From £2,176
Experienced extension builder ready to quote for your work. Portsmouth Building Repairs is the best extension builder in PO4. No obligation free qu...
From £2,096
Abacus Building Services is an established and experienced local extension builder in PO4. Please contact us for a free, no obligation quote and co...
From £2,192
BUILD PROJECT LIMITED are here to help customers who need an Extension Builder in PO4. We offer a competitive rate to complete all your extension b...
From £2,120
Relax... you have found a reliable extension builder in PO4. IndieGo Build is a friendly and reliable company based in PO4 who consider no job as t...
From £2,376
JKS Property is an established and experienced local extension builder in PO4. Please contact us for a free, no obligation quote and competitive ra...
From £2,200
Experienced extension builder ready to quote for your work. Pompey Homes Ltd is the best extension builder in PO4. No obligation free quotes and ma...
From £2,208
ARCHIBUILD design, build and deliver exciting design driven projects for clients who share our passion for spaces and places that benefit people.We...
From £2,040
Building services with over 10 years experience all work completed to the highest standard call for a quote.
From £2,168
Experienced extension builder ready to quote for your work. Shepperd Developments is the best extension builder in PO4. No obligation free quotes a...
From £2,216
Need an Extension Builder in PO4? Buildtech southern Ltd has been helping local clients (20 mile radius) with their extension buildering jobs for m...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in PO4 it ranges from £2,040 (Jack Leng Building Services based in PO1) to £2,376 (JKS Property based in PO5).
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 PO4 by posting a job with HaMuch and we will send it to extension builders in PO4.
"RSJ installation" - PO2, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Portsmouth | £36 | £250 |
| Install An RSJ near Gosport | £35 | £246 |
| Install An RSJ near Havant & Waterloo | £35 | £248 |
| Install An RSJ near Havant | £35 | £249 |
| Install An RSJ near Lee-on-the-Solent | £35 | £249 |
| Install An RSJ near Fareham | £35 | £250 |
| Install An RSJ near Waterlooville | £36 | £250 |
| Install An RSJ near Horndean | £35 | £253 |
| Install An RSJ near Locks Heath | £33 | £240 |
| Install An RSJ near Isle of Wight | £34 | £246 |
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 - £17,479

Two storey extension - £87,969

Build a timber frame extension - £25,979

Build a swimming pool - £80,979

Single storey extension - £54,584

Side return extension - £41,266

Install an RSJ - £2,179

Outbuilding - £9,979

Build a Mansard loft conversion - £51,979

Loft conversion - £33,555

Build a kitchen extension - £41,979

Hip to gable loft conversion - £41,979

Granny annexe - £86,979

Garden office - £9,979

Convert a Garage - £15,979

Garage - £18,479

Build a flat roof extension - £21,979

Build a dormer loft conversion - £41,979

Concrete foundations - £6,229

Convert a bungalow loft - £28,979

Convert a basement - £37,266