From £2,344
Bailey Construction Services are here to help customers who need an Extension Builder in SO16. We offer a competitive rate to complete all your ext...
From £2,104
Our building services company KT Carpentry & Building Services has been helping customers in Southampton, Winchester, Brockenhurst and Portsmouth b...
From £2,160
Experienced extension builder ready to quote for your work. LMR BUILDING SERVICES LIMITED is the best extension builder in SO16. No obligation free...
From £2,128
Relax... you have found a reliable extension builder in SO16. 1st Oak Building Preservation & Maintenance is a friendly and reliable company based ...
From £2,120
Need to find an Extension Builder near you for all your extension buildering work?
DSH Roofing provides a local, trusted extension builderi...
From £2,280
Experienced extension builder ready to quote for your work. Shay building LTD is the best extension builder in SO16. No obligation free quotes and ...
From £2,184
Need an Extension Builder in SO16? T & S Construction has been helping local clients (20 mile radius) with their extension buildering jobs for many...
From £1,968
Need to find an Extension Builder near you for all your extension buildering work?
Mark Mckie provides a local, trusted extension builderin...
From £1,928
Hestia Trustins LTD are here to help customers who need an Extension Builder in SO16. We offer a competitive rate to complete all your extension bu...
From £2,392
We are a Design and Build company based in Hampshire. Proud of our roots, we try to be the very best in the way we go about our business. Friendly...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SO16 it ranges from £1,928 (Hestia Trustins LTD based in SO14) to £2,392 (AAConcepts based in SO14).
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 SO16 by posting a job with HaMuch and we will send it to extension builders in SO16.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Southampton | £30 | £215 |
| Install An RSJ near Eastleigh | £30 | £215 |
| Install An RSJ near Totton | £30 | £216 |
| Install An RSJ near Chandler's Ford | £30 | £216 |
| Install An RSJ near Romsey | £28 | £203 |
| Install An RSJ near Hedge End | £30 | £215 |
| Install An RSJ near Locks Heath | £30 | £213 |
| Install An RSJ near New Forest | £28 | £211 |
| Install An RSJ near Winchester | £31 | £225 |
| Install An RSJ near Fareham | £31 | £217 |
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 - £17,461

Two storey extension - £87,941

Build a timber frame extension - £25,961

Build a swimming pool - £80,961

Single storey extension - £54,216

Side return extension - £41,059

Install an RSJ - £2,161

Outbuilding - £9,961

Build a Mansard loft conversion - £51,961

Loft conversion - £33,383

Build a kitchen extension - £41,961

Hip to gable loft conversion - £41,961

Granny annexe - £86,961

Garden office - £9,961

Convert a Garage - £15,961

Garage - £18,461

Build a flat roof extension - £21,961

Build a dormer loft conversion - £41,961

Concrete foundations - £6,211

Convert a bungalow loft - £28,961

Convert a basement - £37,059