From £2,000
viking build is an established extension buildering business in DN15. We come highly recommended and provide competitive quotes for your work.
...From £1,680
Experienced extension builder ready to quote for your work. Northfield General Builders Ltd is the best extension builder in DN15. No obligation fr...
From £2,144
Trusted and professional extension builder in DN15. Experienced in all extension buildering work and keeping within budget and on quote. Jaymi Wrig...
From £1,800
A Kemp Build is a trusted extension builder serving customers in DN15 and the surrounding area. Contact us to today to get a competitive quote for ...
From £1,752
Marhsall is an established extension buildering business in DN15. We come highly recommended and provide competitive quotes for your work.
From £1,840
Relax... you have found a reliable extension builder in DN15. PASUDA BUILDINGS LTD is a friendly and reliable company based in DN15 who consider no...
From £2,152
PASUDA BUILDINGS LTD is an established and experienced local extension builder in DN15. Please contact us for a free, no obligation quote and compe...
From £1,840
C.L.Corfield Ltd are a well estblished (1963) family run business, who take great pride in providing a quality service. Our services over the years...
From £1,784
Gerard & Huby Building Specialist are here to help customers who need an Extension Builder in DN15. We offer a competitive rate to complete all you...
From £2,216
ABBS Building & Plastics are here to help customers who need an Extension Builder in DN15. We offer a competitive rate to complete all your extensi...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in DN15 it ranges from £1,680 (Northfield General Builders Ltd based in DN17) to £2,216 (ABBS Building & Plastics based in DN14).
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 DN15 by posting a job with HaMuch and we will send it to extension builders in DN15.
"RSJ installation to support a chimney which has been removed" - DN16, job posted 04/12/26
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Scunthorpe | £26 | £207 |
| Install An RSJ near North Lincolnshire | £28 | £216 |
| Install An RSJ near Willerby | £29 | £221 |
| Install An RSJ near Goole | £26 | £217 |
| Install An RSJ near Gainsborough | £30 | £234 |
| Install An RSJ near Hull | £29 | £223 |
| Install An RSJ near East Riding | £29 | £223 |
| Install An RSJ near Beverley | £29 | £223 |
| Install An RSJ near Selby | £30 | £240 |
| Install An RSJ near Doncaster | £29 | £238 |
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 - £17,221

Two storey extension - £87,581

Build a timber frame extension - £25,721

Build a swimming pool - £80,721

Single storey extension - £49,416

Side return extension - £38,359

Install an RSJ - £1,921

Outbuilding - £9,721

Build a Mansard loft conversion - £51,721

Loft conversion - £31,133

Build a kitchen extension - £41,721

Hip to gable loft conversion - £41,721

Granny annexe - £86,721

Garden office - £9,721

Convert a Garage - £15,721

Garage - £18,221

Build a flat roof extension - £21,721

Build a dormer loft conversion - £41,721

Concrete foundations - £5,971

Convert a bungalow loft - £28,721

Convert a basement - £34,359