A class I took at the World of Concrete discussed this "Head Ache" factor in detail. The guide lines they drew, were to add between 2-5% of the job cost, plus additional material, to compensate for your efforts in conforming to your client's indecisions and preferences. My company is fortunate in that we have mainly a singular construction focus, and can track our performances on an averages basis monthly. Depending on total square footage of the projects scheduled; combined with an assigned level of difficulty factor, we typically classify our work into three categories: 1. residential and patch. 2. Light commercial or under 80 cubic yards. 3. Large industrial or volume discountable. This all together determines how much square footage we should be achieving per laborer, per day. The last Friday of the month meeting is take out the trash, or take 'em out to dinner day.
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Tim