From £2,248
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in TN16. No obligation free quotes...
1 review
From £2,392
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
From £2,352
I am a qualified, builder, electrician and plumber. I have been working in the construction industry for over 23 years and have built everything fr...
From £3,224
Buci builders ltd is a trusted extension builder serving customers in TN16 and the surrounding area. Contact us to today to get a competitive quote...
From £2,512
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in TN16. Please contact us for a free, no obliga...
From £2,392
Gb construction are here to help customers who need an Extension Builder in TN16. We offer a competitive rate to complete all your extension build...
From £3,400
Member since August 2025
Banga decoration. Is Base in south London for number of year Banga decoration is a small company. Wich provide an excellent job to the custom...
From £2,384
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in TN16. No obligation free quotes and ...
From £2,384
Relax... you have found a reliable extension builder in TN16. First guard Roofing is a friendly and reliable company based in TN16 who consider no ...
From £2,816
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in TN16 and the surrounding area. Contact us to today to get a com...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in TN16 it ranges from £2,248 (J&J Building Solutions based in SW16) to £3,400 (Banga Decoration based in CR7).
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 TN16 by posting a job with HaMuch and we will send it to extension builders in TN16.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Caterham | £43 | £272 |
| Install An RSJ near Sevenoaks | £38 | £234 |
| Install An RSJ near Croydon | £43 | £267 |
| Install An RSJ near Bromley | £42 | £265 |
| Install An RSJ near Redhill | £41 | £269 |
| Install An RSJ near Bexley | £42 | £265 |
| Install An RSJ near Reigate & Banstead | £41 | £271 |
| Install An RSJ near Sutton | £43 | £273 |
| Install An RSJ near Lewisham | £43 | £268 |
| Install An RSJ near Reigate | £40 | £270 |
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 - £17,910

Two storey extension - £88,616

Build a timber frame extension - £26,410

Build a swimming pool - £81,410

Single storey extension - £63,208

Side return extension - £46,117

Install an RSJ - £2,610

Outbuilding - £10,410

Build a Mansard loft conversion - £52,410

Loft conversion - £37,598

Build a kitchen extension - £42,410

Hip to gable loft conversion - £42,410

Granny annexe - £87,410

Garden office - £10,410

Convert a Garage - £16,410

Garage - £18,910

Build a flat roof extension - £22,410

Build a dormer loft conversion - £42,410

Concrete foundations - £6,660

Convert a bungalow loft - £29,410

Convert a basement - £42,117