Khalid Osman
We agree on the work, price and appointment before starting. Our approach focuses on clear communication, punctuality, careful workmanship and leav...
Relax... you have found a reliable extension builder in Guildhall. London Trowel Co. is a friendly and reliable company based in Guildhall who cons...
Trusted and professional extension builder in Guildhall. Experienced in all extension buildering work and keeping within budget and on quote. Therm...
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
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
Darren Bergin
Relax... you have found a reliable extension builder in Guildhall. First guard Roofing is a friendly and reliable company based in Guildhall who co...
CK Constructions & Development Ltd is a trusted extension builder serving customers in Guildhall and the surrounding area. Contact us to today to g...
A to Z Builders Ltd are here to help customers who need an Extension Builder in Guildhall. We offer a competitive rate to complete all your extensi...
Experienced extension builder ready to quote for your work. Cornerstones Construction is the best extension builder in Guildhall. No obligation fre...
JK Doors is a trusted extension builder serving customers in Guildhall and the surrounding area. Contact us to today to get a competitive quote for...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Guildhall it ranges from £2,176 (A to Z Builders Ltd based in SW1P) to £2,576 (CK Constructions & Development Ltd based in WC1N).
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 Guildhall by posting a job with HaMuch and we will send it to extension builders in Guildhall.
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 - £17,643

Two storey extension - £88,215

Build a timber frame extension - £26,143

Build a swimming pool - £81,143

Single storey extension - £57,864

Side return extension - £43,111

Install an RSJ - £2,343

Outbuilding - £10,143

Build a Mansard loft conversion - £52,143

Loft conversion - £35,093

Build a kitchen extension - £42,143

Hip to gable loft conversion - £42,143

Granny annexe - £87,143

Garden office - £10,143

Convert a Garage - £16,143

Garage - £18,643

Build a flat roof extension - £22,143

Build a dormer loft conversion - £42,143

Concrete foundations - £6,393

Convert a bungalow loft - £29,143

Convert a basement - £39,111