL1
Relax... you have found a reliable extension builder in Slough. Redwood Building Services Ltd is a friendly and reliable company based in Slough wh...
From £2,480
B S BUILDERS is an established and experienced local extension builder in Slough. Please contact us for a free, no obligation quote and competitive...
From £2,296
J & J Construction are here to help customers who need an Extension Builder in Slough. We offer a competitive rate to complete all your extension b...
From £2,568
Slough, SL1
Need an Extension Builder in Slough? N H Building Services has been helping local clients (20 mile radius) with their extension buildering jobs for...
From £2,248
Experienced extension builder ready to quote for your work. Sherry Construction is the best extension builder in Slough. No obligation free quotes ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Slough it ranges from £1,616 (Jeet & jarmal based in SL1) to £2,568 (N H Building Services based in SL1).
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 Slough by posting a job with HaMuch and we will send it to extension builders in Slough.
"RSJ installation" - SLOUGH, job posted 05/07/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Slough | £42 | £272 |
| Install An RSJ near Windsor & Maidenhead | £42 | £272 |
| Install An RSJ near Windsor | £41 | £271 |
| Install An RSJ near Maidenhead | £41 | £273 |
| Install An RSJ near Egham | £42 | £266 |
| Install An RSJ near Gerrards Cross | £43 | £282 |
| Install An RSJ near Staines-upon-Thames | £42 | £269 |
| Install An RSJ near Hillingdon | £62 | £276 |
| Install An RSJ near Ascot | £41 | £276 |
| Install An RSJ near Bracknell Forest | £41 | £287 |
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 - £17,564

Two storey extension - £88,096

Build a timber frame extension - £26,064

Build a swimming pool - £81,064

Single storey extension - £56,280

Side return extension - £42,220

Install an RSJ - £2,264

Outbuilding - £10,064

Build a Mansard loft conversion - £52,064

Loft conversion - £34,350

Build a kitchen extension - £42,064

Hip to gable loft conversion - £42,064

Granny annexe - £87,064

Garden office - £10,064

Convert a Garage - £16,064

Garage - £18,564

Build a flat roof extension - £22,064

Build a dormer loft conversion - £42,064

Concrete foundations - £6,314

Convert a bungalow loft - £29,064

Convert a basement - £38,220