Karl Builder
Hi we are a building company that have been working in the swindon area for many years we also work as far as bristol We do loft conversion. ...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Claytons Building and Roofing are here to help customers who need an Extension Builder in Eastleigh. We offer a competitive rate to complete all yo...
ROB DINE CONSTRUCTION is an established and experienced local extension builder in Eastleigh. Please contact us for a free, no obligation quote and...
Arshad Ali
We are a Design and Build company based in Hampshire. Proud of our roots, we try to be the very best in the way we go about our business. Friendly...
Need to find an Extension Builder near you for all your extension buildering work?
Mobile Services provides a local, trusted extension buil...
Trusted and professional extension builder in Eastleigh. Experienced in all extension buildering work and keeping within budget and on quote. Andy'...
Luke Rees
Eastleigh, SO53
General Building Services (Southampton) Ltd is a trusted extension builder serving customers in Eastleigh and the surrounding area. Contact us to t...
Experienced extension builder ready to quote for your work. CSY Construction Ltd is the best extension builder in Eastleigh. No obligation free quo...
Bailey Construction Services are here to help customers who need an Extension Builder in Eastleigh. We offer a competitive rate to complete all you...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Eastleigh it ranges from £1,952 (Steve Lovett Builders based in SO18) to £3,000 (Boss based in SO23).
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 Eastleigh by posting a job with HaMuch and we will send it to extension builders in Eastleigh.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Eastleigh | £34 | £244 |
| Install An RSJ near Chandler's Ford | £34 | £245 |
| Install An RSJ near Southampton | £34 | £243 |
| Install An RSJ near Hedge End | £34 | £244 |
| Install An RSJ near Romsey | £32 | £230 |
| Install An RSJ near Totton | £34 | £243 |
| Install An RSJ near Winchester | £39 | £283 |
| Install An RSJ near Locks Heath | £33 | £240 |
| Install An RSJ near Fareham | £35 | £250 |
| Install An RSJ near New Forest | £32 | £245 |
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 - £17,612

Two storey extension - £88,168

Build a timber frame extension - £26,112

Build a swimming pool - £81,112

Single storey extension - £57,240

Side return extension - £42,760

Install an RSJ - £2,312

Outbuilding - £10,112

Build a Mansard loft conversion - £52,112

Loft conversion - £34,800

Build a kitchen extension - £42,112

Hip to gable loft conversion - £42,112

Granny annexe - £87,112

Garden office - £10,112

Convert a Garage - £16,112

Garage - £18,612

Build a flat roof extension - £22,112

Build a dormer loft conversion - £42,112

Concrete foundations - £6,362

Convert a bungalow loft - £29,112

Convert a basement - £38,760