Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Lee Townsend
Need to find an Extension Builder near you for all your extension buildering work?
Lp Townsend Brickwork provides a local, trusted extensio...
BeautifulRenovation are here to help customers who need an Extension Builder in Iver. We offer a competitive rate to complete all your extension bu...
MRE Maintenance Services is an established and experienced local extension builder in Iver. Please contact us for a free, no obligation quote and c...
BDR Home Improvement are here to help customers who need an Extension Builder in Iver. We offer a competitive rate to complete all your extension b...
Experienced extension builder ready to quote for your work. Sherry Construction is the best extension builder in Iver. No obligation free quotes an...
EIC Builders Ltd are here to help customers who need an Extension Builder in Iver. We offer a competitive rate to complete all your extension build...
Varda
Need an Extension Builder in Iver? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many year...
Trusted and professional extension builder in Iver. Experienced in all extension buildering work and keeping within budget and on quote. DC Build &...
Hardeep Samra
MJ Builders (London) Ltd are here to help customers who need an Extension Builder in Iver. We offer a competitive rate to complete all your extensi...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Iver it ranges from £1,880 (Lp Townsend Brickwork based in SL2) to £2,512 (T M Builder based in UB4).
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 Iver by posting a job with HaMuch and we will send it to extension builders in Iver.
"RSJ installation" - SLOUGH, job posted 05/07/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Hillingdon | £63 | £276 |
| Install An RSJ near Slough | £42 | £272 |
| Install An RSJ near Windsor & Maidenhead | £42 | £272 |
| Install An RSJ near Gerrards Cross | £43 | £282 |
| Install An RSJ near Windsor | £41 | £271 |
| Install An RSJ near Staines-upon-Thames | £42 | £269 |
| Install An RSJ near Egham | £42 | £266 |
| Install An RSJ near Hounslow | £43 | £281 |
| Install An RSJ near Rickmansworth | £42 | £278 |
| Install An RSJ near Harrow | £43 | £270 |
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 - £17,593

Two storey extension - £88,139

Build a timber frame extension - £26,093

Build a swimming pool - £81,093

Single storey extension - £56,856

Side return extension - £42,544

Install an RSJ - £2,293

Outbuilding - £10,093

Build a Mansard loft conversion - £52,093

Loft conversion - £34,620

Build a kitchen extension - £42,093

Hip to gable loft conversion - £42,093

Granny annexe - £87,093

Garden office - £10,093

Convert a Garage - £16,093

Garage - £18,593

Build a flat roof extension - £22,093

Build a dormer loft conversion - £42,093

Concrete foundations - £6,343

Convert a bungalow loft - £29,093

Convert a basement - £38,544