Khalid Osman
We agree on the work, price and appointment before starting. Our approach focuses on clear communication, punctuality, careful workmanship and leav...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Relax... you have found a reliable extension builder in Kensington. M & A UK Ltd is a friendly and reliable company based in Kensington who conside...
Need to find an Extension Builder near you for all your extension buildering work?
AJ Wells provides a local, trusted extension buildering ...
Jonathan Rimmer
Experienced extension builder ready to quote for your work. Mr is the best extension builder in Kensington. No obligation free quotes and many happ...
Newpark Construction are here to help customers who need an Extension Builder in Kensington. We offer a competitive rate to complete all your exten...
Jay Reid
London Construction is an established and experienced local extension builder in Kensington. Please contact us for a free, no obligation quote and ...
A to Z Builders Ltd are here to help customers who need an Extension Builder in Kensington. We offer a competitive rate to complete all your extens...
JK Doors is a trusted extension builder serving customers in Kensington and the surrounding area. Contact us to today to get a competitive quote fo...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Kensington it ranges from £2,128 (BPS Building based in NW6) to £4,520 (Reid and Co Developments Ltd based in NW8).
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 Kensington by posting a job with HaMuch and we will send it to extension builders in Kensington.
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 - £17,878

Two storey extension - £88,566

Build a timber frame extension - £26,378

Build a swimming pool - £81,378

Single storey extension - £62,552

Side return extension - £45,748

Install an RSJ - £2,578

Outbuilding - £10,378

Build a Mansard loft conversion - £52,378

Loft conversion - £37,290

Build a kitchen extension - £42,378

Hip to gable loft conversion - £42,378

Granny annexe - £87,378

Garden office - £10,378

Convert a Garage - £16,378

Garage - £18,878

Build a flat roof extension - £22,378

Build a dormer loft conversion - £42,378

Concrete foundations - £6,628

Convert a bungalow loft - £29,378

Convert a basement - £41,748