From £2,576
Firman Reece Ltd is an established and experienced local extension builder in Wimbledon. Please contact us for a free, no obligation quote and comp...
From £2,320
London, SW19
Relax... you have found a reliable extension builder in Wimbledon. Design Manage Build is a friendly and reliable company based in Wimbledon who co...
From £2,472
DesignBox Architecture Ltd is a chartered architectural design practice based in South West London. We can offer a full range of architectural serv...
From £2,616
Wimbledon London, SW19
Silverain Limited is an established extension buildering business in Wimbledon. We come highly recommended and provide competitive quotes for your ...
From £2,368
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,520
Greater London, SW19
Experienced extension builder ready to quote for your work. London Dream Building is the best extension builder in Wimbledon. No obligation free qu...
From £2,240
London Dream Building is a London based building and home improvement company, specialising in new build, full house refurbishments, extensions as ...
From £2,136
Surrey, SW19
Trusted and professional extension builder in Wimbledon. Experienced in all extension buildering work and keeping within budget and on quote. Westg...
From £2,616
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,472
Wimbledon Londonderry, SW19
HJPM is an established and experienced local extension builder in Wimbledon. Please contact us for a free, no obligation quote and competitive rate...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Wimbledon it ranges from £2,136 (Westgate & Keele based in SW19) to £2,616 (Silverain Limited based in SW19).
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 Wimbledon by posting a job with HaMuch and we will send it to extension builders in Wimbledon.
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| Install An RSJ in Wimbledon |
| Install An RSJ in Merton |
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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 - £17,734

Two storey extension - £88,350

Build a timber frame extension - £26,234

Build a swimming pool - £81,234

Single storey extension - £59,672

Side return extension - £44,128

Install an RSJ - £2,434

Outbuilding - £10,234

Build a Mansard loft conversion - £52,234

Loft conversion - £35,940

Build a kitchen extension - £42,234

Hip to gable loft conversion - £42,234

Granny annexe - £87,234

Garden office - £10,234

Convert a Garage - £16,234

Garage - £18,734

Build a flat roof extension - £22,234

Build a dormer loft conversion - £42,234

Concrete foundations - £6,484

Convert a bungalow loft - £29,234

Convert a basement - £40,128