From £2,232
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 £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...
From £2,024
Christian Builders Margate Ltd is a multi-service company founded by Nick Christian. We operate with a highly skilled team of designers, tradesmen,...
From £1,832
GDB CONSTRUCTION is a trusted extension builder serving customers in Thanet and the surrounding area. Contact us to today to get a competitive quot...
From £1,512
All building work , all hoyse maintenance. House extension and refurbishment works.
From £1,800
Relax... you have found a reliable extension builder in Thanet. Paragon Stone Design is a friendly and reliable company based in Thanet who conside...
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 £1,640
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...
From £1,944
Need to find an Extension Builder near you for all your extension buildering work?
Bespoke building projects provides a local, trusted exte...
From £1,832
Design – our highly experienced design team can help you visualise your dream outcomes, working sympathetically with your space to find the perfe...

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 | £207 |
| 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 - £17,165

Two storey extension - £87,497

Build a timber frame extension - £25,665

Build a swimming pool - £80,665

Single storey extension - £48,296

Side return extension - £37,729

Install an RSJ - £1,865

Outbuilding - £9,665

Build a Mansard loft conversion - £51,665

Loft conversion - £30,608

Build a kitchen extension - £41,665

Hip to gable loft conversion - £41,665

Granny annexe - £86,665

Garden office - £9,665

Convert a Garage - £15,665

Garage - £18,165

Build a flat roof extension - £21,665

Build a dormer loft conversion - £41,665

Concrete foundations - £5,915

Convert a bungalow loft - £28,665

Convert a basement - £33,729