From £2,304
Need an Extension Builder in BA3? RHayes Roofing has been helping local clients (20 mile radius) with their extension buildering jobs for many year...
From £2,400
Trusted and professional extension builder in BA3. Experienced in all extension buildering work and keeping within budget and on quote. CETH CONSTR...
From £2,072
Need an Extension Builder in BA3? Marptree Design & Build limited has been helping local clients (20 mile radius) with their extension buildering j...
From £2,176
K STOBBS BUILDING CONTRACTOR is an established extension buildering business in BA3. We come highly recommended and provide competitive quotes for ...
From £2,272
BURNELL BUILDERS LTD is an established extension buildering business in BA3. We come highly recommended and provide competitive quotes for your wor...
From £2,016
Experienced extension builder ready to quote for your work. J CROZIER (BUILDERS) LTD is the best extension builder in BA3. No obligation free quote...
From £2,128
Need an Extension Builder in BA3? Wattsfield Construction has been helping local clients (20 mile radius) with their extension buildering jobs for ...
From £3,128
We are a family run small business, we only use fully time served tradespeople. Having been building for 22years a still having a passion for quali...
From £2,168
Our building services company Wellsway Building Company was established in 2017. Since then we have been helping customers in Bath and the surround...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in BA3 it ranges from £2,016 (J CROZIER (BUILDERS) LTD based in BA2) to £3,128 (Unique Design & Build based in BS39).
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 BA3 by posting a job with HaMuch and we will send it to extension builders in BA3.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Bath | £32 | £249 |
| Install An RSJ near Frome | £33 | £263 |
| Install An RSJ near Keynsham | £33 | £251 |
| Install An RSJ near Trowbridge | £34 | £266 |
| Install An RSJ near Kingswood | £34 | £257 |
| Install An RSJ near Bristol | £33 | £255 |
| Install An RSJ near Clifton | £33 | £255 |
| Install An RSJ near North Somerset | £32 | £245 |
| Install An RSJ near South Gloucestershire | £34 | £260 |
| Install An RSJ near Chippenham | £34 | £258 |
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 - £17,616

Two storey extension - £88,174

Build a timber frame extension - £26,116

Build a swimming pool - £81,116

Single storey extension - £57,320

Side return extension - £42,805

Install an RSJ - £2,316

Outbuilding - £10,116

Build a Mansard loft conversion - £52,116

Loft conversion - £34,838

Build a kitchen extension - £42,116

Hip to gable loft conversion - £42,116

Granny annexe - £87,116

Garden office - £10,116

Convert a Garage - £16,116

Garage - £18,616

Build a flat roof extension - £22,116

Build a dormer loft conversion - £42,116

Concrete foundations - £6,366

Convert a bungalow loft - £29,116

Convert a basement - £38,805