There are two failure modes and one of them is far more common. A small number of businesses over-message, sending promotions monthly until people tune out. The large majority do the opposite: they do excellent work, say nothing for two years, and are then surprised when the customer uses somebody else.
The second failure is more expensive, because it loses customers you already earned.
The useful test, which is not a frequency
Before asking how often, ask what the message does for the recipient. A reminder that their service is due is useful. A note that you will be in their area is useful. A newsletter about your company anniversary is not.
Useful messages can be sent considerably more often than promotional ones without irritating anyone, which is why frequency guidance in the abstract is not much help. Five useful messages a year beats two promotional ones.
A cadence that works for most service businesses
| Moment | Message | Channel |
|---|---|---|
| Immediately after enquiry | Acknowledgement, naming the job | Text |
| Day before appointment | Reminder with arrival window | Text |
| On the way | Technician en route | Text |
| Day after completion | Check everything is right, ask for a review | Text or email |
| Service interval minus 3 weeks | Due for next service | Email, then text if no reply |
| Seasonal, twice a year | Something genuinely relevant to the season | |
| 12 months quiet | Personal, low-key re-engagement | Text or call |
That is roughly five to seven touches a year for an active customer, almost all of them tied to something specific. Very few people object to any of it, because each message has an obvious reason to exist.
The eighteen-month gap
The most damaging pattern in service businesses is the long silence. A customer who has not heard from you in eighteen months has, functionally, no relationship with you. When their need returns they search rather than remember, and you compete for them again as though they were new.
The fix is a re-engagement trigger rather than a campaign: when a customer crosses twelve months with no contact, someone reaches out. Not a promotion — a short, human message. Conversion on those is consistently higher than on cold acquisition and it costs nothing.
What to actually send
Frequency is the easy half. The reason most between-job contact fails is that it has nothing to say, so it defaults to a discount, and a discount is a message that the relationship is transactional.
| Moment | What to send | Why it lands |
|---|---|---|
| After the job | What was done, what to watch for | It is about their property, not your business |
| Seasonal, ahead of risk | What is coming and what it means for them | Useful before it is needed, not after |
| Service due | A specific date and a one-tap booking | Removes the effort of deciding when |
| Annual | A summary of the year and what is ahead | Makes invisible work visible |
Nothing on that list is a promotion, and all of it earns the right to send the occasional one.
Segment by relationship, not by list
The single biggest improvement most service businesses can make is to stop sending everything to everyone. A customer on a maintenance plan and a customer from one emergency call three years ago are in completely different relationships, and identical messaging is wrong for at least one of them.
- Active plan customers hear from you naturally through the service rhythm. Extra marketing on top reads as noise.
- Recent one-off customers are the group worth working. They already trust you and have no reason to think of you again.
- Dormant customers need a reason to reappear, and it is usually a service interval rather than an offer.
- Customers who declined a quote are a separate list entirely, and the right cadence there is measured against the job, not the calendar.
The signals your frequency is wrong
- Rising unsubscribes or opt-outs. Too frequent, or not relevant enough.
- Falling open rates over months. The content stopped being useful before the frequency became a problem.
- Customers surprised you are still trading. Far too infrequent.
- Repeat customers arriving through paid search. You are paying to reacquire people you already had.
That last one is worth checking specifically, because it is invisible unless you look. Paying for a click from an existing customer is the clearest possible evidence that the cadence has a gap in it.
Common questions
How often should I email my customer list?
For most service businesses, four to six times a year of genuinely useful content, plus transactional messages tied to their jobs. Frequency matters less than whether each message has a specific reason to exist.
Is it better to text or email customers?
Text for anything time-sensitive or logistical — reminders, arrival, confirmations. Email for anything longer or seasonal. Response rates on text are far higher, which is exactly why it should be reserved for messages that warrant it.
What should I send between jobs?
Service reminders, seasonal advice relevant to their equipment or property, and occasional check-ins. Company news is rarely interesting to customers and is the most common filler.
How do I win back a customer who has gone quiet?
A short, personal message referencing the last work you did, sent by text rather than as part of a campaign. Re-engagement converts better than cold acquisition and costs nothing, provided you know who has gone quiet.