Relax... you have found a reliable extension builder in Test Valley. Bob Shearer Property Maintenance, Building & Roofing is a friendly and reliabl...
From £2,240
Need an Extension Builder in Test Valley? BARTITIONS DESIGN & BUILD LTD has been helping local clients (20 mile radius) with their extension build...
From £2,320
Our building services company Shadow UK Construction Ltd was established in March 2022, but have been providing professional, trustworthy building ...
From £2,304
JJ Acquisitions ltd is a trusted extension builder serving customers in Test Valley and the surrounding area. Contact us to today to get a competit...
From £2,272
DMT Construction t/a are here to help customers who need an Extension Builder in Test Valley. We offer a competitive rate to complete all your exte...
From £1,952
4Walls Project Management Ltd is an established and experienced local extension builder in Test Valley. Please contact us for a free, no obligation...
From £2,096
Relax... you have found a reliable extension builder in Test Valley. Groundcraft Ltd is a friendly and reliable company based in Test Valley who co...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Test Valley it ranges from £1,952 (4Walls Project Management Ltd based in SP10) to £2,320 (Shadow UK Construction Ltd based in SO20).
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 Test Valley by posting a job with HaMuch and we will send it to extension builders in Test Valley.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Test Valley | £37 | £261 |
| Install An RSJ near Andover | £40 | £248 |
| Install An RSJ near Romsey | £32 | £230 |
| Install An RSJ near Salisbury | £35 | £247 |
| Install An RSJ near Winchester | £39 | £283 |
| Install An RSJ near Chandler's Ford | £34 | £245 |
| Install An RSJ near Eastleigh | £34 | £244 |
| Install An RSJ near Totton | £34 | £243 |
| Install An RSJ near Southampton | £34 | £243 |
| 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 - £17,495

Two storey extension - £87,993

Build a timber frame extension - £25,995

Build a swimming pool - £80,995

Single storey extension - £54,909

Side return extension - £41,449

Install an RSJ - £2,195

Outbuilding - £9,995

Build a Mansard loft conversion - £51,995

Loft conversion - £33,707

Build a kitchen extension - £41,995

Hip to gable loft conversion - £41,995

Granny annexe - £86,995

Garden office - £9,995

Convert a Garage - £15,995

Garage - £18,495

Build a flat roof extension - £21,995

Build a dormer loft conversion - £41,995

Concrete foundations - £6,245

Convert a bungalow loft - £28,995

Convert a basement - £37,449