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Trowel On is an established extension buildering business in SO40. We come highly recommended and provide competitive quotes for your work.
From £2,128
GDS Building & Maintenance Ltd is an established and experienced local extension builder in SO40. Please contact us for a free, no obligation quote...
From £2,128
Relax... you have found a reliable extension builder in SO40. 1st Oak Building Preservation & Maintenance is a friendly and reliable company based ...
From £2,312
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,104
Our building services company KT Carpentry & Building Services has been helping customers in Southampton, Winchester, Brockenhurst and Portsmouth b...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SO40 it ranges from £2,056 (Trowel On based in SO40) to £2,312 (Safespec Building Services Limited based in SO40).
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 SO40 by posting a job with HaMuch and we will send it to extension builders in SO40.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Totton | £34 | £243 |
| Install An RSJ near Southampton | £34 | £243 |
| Install An RSJ near Romsey | £32 | £230 |
| Install An RSJ near New Forest | £32 | £245 |
| Install An RSJ near Eastleigh | £34 | £244 |
| Install An RSJ near Chandler's Ford | £34 | £245 |
| Install An RSJ near Hedge End | £34 | £244 |
| Install An RSJ near Locks Heath | £33 | £240 |
| Install An RSJ near Winchester | £39 | £283 |
| Install An RSJ near Fareham | £35 | £250 |
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 - £17,446

Two storey extension - £87,918

Build a timber frame extension - £25,946

Build a swimming pool - £80,946

Single storey extension - £53,912

Side return extension - £40,888

Install an RSJ - £2,146

Outbuilding - £9,946

Build a Mansard loft conversion - £51,946

Loft conversion - £33,240

Build a kitchen extension - £41,946

Hip to gable loft conversion - £41,946

Granny annexe - £86,946

Garden office - £9,946

Convert a Garage - £15,946

Garage - £18,446

Build a flat roof extension - £21,946

Build a dormer loft conversion - £41,946

Concrete foundations - £6,196

Convert a bungalow loft - £28,946

Convert a basement - £36,888