From £2,176
Southsea, PO4
Experienced extension builder ready to quote for your work. Portsmouth Building Repairs is the best extension builder in Southsea. No obligation fr...
From £2,096
Abacus Building Services is an established and experienced local extension builder in Southsea. Please contact us for a free, no obligation quote a...
From £2,192
Southsea, PO5
BUILD PROJECT LIMITED are here to help customers who need an Extension Builder in Southsea. We offer a competitive rate to complete all your extens...
From £2,120
Southsea, PO5
Relax... you have found a reliable extension builder in Southsea. IndieGo Build is a friendly and reliable company based in Southsea who consider n...
From £2,376
Southsea, PO5
JKS Property is an established and experienced local extension builder in Southsea. Please contact us for a free, no obligation quote and competiti...
From £2,200
Experienced extension builder ready to quote for your work. Pompey Homes Ltd is the best extension builder in Southsea. No obligation free quotes a...
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 Southsea. No obligation free quo...
From £2,216
Need an Extension Builder in Southsea? Buildtech southern Ltd has been helping local clients (20 mile radius) with their extension buildering jobs ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Southsea 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 Southsea by posting a job with HaMuch and we will send it to extension builders in Southsea.
"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