ROI calculations for software tools are usually optimistic. This one doesn't need to be. The math for an AI receptionist is straightforward enough that even a conservative estimate produces a strong number.
Contractors using Dolfyn report recovering an average of $3,400 in their first month from calls that previously went unanswered. At $179/month, that's a first-month return of roughly 19x. Whether your number is higher or lower depends on your call volume, average job value, and how many calls you're currently missing. Those three inputs determine everything.
Dolfyn clients recover an average of $3,400 in their first month. Contractors miss 27-74% of inbound calls on job sites. The ROI formula: (missed calls per week x job value x conversion rate x 52) minus annual AI cost. For a plumber missing 8 calls per week at $425 average job and 38% conversion, annual recovered revenue is $67,184 against $2,148 annual AI cost. Payback period for most contractors: under one week.
Three numbers drive the calculation. Your weekly missed call volume, your average job value, and your conversion rate on answered calls. If you don't know your exact miss rate, use 30% as a conservative starting point — Housecall Pro data puts the average home service miss rate at 27%, and NextPhone's contractor-specific study found 74%.
That's a conservative model. It assumes only 80% of missed calls get recovered by the AI — the other 20% may have been spam, wrong numbers, or callers who wouldn't have converted regardless. It uses a 38% conversion rate which is mid-range for plumbing. And it uses $425 as a job value, which is the average across service calls and doesn't account for larger jobs.
| Trade | Avg Job Value | Miss Rate | Est. Weekly Recovery (10 calls) | Annual Recovery |
|---|---|---|---|---|
| Plumbing | $425 | 28% | $1,190 | $61,880 |
| HVAC | $350 | 25-35% | $980 | $50,960 |
| Electrical | $380 | 28% | $1,064 | $55,328 |
| Roofing | $1,200 | 20% | $3,360 | $174,720 |
| General Contracting | $2,500 | 30% | $7,000 | $364,000 |
| Pest Control | $200 | 25% | $560 | $29,120 |
Roofing and general contracting numbers look extreme but reflect the reality of high job values combined with significant miss rates. A roofer who recovers three additional jobs per month from previously missed calls at $1,200 average value is generating $43,200 per year in recovered revenue against $2,148 in annual AI cost.
The calculation above covers calls missed during business hours. After-hours is a separate pool. Research shows roughly 40% of service business bookings happen outside regular hours. For most contractors, those calls go entirely to voicemail today.
If your business gets 35 calls per week and 40% come after hours, that's 14 calls per week that currently hit voicemail with near-zero recovery rate. Adding those to the ROI calculation more than doubles the number. The after-hours window is where the ROI of an AI receptionist is clearest, because the baseline it's competing against is zero.
Two things move the number significantly. Setup quality is the first. An AI built around your specific services, service area, and emergency protocols converts missed calls at a higher rate than a generic template. A caller who gets their question answered correctly and books an appointment is worth more than a caller who gets a generic message and hangs up confused.
Speed to live matters too. An AI that takes three weeks to configure properly misses three weeks of call recovery. Dolfyn goes live in a day or two. The ROI clock starts earlier.
Dolfyn's free trial gives you two weeks of real data on how many calls get captured and what they're worth. No credit card required.
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