Case Studies & Worked Examples
Realistic ROI walkthroughs for direct mail campaigns across the verticals PostKnock serves — built from industry-benchmark response rates (ANA, USPS) and our real pricing, so you can model your own numbers.
PostKnock originals
Dental · Recall ROI
Dental Recall Campaign: 3 Waves, $30K ROI
Hypothetical 4-chair family practice, 600 lapsed patients, 3-wave postcard + phone follow-up campaign at $1,719 total cost. Models 8% cumulative response, 48 reactivated patients, $57,600 first-year revenue, 33:1 ROI.
Read worked example →HVAC · Seasonal Tune-Up
HVAC Spring Tune-Up: 1,500 Customers, $33K Revenue
Hypothetical 8-tech residential operation, 1,500 inactive past customers, 2-wave spring maintenance campaign at $2,469 total cost. Models 75 booked tune-ups, $33K ticket revenue plus $7,560 maintenance plan recurring.
Read worked example →Optometry · Insurance Recall
Optometry Benefits Recall: $19K From 800 Postcards
Hypothetical solo-doctor practice, 800 patients with year-end vision benefits expiring, 2-wave use-it-or-lose-it campaign at $1,363 total cost. Models 6% response, 48 booked exams, $22,700 revenue with multi-pair upsell.
Read worked example →Chiropractic · Care Plan Reactivation
Chiropractic Care Plan: 5% of Lapsed Patients in 90 Days
Hypothetical solo-DC practice, 400 patients lapsed mid-care-plan, 3-wave reactivation campaign at $1,245 total cost. Models 5% response, 20 reactivated patients, $20K first-year revenue. Includes the conversion call script.
Read worked example →Pest Control · Annual Renewal
Pest Control Annual Renewal: $22K From 1,000 Customers
Hypothetical 4-tech residential pest control operation, 1,000 expiring annual contracts, 2-wave continuity-focused renewal campaign at $1,679 total cost. Models 50 renewals at $450 average, $25,500 revenue with 30% add-on attach.
Read worked example →Healthcare
Veterinary · Wellness Recall
Veterinary Wellness Recall
2-vet small-animal hospital, 1,200 pets overdue for annual wellness, 2-wave postcard + reminder call campaign. Models 5.8% response, 70 booked exams, $32,200 revenue at 4.5x ROI.
Read composite case study →Physical Therapy · Progress Restart
PT Progress Restart
Solo-clinician PT practice, 280 patients who stopped attending mid-plan, 3-wave "finish what you started" campaign. Models 4.6% response, 13 restarts, $11,830 revenue at 3.4x ROI.
Read composite case study →Audiology · Annual Hearing Test
Annual Hearing Test Recall
Solo audiologist, 480 patients overdue for annual hearing test, 2-wave recall + reminder call. Models 4.1% response, 20 booked tests, $14,800 revenue at 5.6x ROI.
Read composite case study →Orthodontics · Free Consult Blitz
Free-Consult Acquisition
Solo orthodontist, 800-piece neighborhood farm to families with school-age kids, 2-wave free-consult campaign. Models 4.5% response, 18 started cases, $86,400 revenue at 25x ROI.
Read composite case study →Dermatology · Skin-Cancer Screening
Annual Skin-Cancer Screening
2-derm practice, 600 patients overdue for annual skin check, 2-wave clinical recall. Models 5.2% response, 31 booked screenings, $9,300 revenue plus 4 high-LTV referrals at 2.7x ROI.
Read composite case study →Podiatry · Diabetic Foot Care
Diabetic Foot-Care Recall
Solo podiatrist, 240 diabetic patients overdue for protective foot exam, 2-wave clinical recall + reminder call. Models 6.1% response, 15 visits, $5,100 revenue at 1.9x ROI.
Read composite case study →Home Services
Plumbing · Water-Heater Replacement
Water-Heater Replacement
5-tech residential plumber, 1,400 past-customer households with water heaters 8+ years old, 2-wave proactive replacement campaign. Models 2.0% response, 28 replacements, $58,800 revenue at 14x ROI.
Read composite case study →Landscaping · Spring Cleanup
Spring Cleanup Acquisition
Owner-operator landscaping crew, 1,200-piece neighborhood farm in established suburbs, 2-wave spring-cleanup campaign. Models 2.0% response, 24 cleanups, $9,600 revenue at 4.4x ROI plus seasonal renewal pipeline.
