From £2,160
M K Builders Medway Ltd is an established extension buildering business in ME4. We come highly recommended and provide competitive quotes for your ...
From £2,104
Zeppelin Construction Ltd is a construction company based in Gillingham, Kent. We offer a wide range of construction services to both domestic and ...
From £2,144
Top Form Construction are here to help customers who need an Extension Builder in ME4. We offer a competitive rate to complete all your extension b...
From £2,176
Freeman V & Co are here to help customers who need an Extension Builder in ME4. We offer a competitive rate to complete all your extension builderi...
From £2,160
Need to find an Extension Builder near you for all your extension buildering work?
McCready's Lofts & Refurbishments provides a local, trus...
From £2,400
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,064
G J Roofing Services is an established and experienced local extension builder in ME4. Please contact us for a free, no obligation quote and compet...
From £2,280
We are a family run business with over 30 years experience in the roofing industry. We pride ourselves on our high standards of workmanship and cus...
From £2,240
Relax... you have found a reliable extension builder in ME4. CLEAN ROOM CONSTRUCTION LTD is a friendly and reliable company based in ME4 who consid...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in ME4 it ranges from £2,064 (G J Roofing Services based in ME1) to £2,624 (Des Durant General Building based in ME5).
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 ME4 by posting a job with HaMuch and we will send it to extension builders in ME4.
"RSJ installation, 203/203/46 beam length 5150mm, also digging concrete pad 900x900x 600 deep for site support post. For more information please get in touch." - RAINHAM
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Chatham | £34 | £220 |
| Install An RSJ near Gillingham | £34 | £219 |
| Install An RSJ near Rochester | £34 | £220 |
| Install An RSJ near Larkfield | £36 | £224 |
| Install An RSJ near Gravesend | £35 | £227 |
| Install An RSJ near Maidstone | £36 | £226 |
| Install An RSJ near Northfleet | £35 | £227 |
| Install An RSJ near Sittingbourne | £31 | £217 |
| Install An RSJ near Canvey Island | £34 | £224 |
| Install An RSJ near Stanford-le-Hope | £35 | £222 |
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 - £17,535

Two storey extension - £88,053

Build a timber frame extension - £26,035

Build a swimming pool - £81,035

Single storey extension - £55,704

Side return extension - £41,896

Install an RSJ - £2,235

Outbuilding - £10,035

Build a Mansard loft conversion - £52,035

Loft conversion - £34,080

Build a kitchen extension - £42,035

Hip to gable loft conversion - £42,035

Granny annexe - £87,035

Garden office - £10,035

Convert a Garage - £16,035

Garage - £18,535

Build a flat roof extension - £22,035

Build a dormer loft conversion - £42,035

Concrete foundations - £6,285

Convert a bungalow loft - £29,035

Convert a basement - £37,896