Count your missed calls for one week before you decide anything
Most trade business owners can tell you their fuel bill to the euro and have no idea how many calls their office phone loses in a week. The number decides whether an SMS auto-reply, call forwarding or an AI receptionist is the right fix, and it takes one week and a notepad to get. This article walks through the audit, what to strip out of the count, how to put a value on what is left, and which fix fits which result.
A window and door fitter with eight staff runs its office from a converted garage. The owner's partner does the phones on Monday, Wednesday and Friday mornings. The rest of the week the landline rings into a voicemail box that was last emptied in spring. Asked how many calls the firm misses, the owner says "a few, maybe". Asked how many quotes it sent last month, the owner has the number instantly, because quotes live in the software and missed calls live nowhere.
That gap in knowledge is the problem. Every decision about the phone, from a cheap auto-reply to a full AI receptionist, depends on a number that almost nobody has. The good news is that the number takes one week to collect and costs nothing.
Why you cannot guess it
Two data sets give a rough range for how many calls trade businesses lose, and both come from the US. Invoca, a call-tracking provider, sees around 26 percent of calls to home-services businesses going unanswered in its data. 411 Locals ran a test in 2024, phoning 85 businesses across 58 industries, and 62 percent of those calls went unanswered. The second figure comes from a small sample and swings a lot by industry, so treat the home-services number as the floor and the test as the ceiling.
A quarter to almost two thirds is too wide a range to plan around. Your own firm sits somewhere inside it, and where it sits depends on things no study can know: whether someone is in the office at lunch, whether the mobile forwarding works in the workshop, whether Saturday morning is quiet or the busiest hour of the week. So you count.
The one-week audit
Pick a normal week. Not the week after a trade fair, not the week the owner is on holiday. Then collect three things.
The missed-call log. Most office phone systems and every mobile show a list of calls that rang out, with time and number. Write them down each evening, or photograph the screen. If calls forward to a mobile, check that log too, and note which calls went to voicemail rather than being answered.
The voicemail box. Count the messages left. Then count the missed calls that left no message. That second number is the important one, because those callers are the ones who moved on to the next firm in the list.
The timestamps. For every missed call, note the hour. By Friday you will see a shape. In most trade firms the missed calls cluster at lunchtime, between five and seven in the evening, and on Saturday morning. Those are the hours when a homeowner has finally got round to calling and nobody is at the desk.
Strip out what is not a customer. Suppliers, sales calls, the bank, the number that rings every day at 9:04 and hangs up. Be honest about it; an owner who wants the number to be small will find reasons to discount half the list. What remains is people who wanted to buy something.
Turning the count into a number you can act on
You now have missed customer calls per week. Two more figures from your own books turn that into money.
The first is your quote conversion rate on first contact: of the people who phone about a job, how many end up as an order. Most owners know this to within ten points. The second is the average value of an order. Multiply the three together and you have the revenue that rang out per week. Multiply by 45 working weeks for the year. The calculator does this arithmetic with your own figures in two minutes, and it also lets you vary the conversion rate to see how sensitive the result is.
I deliberately give no example amount here, because it swings by an order of magnitude between trades. A window fitter with a four-figure average order and a cleaning contractor on monthly contracts get very different answers from the same number of missed calls.
What the sum leaves out is the second order. The homeowner who wanted new windows and reached voicemail calls someone else. That firm also gets the front door in two years and the recommendation to the neighbour. A missed first call is a missed customer, not a missed job.
Which fix fits which result
The count tells you which of three fixes to reach for. They are not exclusive, and most firms end up with two.
Under ten missed customer calls a week. An SMS auto-reply plus forwarding to a mobile will usually do. Anyone who rings and gets no answer receives a text within seconds: "Hello, this is Muster Windows. We are on site at the moment. What can we help with? We will get back to you shortly." Many phone systems and mobile apps can send this. The limits are that someone still has to read the replies and make the call back, and that landline callers get nothing. A single reply to a call attempt, without an offer in it, is not advertising under German unfair-competition law as I understand it; check with a lawyer if you are unsure.
Ten to thirty a week, clustered at lunch and after five. Forwarding on its own stops working here, because the person the calls forward to is on a ladder. The audit will show that a large share of your missed calls fall in two or three fixed windows. An AI receptionist that picks up after ten seconds during those windows, takes the enquiry and books a slot from the real calendar closes most of the gap without changing anything about how the office works the rest of the day.
Over thirty a week, or a business that trades on emergencies. At this volume the owner is the bottleneck, and every evening callback is half an hour taken from quoting or from family. The receptionist takes over first contact entirely, and the office only sees the calls that need a decision. Since 2 August 2026 an AI assistant on the phone must tell the caller in the first sentence that they are speaking to a machine, under Article 50 of the EU AI Act, with no exemption for small firms. In practice that sentence costs nothing and callers stay on the line more readily when they know what they are dealing with.
The AI receptionist page describes what the assistant says, what it hands to a person, and how it fits with the rest of the sequence. It is the fifth employee we install, not the first, because the employees before it deliberately produce more calls and this one is there to catch them.
What the window fitter found
The window fitter counted for one week in September. Twenty-three missed calls, of which four were suppliers and two were the same sales call. Seventeen customers. Eleven of the seventeen rang between 12 and 2 or after 5. Three left a voicemail. Fourteen did not.
The owner had the conversion rate and the average order to hand. The yearly figure was larger than the firm's entire marketing budget, and the fix for the lunchtime and evening windows cost less per month than one of those missed orders. The decision took less time than the count.
Do the count before you talk to anyone selling a solution, including us. It is the only number in this discussion that comes from your business rather than from a study, and it is the one that settles the argument.