From £2,144
Experienced extension builder ready to quote for your work. H H Builders is the best extension builder in BH23. No obligation free quotes and many ...
From £2,040
Relax... you have found a reliable extension builder in BH23. First Alpha Home Improvements Ltd is a friendly and reliable company based in BH23 wh...
From £2,272
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,424
Elmer Building Services ltd is an established extension buildering business in BH23. We come highly recommended and provide competitive quotes for ...
From £2,360
A design and build service for commercial or residential properties. House of Tigerhorse is the design arm of Broad Construction which together of...
From £2,176
Our building services company Colin Sloper General Builder has twenty five years’ experience and have been helping customers in Dorset and the su...
From £2,168
pantlin construction ltd are here to help customers who need an Extension Builder in BH23. We offer a competitive rate to complete all your extensi...
From £1,992
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,416
Need an Extension Builder in BH23? Upscale Home Improvements has been helping local clients (20 mile radius) with their extension buildering jobs f...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in BH23 it ranges from £1,992 (J F DEWHIRST & CO based in BH6) to £2,704 (Zeneli Builders based in BH23).
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 BH23 by posting a job with HaMuch and we will send it to extension builders in BH23.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Christchurch | £36 | £251 |
| Install An RSJ near Bournemouth | £38 | £257 |
| Install An RSJ near Poole | £38 | £250 |
| Install An RSJ near New Forest | £32 | £245 |
| Install An RSJ near Totton | £34 | £243 |
| Install An RSJ near Southampton | £34 | £243 |
| Install An RSJ near Isle of Wight | £34 | £246 |
| Install An RSJ near Romsey | £32 | £230 |
| Install An RSJ near Locks Heath | £33 | £240 |
| Install An RSJ near Salisbury | £35 | £247 |
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 - £17,570

Two storey extension - £88,104

Build a timber frame extension - £26,070

Build a swimming pool - £81,070

Single storey extension - £56,392

Side return extension - £42,283

Install an RSJ - £2,270

Outbuilding - £10,070

Build a Mansard loft conversion - £52,070

Loft conversion - £34,403

Build a kitchen extension - £42,070

Hip to gable loft conversion - £42,070

Granny annexe - £87,070

Garden office - £10,070

Convert a Garage - £16,070

Garage - £18,570

Build a flat roof extension - £22,070

Build a dormer loft conversion - £42,070

Concrete foundations - £6,320

Convert a bungalow loft - £29,070

Convert a basement - £38,283