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Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
SLS BUILDERS LIMITED is a trusted extension builder serving customers in Oxford Street and the surrounding area. Contact us to today to get a compe...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Torrington Design
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
Relax... you have found a reliable extension builder in Oxford Street. M & A UK Ltd is a friendly and reliable company based in Oxford Street who c...
Jay Reid
Darren Bergin
Relax... you have found a reliable extension builder in Oxford Street. First guard Roofing is a friendly and reliable company based in Oxford Stree...
Experienced extension builder ready to quote for your work. D & G Building & Decorating is the best extension builder in Oxford Street. No obligati...
CK Constructions & Development Ltd is a trusted extension builder serving customers in Oxford Street and the surrounding area. Contact us to today ...
A to Z Builders Ltd are here to help customers who need an Extension Builder in Oxford Street. 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 Oxford Street 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 Oxford Street by posting a job with HaMuch and we will send it to extension builders in Oxford Street.
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 - £17,866

Two storey extension - £88,548

Build a timber frame extension - £26,366

Build a swimming pool - £81,366

Single storey extension - £62,312

Side return extension - £45,613

Install an RSJ - £2,566

Outbuilding - £10,366

Build a Mansard loft conversion - £52,366

Loft conversion - £37,178

Build a kitchen extension - £42,366

Hip to gable loft conversion - £42,366

Granny annexe - £87,366

Garden office - £10,366

Convert a Garage - £16,366

Garage - £18,866

Build a flat roof extension - £22,366

Build a dormer loft conversion - £42,366

Concrete foundations - £6,616

Convert a bungalow loft - £29,366

Convert a basement - £41,613