From £3,296
We are a Small Family run business with over 30 years experience in the building trade, Carpentry is my main trade, with NVQ Level 2.
From £2,344
We are a small family run business with over 20 years experience in brickwork, bathroom/kitchen fitting, roofing, landscaping, fencing, tiling and ...
From £1,952
Park Building Services Ltd is a trusted extension builder serving customers in PO30 and the surrounding area. Contact us to today to get a competit...
From £2,344
Bailey Construction Services are here to help customers who need an Extension Builder in PO30. We offer a competitive rate to complete all your ext...
From £1,952
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,320
Need to find an Extension Builder near you for all your extension buildering work?
Mobile Services provides a local, trusted extension buil...
From £2,392
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...
From £2,160
ROB DINE CONSTRUCTION is an established and experienced local extension builder in PO30. Please contact us for a free, no obligation quote and comp...
From £2,336
Claytons Building and Roofing are here to help customers who need an Extension Builder in PO30. We offer a competitive rate to complete all your ex...
From £2,392
Trusted and professional extension builder in PO30. Experienced in all extension buildering work and keeping within budget and on quote. A W PAVING...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in PO30 it ranges from £1,952 (Park Building Services Ltd based in PO9) to £3,296 (R&B Property Improvements based in PO9).
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 PO30 by posting a job with HaMuch and we will send it to extension builders in PO30.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Isle of Wight | £34 | £246 |
| Install An RSJ near Ryde | £34 | £255 |
| Install An RSJ near Lee-on-the-Solent | £35 | £249 |
| Install An RSJ near Gosport | £35 | £246 |
| Install An RSJ near Locks Heath | £33 | £240 |
| Install An RSJ near Fareham | £35 | £250 |
| Install An RSJ near Portsmouth | £36 | £250 |
| Install An RSJ near Southampton | £34 | £243 |
| Install An RSJ near Hedge End | £34 | £244 |
| Install An RSJ near Totton | £34 | £243 |
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 - £17,649

Two storey extension - £88,223

Build a timber frame extension - £26,149

Build a swimming pool - £81,149

Single storey extension - £57,976

Side return extension - £43,174

Install an RSJ - £2,349

Outbuilding - £10,149

Build a Mansard loft conversion - £52,149

Loft conversion - £35,145

Build a kitchen extension - £42,149

Hip to gable loft conversion - £42,149

Granny annexe - £87,149

Garden office - £10,149

Convert a Garage - £16,149

Garage - £18,649

Build a flat roof extension - £22,149

Build a dormer loft conversion - £42,149

Concrete foundations - £6,399

Convert a bungalow loft - £29,149

Convert a basement - £39,174