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Select your affordable CT10 extension builder
At Wells & Co we offer a comprehensive building service. We specialise in Period properties, bespoke renovations and steel fabrication.Along with o...
GDB CONSTRUCTION is a trusted extension builder serving customers in CT10 and the surrounding area. Contact us to today to get a competitive quote ...
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 CT10. Please contact us for a free, no obligation quot...
From £2,128
Teekay solutions Limited is an established and experienced local extension builder in CT10. Please contact us for a free, no obligation quote and c...
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...
From £1,800
Relax... you have found a reliable extension builder in CT10. Paragon Stone Design is a friendly and reliable company based in CT10 who consider no...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CT10 it ranges from £1,640 (FRK Building Services based in CT12) 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 CT10 by posting a job with HaMuch and we will send it to extension builders in CT10.
"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 01/08/26
"RSJ installation, knock internal walls down in kitchen" - CT9, job posted 20/12/24
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Broadstairs | £27 | £208 |
| Install An RSJ near Ramsgate | £27 | £208 |
| Install An RSJ near Margate | £27 | £208 |
| Install An RSJ near Thanet | £27 | £207 |
| Install An RSJ near Deal | £26 | £199 |
| Install An RSJ near Herne Bay | £28 | £213 |
| Install An RSJ near Canterbury | £31 | £232 |
| Install An RSJ near Dover | £29 | £226 |
| Install An RSJ near Whitstable | £28 | £214 |
| Install An RSJ near Folkestone | £31 | £233 |
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 - £17,208

Two storey extension - £87,562

Build a timber frame extension - £25,708

Build a swimming pool - £80,708

Single storey extension - £49,160

Side return extension - £38,215

Install an RSJ - £1,908

Outbuilding - £9,708

Build a Mansard loft conversion - £51,708

Loft conversion - £31,013

Build a kitchen extension - £41,708

Hip to gable loft conversion - £41,708

Granny annexe - £86,708

Garden office - £9,708

Convert a Garage - £15,708

Garage - £18,208

Build a flat roof extension - £21,708

Build a dormer loft conversion - £41,708

Concrete foundations - £5,958

Convert a bungalow loft - £28,708

Convert a basement - £34,215