You already know your average invoiced ticket — not the quoted range, the invoiced average, which is the only one that matters. Write it down.
Now the number almost nobody has: how many calls went unanswered last month. Your phone system knows even if you do not, and the answer is usually worse than the guess, because a missed call does not feel like anything. There is no moment where a job visibly walks out of the door. There is only a voicemail light and a week that felt busy.
Multiply those two, then be brutal with it. Assume most of those callers were price shoppers, wrong trade, or never going to book. Halve what is left. Halve it again if you are feeling pessimistic. Whatever survives that is a real number, and for most plumbing companies it is larger than every marketing line item on the books combined — because it is not spend, it is spend that already happened and produced nothing.
There is a second layer that a veteran will price and a spreadsheet will not. The 2am emergency is not one job. A homeowner who has had a plumber turn up at 2am on a holiday weekend does not shop the next time, does not shop for the water heater, and gives your name to their neighbour. Emergency work is how residential plumbing companies buy customers, and it is bought at the moment somebody answers a phone.
Set that against what answering costs. Megan is billed by the second she is actually talking, so a quiet month costs almost nothing and a freeze week costs more because a freeze week earned more. There is no seat to fund whether it rings or not, which is precisely the arithmetic that makes round-the-clock coverage possible for a company with three trucks rather than thirty.
It is worth knowing what the research on response speed actually shows, and being careful about it. Harvard Business Review's audit of 2,241 U.S. companies found that 23% never responded to an inbound enquiry at all, and that among those that did respond within 30 days the average took 42 hours. In a separate study of 1.25 million leads, firms that made contact within an hour were nearly seven times as likely to have a meaningful conversation with a decision maker as those that waited just one hour longer. That research is about web enquiries and outbound follow-up, not about answering a ringing phone, and it is not specific to plumbing — so treat it as evidence that speed decides outcomes generally, not as a claim about your trade. In plumbing the window is tighter than an hour, not looser.
Pay As You Go is $29 a month plus $0.88 for each minute Megan spends on calls, with no included minutes. Professional is $199 a month and includes 500 minutes, then $0.45 a minute. Growth is $499 a month and includes 1,500 minutes, then $0.38 a minute. Enterprise is priced by conversation. Every plan includes the entire product — the plans differ by included minutes only — and calls are billed in real seconds, never rounded up to the next minute.