celtic said:
I would charge $0.00 per sq. ft ....I also would not bid a job on a sq.ft basis.
If the extras are discussed and finalized before we start, the price(per item)is the same as if the items were on the original estimate.
If the extras come after we've started....the price can only go up ~ nothing like adding an outlet onto an already tiled backsplash to give the customer some heart failure.
Square ft pricing not for electrical, when have you last purchased a square foot of cable, or a sq ft of any electrical device, or when have you ran cables by the square foot?
GC's are use to dealing with sg ft prices for material that is purchased and installed by the square, for example roofing material.
Electrical wiring, is a planned run, of cables, and devices, each run being different in circuit size, and layout.
Back somewhere is the 50's when production housing became popular, developers would plan a home wiring job then give it a Sq Ft value, they controlled every area of the project, which gave them price control.
The practice continued thru the years, into large projects, like condo's and townhouses, they were planned and priced by developers and given a sq ft value, over the years, they trainned contractors to accept the value prices, and the low end bidders accepted this practice for years, I your intent is to earn a modest profit on the jobs then a custom pricing system would be a better plan. Price by the piece, and assemble the project.