EGPM LTD are here to help customers who need an Extension Builder in SL5. We offer a competitive rate to complete all your extension buildering job...
Experienced extension builder ready to quote for your work. A L King Services is the best extension builder in SL5. No obligation free quotes and m...
Kendall Construction is an established and experienced local extension builder in SL5. Please contact us for a free, no obligation quote and compet...
ASAP Roofing & Exterior Maintenance is a trusted extension builder serving customers in SL5 and the surrounding area. Contact us to today to get a ...
Andrew Davies
We have been in the trade for some years now and offer a wide range of services from decorating through to complete refurbishment .
From £2,488
BRICK CONSTRUCTION is a trusted extension builder serving customers in SL5 and the surrounding area. Contact us to today to get a competitive quote...
From £2,136
BESPOKE BUILDING SOLUTIONS is an established and experienced local extension builder in SL5. Please contact us for a free, no obligation quote and ...
From £2,168
JORDAN CONSTRUCTION LTD are here to help customers who need an Extension Builder in SL5. We offer a competitive rate to complete all your extension...
From £2,192
Stoke Park Developments Ltd is a trusted extension builder serving customers in SL5 and the surrounding area. Contact us to today to get a competit...
From £2,488
Trusted and professional extension builder in SL5. Experienced in all extension buildering work and keeping within budget and on quote. Crown Desig...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SL5 it ranges from £2,136 (D and D Property Maintenance based in RG12) to £2,672 (Kendall Construction based in GU19).
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 SL5 by posting a job with HaMuch and we will send it to extension builders in SL5.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Ascot | £41 | £276 |
| Install An RSJ near Bracknell | £41 | £285 |
| Install An RSJ near Bracknell Forest | £41 | £287 |
| Install An RSJ near Egham | £42 | £266 |
| Install An RSJ near Windsor | £41 | £271 |
| Install An RSJ near Windsor & Maidenhead | £42 | £272 |
| Install An RSJ near Camberley | £41 | £282 |
| Install An RSJ near Staines-upon-Thames | £42 | £269 |
| Install An RSJ near Sandhurst | £41 | £283 |
| Install An RSJ near Wokingham | £41 | £279 |
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 - £17,665

Two storey extension - £88,247

Build a timber frame extension - £26,165

Build a swimming pool - £81,165

Single storey extension - £58,296

Side return extension - £43,354

Install an RSJ - £2,365

Outbuilding - £10,165

Build a Mansard loft conversion - £52,165

Loft conversion - £35,295

Build a kitchen extension - £42,165

Hip to gable loft conversion - £42,165

Granny annexe - £87,165

Garden office - £10,165

Convert a Garage - £16,165

Garage - £18,665

Build a flat roof extension - £22,165

Build a dormer loft conversion - £42,165

Concrete foundations - £6,415

Convert a bungalow loft - £29,165

Convert a basement - £39,354