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Bspec Ltd
Mick Singh
At Building Services Contractors we pride ourselves on an efficient and friendly service, and strive to achieve 100% customer satisfaction.
SH Enterprise
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
SLS BUILDERS LIMITED
SLS BUILDERS LIMITED is a trusted extension builder serving customers in Highbury and the surrounding area. Contact us to today to get a competitiv...
Torrington
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
Five Star Builder
Experienced extension builder ready to quote for your work. Five Star Builder is the best extension builder in Highbury. No obligation free quotes ...
London Trowel Co.
Relax... you have found a reliable extension builder in Highbury. London Trowel Co. is a friendly and reliable company based in Highbury who consid...
Thermodynamic Building Services Ltd
Trusted and professional extension builder in Highbury. Experienced in all extension buildering work and keeping within budget and on quote. Thermo...
First guard Roofing
Darren Bergin
Relax... you have found a reliable extension builder in Highbury. First guard Roofing is a friendly and reliable company based in Highbury who cons...
CK Constructions & Development Ltd
CK Constructions & Development Ltd is a trusted extension builder serving customers in Highbury and the surrounding area. Contact us to today to ge...
GS Fabric Ltd
GS Fabric Ltd is an established and experienced local extension builder in Highbury. Please contact us for a free, no obligation quote and competit...
RSJ cost in Highbury
How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Highbury it ranges from £2,128 (GS Fabric Ltd based in E2) to £2,600 (Five Star Builder based in N16).
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 Highbury by posting a job with HaMuch and we will send it to extension builders in Highbury.
"RSJ re-installation" - N16, job posted 04/10/25
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Estimates for common extension builder jobs in Highbury;
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 - £17,673
Two storey extension - £88,259
Build a timber frame extension - £26,173
Build a swimming pool - £81,173
Single storey extension - £58,456
Side return extension - £43,444
Install an RSJ - £2,373
Outbuilding - £10,173
Build a Mansard loft conversion - £52,173
Loft conversion - £35,370
Build a kitchen extension - £42,173
Hip to gable loft conversion - £42,173
Granny annexe - £87,173
Garden office - £10,173
Convert a Garage - £16,173
Garage - £18,673
Build a flat roof extension - £22,173
Build a dormer loft conversion - £42,173
Concrete foundations - £6,423
Convert a bungalow loft - £29,173
Convert a basement - £39,444