John Young
Osprey Property Repairs is a trusted extension builder serving customers in Thanet and the surrounding area. Contact us to today to get a competit...
Brendan Healy
All building work , all hoyse maintenance. House extension and refurbishment works.
At Wells & Co we offer a comprehensive building service. We specialise in Period properties, bespoke renovations and steel fabrication.Along with o...
Christian Builders Margate Ltd is a multi-service company founded by Nick Christian. We operate with a highly skilled team of designers, tradesmen,...
GDB CONSTRUCTION is a trusted extension builder serving customers in Thanet and the surrounding area. Contact us to today to get a competitive quot...
Festim Kastrati
We been for almost 15 years in the building trade,
we are easy going and willing to work with our client and to archive the best r...
Need to find an Extension Builder near you for all your extension buildering work?
Bespoke building projects provides a local, trusted exte...
From £2,232
Jordan Pink
Monarch Builders South East Ltd is an established and experienced local extension builder in Thanet. Please contact us for a free, no obligation qu...
From £2,128
Teekay solutions Limited is an established and experienced local extension builder in Thanet. Please contact us for a free, no obligation quote and...
From £1,704
Christian Builders Margate Ltd is an established and experienced local extension builder in Thanet. Please contact us for a free, no obligation quo...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Thanet it ranges from £1,512 (B H G M Ltd based in CT7) to £2,232 (Monarch Builders South East Ltd based in CT9).
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 Thanet by posting a job with HaMuch and we will send it to extension builders in Thanet.
"RSJ installation, knock internal walls down in kitchen" - CT9, job posted 01/01/70
"Extending already existing extension by about a meter with some loft windows, there’s already kitchen extension in place but I want to take it further to the other side, I can provide photos and examples" - CT1, job posted 08/01/26
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Thanet | £27 | £208 |
| Install An RSJ near Margate | £27 | £208 |
| Install An RSJ near Ramsgate | £27 | £208 |
| Install An RSJ near Broadstairs | £27 | £208 |
| Install An RSJ near Herne Bay | £28 | £213 |
| Install An RSJ near Deal | £26 | £199 |
| Install An RSJ near Canterbury | £31 | £232 |
| Install An RSJ near Whitstable | £28 | £214 |
| Install An RSJ near Dover | £29 | £226 |
| Install An RSJ near Faversham | £34 | £235 |
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 - £17,180

Two storey extension - £87,520

Build a timber frame extension - £25,680

Build a swimming pool - £80,680

Single storey extension - £48,600

Side return extension - £37,900

Install an RSJ - £1,880

Outbuilding - £9,680

Build a Mansard loft conversion - £51,680

Loft conversion - £30,750

Build a kitchen extension - £41,680

Hip to gable loft conversion - £41,680

Granny annexe - £86,680

Garden office - £9,680

Convert a Garage - £15,680

Garage - £18,180

Build a flat roof extension - £21,680

Build a dormer loft conversion - £41,680

Concrete foundations - £5,930

Convert a bungalow loft - £28,680

Convert a basement - £33,900