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An average commercial steel building costs between $16 and $20 per square foot, including building package (I-Beams, purlins, girts etc.) , delivery, foundation and the cost of construction.

To find out which utility company currently supplies a property with gas or electric, you can call the Meter Number Helpline and provide your gas meter number to find out who your gas supplier is.

It was not until 1880 that an era of construction based on reliable mild steel began. By that date the quality of steels being produced had become reasonably consistent. The Home Insurance Building, completed in 1885, was the first to use skeleton frame construction, relying on its masonry cladding for stability.

Ideally, the switch should take no longer than 17 days from the date you arranged to change supplier. This allows for a 14 day "cooling off period" where you can change your mind about switching. This comes after energy regulator Ofgem challenged gas and electricity companies to cut their switching times.

Wrought iron was actually "wrought" (i.e. worked or hammered) into bars and has been used as a construction material for thousands of years. Most metals used for construction purposes are alloys. For example, steel is an alloy with iron and carbon being the primary elements.