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JK Doors is a trusted extension builder serving customers in Harley Street and the surrounding area. Contact us to today to get a competitive quote...
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
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
SLS BUILDERS LIMITED is a trusted extension builder serving customers in Harley Street and the surrounding area. Contact us to today to get a compe...
Relax... you have found a reliable extension builder in Harley Street. M & A UK Ltd is a friendly and reliable company based in Harley Street who c...
Darren Bergin
Relax... you have found a reliable extension builder in Harley Street. First guard Roofing is a friendly and reliable company based in Harley Stree...
CK Constructions & Development Ltd is a trusted extension builder serving customers in Harley 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 Harley Street. We offer a competitive rate to complete all your ext...
JM Building Services is a trusted extension builder serving customers in Harley Street and the surrounding area. Contact us to today to get a compe...
Hussein Eljhani
We are highly professional Builders Company, hones pricing and reliable, we leave all areas clean and tidy.

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Harley Street it ranges from £2,128 (BPS Building based in NW6) to £2,840 (ELJHANI BUILDING & PROPERTY MANAGEMENT SERVICES LTD based in NE4).
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 Harley Street by posting a job with HaMuch and we will send it to extension builders in Harley 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 - £17,666

Two storey extension - £88,248

Build a timber frame extension - £26,166

Build a swimming pool - £81,166

Single storey extension - £58,312

Side return extension - £43,363

Install an RSJ - £2,366

Outbuilding - £10,166

Build a Mansard loft conversion - £52,166

Loft conversion - £35,303

Build a kitchen extension - £42,166

Hip to gable loft conversion - £42,166

Granny annexe - £87,166

Garden office - £10,166

Convert a Garage - £16,166

Garage - £18,666

Build a flat roof extension - £22,166

Build a dormer loft conversion - £42,166

Concrete foundations - £6,416

Convert a bungalow loft - £29,166

Convert a basement - £39,363