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Select your affordable City Of Westminster extension builder
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in City Of Westminster. No obligat...
Robert Buci
Buci builders ltd is a trusted extension builder serving customers in City Of Westminster and the surrounding area. Contact us to today to get a co...
Relax... you have found a reliable extension builder in City Of Westminster. L H Builders is a friendly and reliable company based in City Of Westm...
HARLEY BUILDING SERVICES LTD are here to help customers who need an Extension Builder in City Of Westminster. We offer a competitive rate to comple...
D Bradshaw Building Renovation is a trusted extension builder serving customers in City Of Westminster and the surrounding area. Contact us to toda...
Samuele Paolini
Need an Extension Builder in City Of Westminster? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering j...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
V.S.P is a trusted extension builder serving customers in City Of Westminster and the surrounding area. Contact us to today to get a competitive qu...
Jonathan Rimmer
Experienced extension builder ready to quote for your work. Mr is the best extension builder in City Of Westminster. No obligation free quotes and ...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in City Of Westminster it ranges from £2,104 (V.S.P based in NW10) to £3,224 (Buci builders ltd based in SE27).
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 City Of Westminster by posting a job with HaMuch and we will send it to extension builders in City Of Westminster.
"RSJ re-installation" - N16, job posted 04/10/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near London | £43 | £273 |
| Install An RSJ near Camden Town | £44 | £277 |
| Install An RSJ near Belgravia | £44 | £276 |
| Install An RSJ near Chelsea | £44 | £276 |
| Install An RSJ near Lambeth | £44 | £275 |
| Install An RSJ near Kensington | £44 | £277 |
| Install An RSJ near Islington | £45 | £276 |
| Install An RSJ near Fulham | £44 | £278 |
| Install An RSJ near Camberwell | £44 | £276 |
| Install An RSJ near Bethnal Green | £45 | £276 |
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 - £17,718

Two storey extension - £88,326

Build a timber frame extension - £26,218

Build a swimming pool - £81,218

Single storey extension - £59,352

Side return extension - £43,948

Install an RSJ - £2,418

Outbuilding - £10,218

Build a Mansard loft conversion - £52,218

Loft conversion - £35,790

Build a kitchen extension - £42,218

Hip to gable loft conversion - £42,218

Granny annexe - £87,218

Garden office - £10,218

Convert a Garage - £16,218

Garage - £18,718

Build a flat roof extension - £22,218

Build a dormer loft conversion - £42,218

Concrete foundations - £6,468

Convert a bungalow loft - £29,218

Convert a basement - £39,948