From £2,536
Luxury Movement is an established extension buildering business in Sloane Square. We come highly recommended and provide competitive quotes for you...
From £2,224
At Alt Construction we provide a complete and professional turnkey construction service for internal alterations, extensions, including detailed de...
From £2,592
Trusted and professional extension builder in Sloane Square. Experienced in all extension buildering work and keeping within budget and on quote. P...
From £2,096
Trusted and professional extension builder in Sloane Square. Experienced in all extension buildering work and keeping within budget and on quote. S...
From £2,608
Our building services company Autas Developments have fifteen years' experience of helping customers in Central London and the surrounding areas by...
From £2,536
Knightsbridge Design was founded by a group consisting of some of the most exceptional and talented decorators in London. Our mission is to provide...
From £408
Here at London Design and Build, our team of architects, interior designers, structural engineers and contractors, offer a bespoke, turn-key servic...
From £2,520
Cliden Construction (London) is a trusted extension builder serving customers in Sloane Square and the surrounding area. Contact us to today to get...
From £2,456
F & F Building Services is an established extension buildering business in Sloane Square. We come highly recommended and provide competitive quotes...
From £2,176
A to Z Builders Ltd are here to help customers who need an Extension Builder in Sloane Square. We offer a competitive rate to complete all your ext...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Sloane Square it ranges from £408 (London Design And Build based in SW1A) to £2,608 (Autas Developments based in SW1W).
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 Sloane Square by posting a job with HaMuch and we will send it to extension builders in Sloane Square.
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 - £17,515

Two storey extension - £88,023

Build a timber frame extension - £26,015

Build a swimming pool - £81,015

Single storey extension - £55,304

Side return extension - £41,671

Install an RSJ - £2,215

Outbuilding - £10,015

Build a Mansard loft conversion - £52,015

Loft conversion - £33,893

Build a kitchen extension - £42,015

Hip to gable loft conversion - £42,015

Granny annexe - £87,015

Garden office - £10,015

Convert a Garage - £16,015

Garage - £18,515

Build a flat roof extension - £22,015

Build a dormer loft conversion - £42,015

Concrete foundations - £6,265

Convert a bungalow loft - £29,015

Convert a basement - £37,671