Guide
First, put a real number on what a no-show costs your business. Then use the three-touch reminder cadence below, and know which touch is doing the actual work.
Before you spend money on reminder software, know what you're solving for. Most owner-operators guess the cost of a no-show is "the missed job value". It's not. It's the missed job value, minus what you'd have earned instead, plus the fixed costs you still paid.
Use this formula:
Cost per no-show = Lost revenue − Salvage value + Wasted fixed cost
Say a plumber charges £180 for an average callout, pays a technician £18/hour, and the round trip plus wasted slot eats 1.5 hours. Fuel and vehicle cost for the trip is roughly £12.
| Item | Amount |
|---|---|
| Lost revenue (missed job) | £180 |
| Salvage value (nothing else booked) | £0 |
| Technician wage for wasted 1.5 hrs | £27 |
| Fuel/vehicle cost | £12 |
| Total cost per no-show | £219 |
Run that across a typical month. If this business sees 6 no-shows out of 80 bookings (a 7.5% rate, which is fairly normal for unscreened callouts), that's £1,314 a month walking out the door. Over a year, £15,768. That's the number that should decide your reminder budget, not a gut feeling.
Do this same sum with your own prices and drive times. It usually lands somewhere between £80 and £300 per no-show for trades work, and higher again for jobs with specialist parts already ordered.
A single text the night before catches people who forgot. It doesn't catch people who never really committed, people who double-booked themselves, or people whose plans changed on the day. Different failure modes need different touches, spaced to catch each one before it turns into an empty slot.
The three-touch cadence below is built around when people actually cancel, not when it's convenient for you to send a message.
Send this roughly two days out. Its job isn't to remind, it's to surface cancellations early enough that you can refill the slot. Ask for a simple reply or a one-tap confirm link.
Example wording: "Hi [name], confirming your plumbing appointment Thursday 10am–12pm with [business]. Reply YES to confirm or call [number] to reschedule."
This is the touch that gives you runway. A cancellation at 48 hours can often be refilled from a waitlist or a quieter day. A cancellation at 2 hours almost never can.
This is the reminder doing most of the heavy lifting. Most no-show reduction studies and platform data from booking tools consistently point to the 24-hour message as the single biggest lever, because it lands when the appointment is close enough to be salient but early enough that people haven't already made a conflicting plan.
If you can only afford to build one automated message, build this one. Keep it short and give a clear action: "See you tomorrow at 10am for your boiler service. Reply RESCHEDULE if that no longer works."
The 48-hour touch catches people who've forgotten entirely; the 24-hour touch catches the much larger group who are still deciding whether to bother.
This message won't rescue a cancellation, but it does two useful things. It nudges someone who's genuinely forgotten, and it gives you legitimate warning to redirect a technician who's already en route, rather than finding out at the doorstep.
Keep it functional: "Your technician [name] is on the way, arriving around 2pm." No question, no reply needed. This isn't a persuasion touch, it's an operations touch.
| Touch | Main job | Impact on no-show rate |
|---|---|---|
| 48 hours | Surface cancellations early enough to refill | Moderate, but valuable for rebooking |
| 24 hours | Prevent no-shows before day-of plans form | Highest single impact |
| 2 hours | Reduce wasted drive time, catch true forgetfulness | Small, mostly operational |
If you're setting this up manually with a calendar and a phone, do the 24-hour text without fail and add the other two once that's routine.
Text messages get read within minutes for most people; email reminders sit unread for hours or get filtered. If your booking software supports SMS reminders, use them for the 24-hour and 2-hour touches even if email is cheaper. The marginal cost of an SMS (typically a few pence) is trivial next to the £80–£300 cost of the no-show it prevents.
A reminder system reduces forgetfulness. It doesn't fix customers who never intended to show. If someone no-shows twice, that's a policy problem, not a reminder problem. Options worth considering, subject to what your terms of service actually say and confirming with your accountant on how deposits are treated for tax purposes:
These sit downstream of the reminder cadence. Fix the forgetfulness first with the 48/24/2 system, then handle the small number of people the reminders can't reach.
Measure your no-show rate monthly: no-shows divided by total bookings. Compare the month before you added reminders with the month after. A reasonable expectation is a meaningful drop, often cutting the rate by roughly a third to a half, though the exact figure depends on your customer base, job type, and how far ahead people book. Track it against the cost-per-no-show number you worked out at the start, so you can see the pound value of the improvement, not just a percentage.
The Small Business Operations Kit ($19) turns guides like this one into fill-in-once worksheets: rate card, quoting sheet, job costing, payment terms and follow-up templates.