From £1,984
NICK SMITH BUILDERS is an established extension buildering business in PO15. We come highly recommended and provide competitive quotes for your wor...
From £2,240
Been in the trade for over 30 yrs and take pride in my work. Fully insured and references both trade and private available
From £2,384
Stubbington Roofing Ltd. is an established extension buildering business in PO15. We come highly recommended and provide competitive quotes for you...
From £2,200
We are experts in cavity wall insulation, cavity wall insulation removal, loft insulation, loft boarding, room in roof insulation, chemical damp pr...
From £2,176
O NEILL CONSTRUCTION LTD is an established extension buildering business in PO15. We come highly recommended and provide competitive quotes for you...
From £2,392
Trusted and professional extension builder in PO15. Experienced in all extension buildering work and keeping within budget and on quote. A W PAVING...
From £2,128
Relax... you have found a reliable extension builder in PO15. MA Builders is a friendly and reliable company based in PO15 who consider no job as t...
From £2,184
Trusted and professional extension builder in PO15. Experienced in all extension buildering work and keeping within budget and on quote. DAVE HARRI...
From £2,120
We were incorporated in 2015 and have been providing a level of service to our clients that is unparalleled, using knowledge built from 20+ years w...
From £2,504
Thermic Homes is an energy-saving home improvement company operating out of the south coast of England. Our mission is to create warmer homes for t...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in PO15 it ranges from £1,984 (NICK SMITH BUILDERS based in PO15) to £2,504 (Thermic Homes based in PO16).
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 PO15 by posting a job with HaMuch and we will send it to extension builders in PO15.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Fareham | £35 | £250 |
| Install An RSJ near Locks Heath | £33 | £240 |
| Install An RSJ near Lee-on-the-Solent | £35 | £249 |
| Install An RSJ near Hedge End | £34 | £244 |
| Install An RSJ near Gosport | £35 | £246 |
| Install An RSJ near Portsmouth | £36 | £250 |
| Install An RSJ near Waterlooville | £36 | £250 |
| Install An RSJ near Southampton | £34 | £243 |
| Install An RSJ near Horndean | £35 | £253 |
| Install An RSJ near Eastleigh | £34 | £244 |
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 - £17,531

Two storey extension - £88,047

Build a timber frame extension - £26,031

Build a swimming pool - £81,031

Single storey extension - £55,624

Side return extension - £41,851

Install an RSJ - £2,231

Outbuilding - £10,031

Build a Mansard loft conversion - £52,031

Loft conversion - £34,043

Build a kitchen extension - £42,031

Hip to gable loft conversion - £42,031

Granny annexe - £87,031

Garden office - £10,031

Convert a Garage - £16,031

Garage - £18,531

Build a flat roof extension - £22,031

Build a dormer loft conversion - £42,031

Concrete foundations - £6,281

Convert a bungalow loft - £29,031

Convert a basement - £37,851