The study
Over Q4 2025 and Q1 2026, we ran an A/B framework across 412 consenting Servicio tenants and 78,400 homeowner relationships. The hypothesis: some notifications drive retention, some are noise, and we did not actually know the ranking. We split tenants into cohorts where specific notification types were enabled or disabled, held everything else constant, and measured 90-day retention and NPS.
The winner, by a wide margin
The "on the way" SMS — the one the tech fires when they leave the previous stop, typically 15–25 minutes before arrival — drove more measurable retention than any other homeowner-facing notification we ship.
Cohorts with "on the way" SMS enabled had 91-day retention of 94.2%, vs. 87.1% in cohorts without. That is a 7.1 point swing on a metric where every single point shows up in trailing MRR. NPS moved from 38 to 61 — not a delta any other notification came close to touching.
Why this one, specifically
Because the homeowner's #1 anxiety about a service visit is not "did they do a good job." It is "is someone going to show up when I was told they would show up." The reason that anxiety exists is that most service companies are structurally unable to answer it. You do not know where your tech is right now; the tech does not know if they are behind; the homeowner has no way to find out.
An "on the way" SMS, sent by the tech tapping a button when they leave the previous stop, collapses that entire anxiety in one sentence. The homeowner sees a text. They know what's happening. They no longer need to check in. The service experience is transformed before the service even starts.
The notifications that did almost nothing
- "Visit scheduled" (sent 24 hours before the visit): +0.2 point retention. Inside the margin of error. Homeowners have calendars.
- "Visit completed" email without photos: +0.6 point. Barely measurable. It feels like a transactional confirmation, not a service moment.
- "Visit completed" email with before/after photos: +2.8 point. This was our second-best retention notification. The photos transform the email from a receipt into a service artifact.
- Quarterly newsletter: −0.1 point. A wash. Open rates around 14%. Do not send one unless you have something specific to say.
The practical takeaway
If you are launching a field service company today and can only ship three notifications, ship these three, in this order: "on the way" SMS, "visit completed" email with photos, "invoice sent" email with a pay link. Every other notification is polish. These three are the product.