From £1,848
Need an Extension Builder in St Asaph? P WALKER JOINERY & BUILDING has been helping local clients (20 mile radius) with their extension buildering ...
From £2,048
Need to find an Extension Builder near you for all your extension buildering work?
S.L.P Property Maintenance provides a local, trusted ext...
From £2,072
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,776
, LL28
Relax... you have found a reliable extension builder in St Asaph. UK Leisure Living Ltd is a friendly and reliable company based in St Asaph who co...
From £2,000
Need an Extension Builder in St Asaph? Chris's Roofing & Property Maintenance has been helping local clients (20 mile radius) with their extension ...
From £2,080
Danny Anderson Builder is an established extension buildering business in St Asaph. We come highly recommended and provide competitive quotes for y...
From £1,944
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £1,936
Need an Extension Builder in St Asaph? PK.Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many ye...
From £1,592
SJBuild Ltd is an established and experienced local extension builder in St Asaph. Please contact us for a free, no obligation quote and competitiv...
From £2,152
Trusted and professional extension builder in St Asaph. Experienced in all extension buildering work and keeping within budget and on quote. DW Bri...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in St Asaph it ranges from £1,592 (SJBuild Ltd based in CH63) to £2,152 (DW Brickwork based in CH46).
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 St Asaph by posting a job with HaMuch and we will send it to extension builders in St Asaph.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Rhyl | £28 | £209 |
| Install An RSJ near Prestatyn | £29 | £213 |
| Install An RSJ near Colwyn Bay | £28 | £211 |
| Install An RSJ near Flintshire | £33 | £224 |
| Install An RSJ near Heswall | £30 | £213 |
| Install An RSJ near Connah's Quay | £33 | £229 |
| Install An RSJ near Llandudno | £28 | £211 |
| Install An RSJ near Conway | £28 | £211 |
| Install An RSJ near Conwy | £28 | £211 |
| Install An RSJ near Wirral | £31 | £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 - £17,245

Two storey extension - £87,617

Build a timber frame extension - £25,745

Build a swimming pool - £80,745

Single storey extension - £49,896

Side return extension - £38,629

Install an RSJ - £1,945

Outbuilding - £9,745

Build a Mansard loft conversion - £51,745

Loft conversion - £31,358

Build a kitchen extension - £41,745

Hip to gable loft conversion - £41,745

Granny annexe - £86,745

Garden office - £9,745

Convert a Garage - £15,745

Garage - £18,245

Build a flat roof extension - £21,745

Build a dormer loft conversion - £41,745

Concrete foundations - £5,995

Convert a bungalow loft - £28,745

Convert a basement - £34,629