From £2,864
Joe Rendell
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,440
Harmony contractor's is an established and experienced local extension builder in TN27. Please contact us for a free, no obligation quote and compe...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in TN27 it ranges from £2,440 (Harmony contractor's based in TN27) to £2,864 (JR Building Services based in TN27).
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 TN27 by posting a job with HaMuch and we will send it to extension builders in TN27.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Ashford | £36 | £256 |
| Install An RSJ near Maidstone | £40 | £255 |
| Install An RSJ near Swale | £35 | £241 |
| Install An RSJ near Sittingbourne | £35 | £246 |
| Install An RSJ near Faversham | £34 | £235 |
| Install An RSJ near Larkfield | £41 | £253 |
| Install An RSJ near Gillingham | £39 | £253 |
| Install An RSJ near Chatham | £39 | £254 |
| Install An RSJ near Rochester | £39 | £254 |
| Install An RSJ near Hythe | £31 | £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 - £17,952

Two storey extension - £88,678

Build a timber frame extension - £26,452

Build a swimming pool - £81,452

Single storey extension - £64,040

Side return extension - £46,585

Install an RSJ - £2,652

Outbuilding - £10,452

Build a Mansard loft conversion - £52,452

Loft conversion - £37,988

Build a kitchen extension - £42,452

Hip to gable loft conversion - £42,452

Granny annexe - £87,452

Garden office - £10,452

Convert a Garage - £16,452

Garage - £18,952

Build a flat roof extension - £22,452

Build a dormer loft conversion - £42,452

Concrete foundations - £6,702

Convert a bungalow loft - £29,452

Convert a basement - £42,585