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Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
S ROBERTS ROOFING are here to help customers who need an Extension Builder in St Asaph. We offer a competitive rate to complete all your extension ...
Robert Wilson
Wood floor services is a trusted extension builder serving customers in St Asaph and the surrounding area. Contact us to today to get a competitiv...
From £1,616
John Foster
Octagon Construction Ltd is a trusted extension builder serving customers in St Asaph and the surrounding area. Contact us to today to get a compet...
From £1,648
Shaun Davies
We are a company with over 30 years of experience. Who pride ourselves by providing a honest reliable service

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 £1,616 (Octagon Construction Ltd based in LL18) to £2,072 (Brothers Construction based in LL18).
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 - £17,105

Two storey extension - £87,407

Build a timber frame extension - £25,605

Build a swimming pool - £80,605

Single storey extension - £47,096

Side return extension - £37,054

Install an RSJ - £1,805

Outbuilding - £9,605

Build a Mansard loft conversion - £51,605

Loft conversion - £30,045

Build a kitchen extension - £41,605

Hip to gable loft conversion - £41,605

Granny annexe - £86,605

Garden office - £9,605

Convert a Garage - £15,605

Garage - £18,105

Build a flat roof extension - £21,605

Build a dormer loft conversion - £41,605

Concrete foundations - £5,855

Convert a bungalow loft - £28,605

Convert a basement - £33,054