From £2,392
Trusted and professional extension builder in SO31. Experienced in all extension buildering work and keeping within budget and on quote. A W PAVING...
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 £2,160
ROB DINE CONSTRUCTION is an established and experienced local extension builder in SO31. Please contact us for a free, no obligation quote and comp...
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 £2,336
Claytons Building and Roofing are here to help customers who need an Extension Builder in SO31. We offer a competitive rate to complete all your ex...
From £2,168
Trusted and professional extension builder in SO31. Experienced in all extension buildering work and keeping within budget and on quote. Andy's Bui...
From £1,984
NICK SMITH BUILDERS is an established extension buildering business in SO31. 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 £2,176
O NEILL CONSTRUCTION LTD is an established extension buildering business in SO31. We come highly recommended and provide competitive quotes for you...
From £1,952
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SO31 it ranges from £1,952 (Steve Lovett Builders based in SO18) to £2,392 (A W PAVING LTD based in SO31).
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 SO31 by posting a job with HaMuch and we will send it to extension builders in SO31.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Locks Heath | £30 | £213 |
| Install An RSJ near Hedge End | £30 | £215 |
| Install An RSJ near Fareham | £31 | £217 |
| Install An RSJ near Southampton | £30 | £215 |
| Install An RSJ near Lee-on-the-Solent | £31 | £217 |
| Install An RSJ near Eastleigh | £30 | £215 |
| Install An RSJ near Gosport | £30 | £215 |
| Install An RSJ near Chandler's Ford | £30 | £216 |
| Install An RSJ near Totton | £30 | £216 |
| Install An RSJ near Portsmouth | £31 | £216 |
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 - £17,485

Two storey extension - £87,977

Build a timber frame extension - £25,985

Build a swimming pool - £80,985

Single storey extension - £54,696

Side return extension - £41,329

Install an RSJ - £2,185

Outbuilding - £9,985

Build a Mansard loft conversion - £51,985

Loft conversion - £33,608

Build a kitchen extension - £41,985

Hip to gable loft conversion - £41,985

Granny annexe - £86,985

Garden office - £9,985

Convert a Garage - £15,985

Garage - £18,485

Build a flat roof extension - £21,985

Build a dormer loft conversion - £41,985

Concrete foundations - £6,235

Convert a bungalow loft - £28,985

Convert a basement - £37,329