Read composite case study →Roofing · Post-Storm Response
Post-Storm Hyperlocal Response
Owner-operator roofer, 900-piece post-hailstorm hyperlocal campaign within 72 hours of event. Models 6.8% response, 28 inspections, 12 jobs at $98,400 revenue, 31x ROI.
Read composite case study →Pool Services · Spring Opening
Spring Opening Recall
4-tech pool service operation, 800 past spring-opening customers, 2-wave seasonal recall + reminder call. Models 2.8% response, 22 openings, $9,900 revenue at 4.7x ROI.
Read composite case study →Cleaning · New-Mover Welcome
New-Mover First-Time Customer
3-team residential cleaner, 950-piece monthly new-mover farm in suburban core, 2-wave welcome campaign. Models 2.8% response, 27 first cleans, $5,940 revenue at 2.6x ROI plus recurring pipeline.
Read composite case study →Auto
Auto Repair · Overdue Service
Overdue Service Reminder
5-bay independent shop, 1,500 customers overdue on factory-recommended service, 2-wave personalized recall. Models 1.2% response, 18 returns, $9,360 revenue at 2.9x ROI plus pipeline.
Read composite case study →Oil Change · Quarterly Reminder
Quarterly Mileage Reminder
2-bay quick-lube, 2,000 past customers due for next oil change, 2-wave reminder + add-on upsell. Models 1.6% response, 32 visits, $2,560 revenue + tire and air-filter attach at 1.4x ROI.
Read composite case study →Smog Check · Renewal Proximity
Registration Renewal Proximity
California smog station, 1,800 vehicles approaching biennial registration-renewal smog check, 2-wave timing-targeted campaign. Models 2.2% response, 40 visits, $2,200 revenue at 1.0x first-visit ROI.
Read composite case study →Finance
Real Estate · Just-Listed Farm
Just-Listed Neighborhood Farm
Solo agent, 600-home neighborhood just-listed farm with 3-postcard cadence. Models 0.8% direct response, 4 buyer leads, 2 listing conversations, projected 1 listing at $11K commission, 3.4x ROI.
Read composite case study →Insurance · Auto Renewal Recall
Auto Policy Renewal Proximity
Independent insurance agency, 350 auto-policy holders 60 days from renewal, 1-wave proactive re-shop campaign. Models 11.4% response, 40 re-quote conversations, $9,600 retained-premium uplift at 11x ROI.
Read composite case study →Tax & CPA · Q4 Planning Blitz
Q4 Year-End Planning
Solo CPA, 220 past tax-prep-only clients, 1-wave Q4 advisory recall. Models 4.6% response, 10 planning engagements at $4,800 revenue plus 4 conversions to recurring advisory at projected $14,400 ARR.
Read composite case study →Personal & Wellness
Med Spa · Membership Relaunch
Med Spa Membership Relaunch
4-room med spa, 320 lapsed members, 2-wave relaunch with phone follow-up. Models 3.4% response, 11 reactivations, $9,240 first-year revenue at 3.2x ROI.
Read composite case study →Hair Salons · Color Client Winback
8-Week Color Client Winback
4-chair salon, 380 lapsed color clients past their 8-week cycle, 2-wave winback with stylist-specific personalization. Models 3.2% response, 12 rebooks, $2,640 revenue plus retention pipeline.
Read composite case study →Yoga Studios · New-Mover Welcome
New-Mover First Class Free
Single-location yoga studio, 800-household monthly new-mover farm in 3-mile radius, 1-wave first-class-free welcome. Models 3.4% response, 27 first-class redemptions, 11 monthly-membership conversions at $1,177/mo recurring.
Read composite case study →Martial Arts · Kids Trial Class
Kids Trial Class
Single-school martial arts academy, 600-household neighborhood farm targeting families with kids 5-12, 2-wave trial-class campaign. Models 2.8% response, 17 trials, 9 enrollments at $129/month recurring.
Read composite case study →Dance Studios · Fall Registration
Fall Registration Open House
Multi-program dance studio, 700-household family farm + past-student recall, 2-wave fall-registration campaign. Models 3.6% response, 25 open-house RSVPs, 16 enrollments at $1,840/mo recurring.
Read composite case study →Personal Training · 6-Week Challenge
6-Week Body Transformation
Solo personal trainer, 500-piece hybrid lapsed-client + warm-prospect list, 2-wave 6-week-challenge campaign. Models 2.8% response, 14 challenge sign-ups at $399 each = $5,586 revenue plus 6 conversions to recurring training at 11x ROI.
Read composite case study →Want to model your own campaign?
Plug your customer count, average ticket, and target response rate into our ROI calculator to see what a campaign like these returns for your business.