From £2,208
Whites Carpentry & Building prides in delivering an excellent extension buildering service and value for money in PO12 and the surrounding areas. ...
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 PO12 and the surrounding area. Contact us to today to get a competit...
From £2,328
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,256
K A Griffin General Builder is an established extension buildering business in PO12. We come highly recommended and provide competitive quotes for ...
From £2,424
Paul Stevens is a trusted extension builder serving customers in PO12 and the surrounding area. Contact us to today to get a competitive quote for ...
From £1,976
Been in the building trade for over 30years .have in that time worked all over the country on many different projects.
Have city &...
From £1,968
TP Developments are here to help customers who need an Extension Builder in PO12. We offer a competitive rate to complete all your extension builde...
From £2,344
Bailey Construction Services are here to help customers who need an Extension Builder in PO12. We offer a competitive rate to complete all your ext...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in PO12 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 PO12 by posting a job with HaMuch and we will send it to extension builders in PO12.
"RSJ installation" - PO2, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Gosport | £35 | £246 |
| Install An RSJ near Lee-on-the-Solent | £35 | £249 |
| Install An RSJ near Portsmouth | £36 | £250 |
| Install An RSJ near Fareham | £35 | £250 |
| Install An RSJ near Ryde | £34 | £255 |
| Install An RSJ near Havant & Waterloo | £35 | £248 |
| Install An RSJ near Waterlooville | £36 | £250 |
| Install An RSJ near Havant | £35 | £249 |
| Install An RSJ near Locks Heath | £33 | £240 |
| Install An RSJ near Horndean | £35 | £253 |
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 - £17,610

Two storey extension - £88,164

Build a timber frame extension - £26,110

Build a swimming pool - £81,110

Single storey extension - £57,192

Side return extension - £42,733

Install an RSJ - £2,310

Outbuilding - £10,110

Build a Mansard loft conversion - £52,110

Loft conversion - £34,778

Build a kitchen extension - £42,110

Hip to gable loft conversion - £42,110

Granny annexe - £87,110

Garden office - £10,110

Convert a Garage - £16,110

Garage - £18,610

Build a flat roof extension - £22,110

Build a dormer loft conversion - £42,110

Concrete foundations - £6,360

Convert a bungalow loft - £29,110

Convert a basement - £38,733