Building estimate for ductwork
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A large 72"x30" duct may take 3 times as long to fabricate as small 12"x12" duct. The size of the ductwork or other sheet metal item is a major factor.Some of the major factors involved in fabrication and installation of sheet metal are: Understanding the principles and characteristics that cause labor to vary is vital to the accurate establishment of man-hours. The approach of using man-hours for estimating ductwork labor is compatible for both estimating by the piece and by the pound. The same 300 man hours after a wage increase to $50 is $15,000 For example, 300 man hours times $45 per hour results in $13,500 in labor costs.
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Once the constant man-hours of labor have been estimated on a bidding project, the total hours are simply multiplied times whatever the correct wage rate is at that time for that location. They can apply to different areas of the country they can be used for different union and non-union rates, for increases in wage rates, and for adjustments in inflation. Labor hours don't change as wage rates do. Man-hours remain the same over time, given similar conditions, and they don't have to be reworked over and over again for variations in wage rates. Unit labor and productivity rates can be better developed with man-hours. Labor hours are a constant and they are easier to work with, as opposed to dollar costs, which can vary. Using man-hours can be a more realistic measurement of labor, and can lead to more accuracy.