From £2,080
Member since June 2026
We Fix We Build Kent is a premier, full-service high-end maintenance and building company. We streamline your project by providing all trades under...
From £2,528
JLS Contstruction is an established and experienced local extension builder in ME15. Please contact us for a free, no obligation quote and competit...
From £2,136
Experienced extension builder ready to quote for your work. Direct Build Ltd is the best extension builder in ME15. No obligation free quotes and m...
From £2,424
Relax... you have found a reliable extension builder in ME15. Timberlogbuild LTD is a friendly and reliable company based in ME15 who consider no j...
From £1,928
Experienced extension builder ready to quote for your work. Lande Solutions Ltd is the best extension builder in ME15. No obligation free quotes an...
From £2,120
Alpha Projects Ltd are here to help customers who need an Extension Builder in ME15. We offer a competitive rate to complete all your extension bui...
From £2,288
Need an Extension Builder in ME15? Terlecki Ltd has been helping local clients (20 mile radius) with their extension buildering jobs for many years...
From £2,280
We thrive on a challenge, and really enjoy working with our client's to provide a high quality finished product within the budget required. Whether...
From £2,168
JOHN KNOWLES BUILDING SERVICES are here to help customers who need an Extension Builder in ME15. We offer a competitive rate to complete all your e...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in ME15 it ranges from £1,568 (Rafs based in ME15) to £2,528 (JLS Contstruction based in ME15).
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 ME15 by posting a job with HaMuch and we will send it to extension builders in ME15.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Maidstone | £36 | £226 |
| Install An RSJ near Larkfield | £36 | £224 |
| Install An RSJ near Rochester | £34 | £220 |
| Install An RSJ near Gillingham | £34 | £219 |
| Install An RSJ near Chatham | £34 | £220 |
| Install An RSJ near Sittingbourne | £31 | £217 |
| Install An RSJ near Tonbridge | £33 | £226 |
| Install An RSJ near Swale | £31 | £214 |
| Install An RSJ near Gravesend | £35 | £227 |
| Install An RSJ near Tunbridge Wells | £33 | £228 |
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 - £17,452

Two storey extension - £87,928

Build a timber frame extension - £25,952

Build a swimming pool - £80,952

Single storey extension - £54,040

Side return extension - £40,960

Install an RSJ - £2,152

Outbuilding - £9,952

Build a Mansard loft conversion - £51,952

Loft conversion - £33,300

Build a kitchen extension - £41,952

Hip to gable loft conversion - £41,952

Granny annexe - £86,952

Garden office - £9,952

Convert a Garage - £15,952

Garage - £18,452

Build a flat roof extension - £21,952

Build a dormer loft conversion - £41,952

Concrete foundations - £6,202

Convert a bungalow loft - £28,952

Convert a basement - £36,960