The number varies by call volume and average project value but the math follows the same pattern across every contracting trade. If a contractor misses 15 to 20 calls per month and 80% of those callers do not call back, and the average project is worth $2,000 or more, the monthly revenue exposure is typically $4,000 to $15,000 or higher. For contractors with large average tickets like roofing or restoration the number climbs significantly faster.