From £2,352
Need an Extension Builder in SP1? Moores Build has been helping local clients (20 mile radius) with their extension buildering jobs for many years....
From £2,336
Arkson builders ltd is an established and experienced local extension builder in SP1. Please contact us for a free, no obligation quote and competi...
From £2,512
Shape Project Management is an established and experienced local extension builder in SP1. Please contact us for a free, no obligation quote and co...
From £2,664
Feltham Group Services Limited is an established extension buildering business in SP1. We come highly recommended and provide competitive quotes fo...
From £2,240
Need an Extension Builder in SP1? BARTITIONS DESIGN & BUILD LTD has been helping local clients (20 mile radius) with their extension buildering jo...
From £2,304
JJ Acquisitions ltd is a trusted extension builder serving customers in SP1 and the surrounding area. Contact us to today to get a competitive quot...
From £2,072
Need to find an Extension Builder near you for all your extension buildering work?
R F S BUILDERS provides a local, trusted extension build...
From £2,408
STEWART BUILDERS is an established and experienced local extension builder in SP1. Please contact us for a free, no obligation quote and competitiv...
From £1,048
We specialise in Epoxy Resin and Polyurethane floor coatings and screeds (very durable and seamless flooring), designed for retail, factories, manu...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SP1 it ranges from £1,048 (Floortrak Limited based in SO51) to £2,664 (Feltham Group Services Limited based in SP5).
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 SP1 by posting a job with HaMuch and we will send it to extension builders in SP1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Salisbury | £35 | £247 |
| Install An RSJ near Test Valley | £37 | £261 |
| Install An RSJ near Romsey | £32 | £230 |
| Install An RSJ near New Forest | £32 | £245 |
| Install An RSJ near Andover | £40 | £248 |
| Install An RSJ near Totton | £34 | £243 |
| Install An RSJ near Chandler's Ford | £34 | £245 |
| Install An RSJ near Eastleigh | £34 | £244 |
| Install An RSJ near Devizes | £32 | £242 |
| Install An RSJ near Southampton | £34 | £243 |
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 - £17,445

Two storey extension - £87,917

Build a timber frame extension - £25,945

Build a swimming pool - £80,945

Single storey extension - £53,896

Side return extension - £40,879

Install an RSJ - £2,145

Outbuilding - £9,945

Build a Mansard loft conversion - £51,945

Loft conversion - £33,233

Build a kitchen extension - £41,945

Hip to gable loft conversion - £41,945

Granny annexe - £86,945

Garden office - £9,945

Convert a Garage - £15,945

Garage - £18,445

Build a flat roof extension - £21,945

Build a dormer loft conversion - £41,945

Concrete foundations - £6,195

Convert a bungalow loft - £28,945

Convert a basement - £36,879