Relax... you have found a reliable extension builder in Knowle. Tucker Construction is a friendly and reliable company based in Knowle who consider...
SM&S General Property Repairs is a trusted extension builder serving customers in Knowle and the surrounding area. Contact us to today to get a com...
Gary Wilson
Reliable person 25 years experience
if you look on a website rated people and have a look at my ratings
Need to find an Extension Builder near you for all your extension buildering work?
BAKER CONSTRUCTION provides a local, trusted extension b...
Need to find an Extension Builder near you for all your extension buildering work?
Avonvale Garage Doors provides a local, trusted extensio...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Ben Birch
I have been in the building industry for 28 years and have carried out extensions,loft conversions, knock throughs, plastering, carpentry,roofing a...
Relax... you have found a reliable extension builder in Knowle. F.I.I Building Services Ltd is a friendly and reliable company based in Knowle who ...
Benton Builders is an established and experienced local extension builder in Knowle. Please contact us for a free, no obligation quote and competit...
Building Beautiful Homes Since 1980Welcome to Oakwood Construction. Here in the heart of the Midlands, we are more than simply your new home builde...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Knowle it ranges from £1,904 (Oakwood Construction based in CV4) to £2,264 (MYBUILD based in B93).
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 Knowle by posting a job with HaMuch and we will send it to extension builders in Knowle.
"Total cost of structural engineer report, supply and install 6M RSJ for a load bearing wall to make kitchen/diner." - B90, job posted 01/11/25
"RSJ installation" - B90, job posted 03/08/26
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Knowle | £31 | £241 |
| Install An RSJ near Solihull | £29 | £231 |
| Install An RSJ near Kenilworth | £29 | £223 |
| Install An RSJ near Coventry | £28 | £221 |
| Install An RSJ near Warwick | £28 | £213 |
| Install An RSJ near Birmingham | £28 | £226 |
| Install An RSJ near Leamington Spa | £27 | £212 |
| Install An RSJ near Sutton Coldfield | £29 | £228 |
| Install An RSJ near Smethwick | £28 | £225 |
| Install An RSJ near Bedworth | £28 | £219 |
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 - £17,347

Two storey extension - £87,771

Build a timber frame extension - £25,847

Build a swimming pool - £80,847

Single storey extension - £51,944

Side return extension - £39,781

Install an RSJ - £2,047

Outbuilding - £9,847

Build a Mansard loft conversion - £51,847

Loft conversion - £32,318

Build a kitchen extension - £41,847

Hip to gable loft conversion - £41,847

Granny annexe - £86,847

Garden office - £9,847

Convert a Garage - £15,847

Garage - £18,347

Build a flat roof extension - £21,847

Build a dormer loft conversion - £41,847

Concrete foundations - £6,097

Convert a bungalow loft - £28,847

Convert a basement - £35,781