The phone rings at 2 a.m. in January. A voice says the house is cold. Is that an emergency?
It depends. A gas furnace that stopped, in a house with a newborn and a forecast of 5 degrees, is an urgent dispatch. A heat pump that is blowing lukewarm air in a 55 degree house with a working space heater can often wait for the 7 a.m. slot. Whoever answers has to tell the two apart in about 90 seconds, and has to be right about the ones that threaten safety.
That is triage, and it matters whether the one answering is a dispatcher on call, an answering service or an AI agent. This post is a framework for writing the rules. For the wider question of capturing leads after hours, see after-hours lead capture for contractors, which owns that topic. This one covers how to sort the calls that come in.
If you want to price the calls you lose before deciding how much coverage to buy, start with what a missed call really costs a contractor.
Why triage rules come first
Without written rules, every call is judged by whoever happens to answer. One person sends a tech out for every "no AC" call and burns overtime on a non-urgent job. Another puts a flooding basement into the morning queue. Both errors are expensive, and the second one can be dangerous or lead to a lawsuit.
Writing the rules also makes a handoff to an AI agent or an answering service possible. You cannot tell a tool to "use good judgment." You can tell it: if the caller mentions X, do Y.
We looked for a neutral, sourced figure for what share of after-hours calls are true emergencies. We did not find one we could verify, and the numbers published by individual vendors come from their own call data without a method you can check. So we are not quoting a percentage. Pull your own: sort last month's after-hours calls into the three tiers below and count them. That number, not an industry average, should drive your staffing.
A three-tier model
Tier 1: Safety emergencies. Always a human, always immediately.
These are calls where someone could be hurt or the house is at risk right now. Examples:
- Gas smell. PHMSA, the federal pipeline safety agency, advises people who suspect a gas leak to leave the area and call 911 from a location away from the leak, not to use a phone or cell phone, and not to operate light switches or create any spark. The first instruction your triage script gives a caller who smells gas is to leave and call 911. Booking comes after.
- Carbon monoxide alarm sounding or symptoms. The Consumer Product Safety Commission says that if you suspect carbon monoxide poisoning, you should get outside to fresh air immediately and call 911. Same rule: safety instruction first, service call second.
- Active flooding, a burst pipe or water near electrical equipment. The caller needs to be told how to find and close the main shutoff if it is safe, and a plumber needs to be dispatched.
- Electrical burning smell, sparking or smoke from equipment.
The rule for this tier: no AI-only handling, no message-taking, and no "we will call you in the morning." The script gives the safety instruction, then connects to the on-call person or escalates through a defined chain. If the first person does not pick up, the chain continues. Test it.
Tier 2: Urgent, no safety risk. Same-night or first-slot dispatch.
The loss of service is real, but nobody is in danger. Examples:
- No heat in winter, with the household's circumstances considered: elderly, infants, medical needs, outdoor temperature.
- No cooling in a heat wave, again with vulnerable occupants considered.
- A water heater that has failed, a sewer backup or a toilet that is the only one in the house.
- A leak that is contained once the caller closes a shutoff.
This tier is a judgment call, so give the answerer questions that decide it: Who is in the home? What is the temperature? Can the problem be contained right now? The answers decide between waking a tech and booking the first slot.
Tier 3: Routine. Book it, do not dispatch it.
Maintenance requests, quotes, a slow drain, a tune-up, a noisy blower, a thermostat that needs replacing, a question about a past invoice. This is the tier an AI agent or answering layer can handle fully by booking the next available slot. It also covers the routine calls that sound urgent but are not, such as "I need this fixed ASAP" about a cosmetic or minor issue.
What to ask, in order
A simple script works on a person or a machine:
- Safety first. Do you smell gas? Does a carbon monoxide alarm sound? Is water near electrical outlets or the breaker panel? Any yes goes to Tier 1.
- What stopped, and since when?
- Who is in the home? Infants, older adults, anyone medically dependent on heat, cooling or water.
- Can you contain it? Can the caller shut off the water or switch off the unit?
- Address, name and the best number to reach them.
Capture the contact details even for emergencies so that if the line drops, someone can call back.
Set the dispatch rules separately
Triage tells you which tier the call falls in. Your business then decides what each tier triggers. Write down:
- Who is on call, and the backup if they do not answer.
- Which tier gets a callout fee or after-hours rate, and how that is disclosed before dispatch.
- Service area limits. An address outside your area should be told at the start, not after a tech is awake.
- Seasonal changes. The same no-cooling call is more urgent in a heat wave than in May.
Keep a log, then revise the rules
Your first set of rules will be wrong in a few places. For the first 60 days, log every after-hours call: the tier it was assigned, what was dispatched, and what the tech found on arrival. Two patterns are worth looking for. Calls tiered urgent that turned out routine tell you where you can safely relax. Calls tiered routine that turned out urgent tell you where to tighten. Adjust the questions, not just the labels.
Review the log weekly with whoever is on call. That keeps the rules tied to what actually happens on your jobs, in your climate, with your customers.
Handing triage to an AI agent
An AI receptionist can handle Tier 3 and the information-gathering for Tiers 1 and 2. The risk sits in the edges: a caller who describes a gas smell indirectly, one who is panicking, or one whose accent or poor connection confuses the system. Before trusting it, test with recorded scripts for each tier, including awkward phrasing. Our buyer's guide to AI receptionists for contractors has a test list, and the trade-specific posts cover HVAC and plumbing call tests.
The safe design is simple: when in doubt, escalate. An agent that sends too many calls to a human costs you some sleep. An agent that sends a gas leak to the morning queue costs far more.
If you want triage rules written, tested and connected to your scheduling software, that is the after-hours AI qualification part of our Booked-Jobs Recovery System, described on our AI customer support page. This post is general information about call handling, not legal or safety advice. Confirm your emergency protocols with your insurer and counsel.