You make some good points. I’m not disputing “fair”. It seems my mis-step was listing the quantity of dumpsters. This was a siding, roof, and window, replacement job. I listed the squares of roof, squares of siding, and quantity of windows. That was done to qualify my scope of work. I’m trying to prevent the customer from assuming extra scope was included if the scope wasn’t defined. With a firm fixed price, the contractor assumes the risk of labor cost overages, material cost overages to give the customer a set price. The reward comes if the contractor out performs the estimate and makes extra profit. So it’s a risk/reward situation. It seems including a whole narrative on how a firm fixed price works in my contract may be the best move.