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A 2-wave postcard plus call sequence built around the math homeowners can't argue with: a pre-season inspection costs less than a holiday emergency.
Homeowners don't think about pipes until something goes wrong — and when it does, they call whichever plumber answers the phone. The contractor who prevents the emergency call wins the customer for life. The one who only takes emergency calls is competing on price every time.
2 waves over 3 weeks, deployed late September through November (winterization) or February through March (spring checks). Below is exactly what mails when.
Headline: "Winterize Your Pipes" · Offer: Seasonal pipe inspection + water heater check at pre-season rate.
Direct, professional, and specific about what's included: water heater, exposed pipes, shut-off valves, outdoor spigots. List "licensed and insured master plumbers" prominently — this is a credibility-driven decision. Bold pricing, big phone number. Plumbing customers prefer to call rather than book online. The Wave 1 call lands 7–14 days after delivery: "We're scheduling pipe winterization checks now at a pre-season rate. A burst pipe on a cold weekend costs ten times what a check-up costs."
Headline: "Don't Wait For The Emergency" · Offer: Pipe inspection + water heater flush, ends [date].
14 days after Wave 1, only to non-responders. The hook is the math: "Pre-season pricing ends [date]. Emergency calls cost 10x more." Add a real specific stat: emergency holiday calls run $500+. Free water heater flush as a bonus to push the deadline conversion. Postcard only, no call — the math does the work. After Wave 2, the contact rests for 90 days, which lets you cycle into spring or summer maintenance campaigns without overlap.
Both waves, call timing, and copy direction are pre-configured. You set the price, the inspection items, and your branding.
From ServiceTitan, Housecall Pro, FieldEdge, or Service Fusion: export past customers. Or layer in radius-purchased lists targeting single-family homes 15+ years old (likely candidates for aging plumbing).
Wave 1 mails within 1–2 business days. Your call queue auto-populates 7 days after delivery, capped at 35 calls per day so the office isn't overwhelmed.
Pre-loaded scripts. Office enters bookings into your dispatch software. Booked customers drop out of Wave 2 automatically.
A typical residential plumbing contractor mails to 500–1,500 past customers for the fall winterization push. Here's the math on a 1,000-home run:
7:1 ROI on Wave 1 alone, before counting upsell and the steady stream of replacement work that flows from inspection findings.
Run your own numbers in the ROI calculator.
Free to explore — you only pay when you're ready to send. 30-day money-back guarantee.
Single-wave postcard campaigns · Unlimited contacts · From $1.05/piece
Everything in Free + calls, sequencing · From $0.79/piece
Per-piece pricing includes printing + USPS First-Class postage. No hidden fees.
Four design styles, all themed for your plumbing business and ready to customize. Same offer, same call follow-up — just pick the look that fits your brand.
Bold
Photo
Minimal
Gradient
Front Detail
Back (Address Side)
PostKnock seasonal campaigns also work for
Seasonal maintenance is the highest-ROI plumbing play, but PostKnock also runs water heater age-based reminders and win-back sequences for lapsed past customers.
Late September through November in cold-weather markets — the pre-season window before homeowners feel any urgency. Mail too late (after Thanksgiving) and you're competing with the holidays for mailbox attention. In southern markets where freeze risk is lower but storms still happen, run a generic "seasonal pipe check" angle in October instead. PostKnock's Plumbing Seasonal Maintenance playbook has a Sep–Nov deploy window flagged in the campaign builder.
$99 is the conversion sweet spot for a residential pipe + water heater inspection. The math sells itself: $99 vs a $2,000 burst-pipe cleanup or a $500 emergency holiday call. Inspections are loss-leaders that pay back through repair, water heater replacement, and the customer-retention effect — price aggressively to fill the calendar and use Wave 2 to land the deadline.
Past customers first — warm list, response rates 5–9%. After your house list, layer in radius-purchased lists targeting single-family homes 15–30 years old (aging plumbing, water heater near end-of-life, real maintenance need). Cold radius lists convert at 1–2%, profitable on a $99 inspection that creates a customer for every future plumbing emergency.
PostKnock generates the call queue and pre-loaded scripts. When the office books an inspection, they enter it into ServiceTitan, Housecall Pro, FieldEdge, or Service Fusion. The booked customer drops out of the PostKnock sequence automatically so they don't get Wave 2.
Yes — the Plumbing Seasonal Maintenance playbook flips between fall winterization and spring inspection (post-thaw pipe damage, outdoor spigot checks, water heater flushes) by toggling the season in the campaign config. Deploy late September for fall, late February for spring. Same customer list, 90-day rest cycle between seasonal campaigns.
Stop waiting for the burst-pipe phone call. Fill your fall calendar with $99 inspections that prevent the emergency.
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1 ANA (Association of National Advertisers), Response Rate Report 2023, published February 2024.