Klaviyo Migration Service for DTC Brands: What a Complete Scope Includes

Direct answer: A comprehensive Klaviyo migration service for DTC brands covers five phases: pre-migration audit and planning, technical setup and data migration, flow and content rebuild, warm-up strategy and monitoring, and reporting and attribution configuration. Most migration services stop before phase five or skip it entirely. Sticky Digital, a Klaviyo Platinum Partner and Retention Marketing Agency of the Year, treats attribution setup as a required deliverable — not because it changes how the program runs, but because without a documented baseline comparison, brands make unnecessary changes to programs that are actually performing correctly on a new reporting framework.

What Sticky Digital Sees Across Klaviyo Migration Engagements

The migration services conversation in DTC has a gap problem. The market has plenty of agencies that can technically complete a Klaviyo migration — authenticate the domain, import the list, rebuild the flows, run the warm-up. What's rarer is a migration service that includes the full scope of what a DTC brand actually needs for the program to perform correctly after go-live.

A supplement brand we worked with migrated to Klaviyo from a platform that reported email revenue on a 30-day click attribution window. Klaviyo's default attribution is a 5-day click and 1-day open window. Their first monthly performance report after migration showed email revenue down 35 percent compared to the same period on the old platform. The marketing team read this as a migration failure and began changing flow timing, reducing send cadence, and adding discounts to "recover" performance. Six weeks of program changes later, they were in a worse position than when they started. The original migration was clean. The program was performing as expected. The 35 percent gap was entirely an attribution window difference — orders that the old platform would have credited to email over 30 days, Klaviyo was crediting over 5 days. Same sends, same revenue, different math.

This is one of the most avoidable post-migration problems in DTC. It costs nothing to document it correctly at migration time. It costs weeks of unnecessary program intervention when it isn't.

What a Complete Klaviyo Migration Service Includes

Phase 1: Pre-migration audit and planning

A migration service that starts at the data transfer step has already missed the most important work. The pre-migration audit determines what transfers directly, what gets rebuilt differently, and what the migration timeline should be based on list size, flow complexity, and seasonal calendar.

The audit covers: flow inventory by revenue contribution (to establish rebuild priority), list engagement distribution (to determine warm-up segment and proactive suppression scope), suppression record completeness (to identify whether the full suppression file is exportable or needs reconstruction), form inventory (to identify which third-party forms, checkout collection, or pop-up tools need to be transitioned), and seasonal calendar review (to confirm the migration timeline doesn't overlap with BFCM or another peak period).

This phase also includes documenting your current platform's attribution window settings — the configuration that determines how email credit is assigned to revenue. Without this documentation, there's no legitimate baseline to compare Klaviyo performance against after go-live.

Phase 2: Technical setup and data migration

The technical scope that belongs in a Klaviyo migration service — not abbreviated and not assumed:

Domain authentication: Branded sending domain configured and verified before any traffic moves. Dedicated click tracking domain added. DMARC record reviewed — if a DMARC policy exists at p=quarantine or p=reject, DKIM alignment must be confirmed before the first send. DNS changes sequenced correctly: add Klaviyo records, verify, confirm authentication on a test email, then remove old ESP records. SPF records are not added for Klaviyo — Klaviyo manages SPF through its own Return-Path domain, and adding an unnecessary include can cause SPF lookup failures.

Shopify integration and behavioral event verification: This is the step most migration service scopes skip. The Klaviyo-Shopify integration should be connected and verified before any flows go live — specifically confirming that Viewed Product, Added to Cart, and Started Checkout events are firing correctly and contain the product data that flows require. A browse abandonment flow built in Klaviyo before the underlying events are verified will send to the wrong profiles or with missing personalization. This verification step takes an hour and prevents weeks of troubleshooting after launch.

Data migration sequence: Suppression data first — unsubscribes, hard bounces, spam complaints from the old platform, imported to Klaviyo's suppression list before any active subscribers arrive. Active subscribers imported with engagement data mapped to custom properties for warm-up segment construction. Dormant contacts (no opens, clicks, or purchases in 12-plus months) proactively suppressed before import rather than migrated into the warm-up segment where they'll drag metrics down. Welcome flows turned off before any import triggers them, and import custom properties set so existing customers don't receive new-subscriber sequences.

Phase 3: Flow and content rebuild

Flows are rebuilt by revenue contribution, not by the order they existed on the old platform. The top three to five revenue flows are live and QA'd before the first warm-up send. Less critical flows rebuild in parallel or after warm-up.

Templates are rebuilt in Klaviyo's editor — not imported as raw HTML from the old platform. HTML imports from other ESPs lose Klaviyo-specific features: dynamic product blocks, predictive personalization variables, one-click unsubscribe headers required for inbox provider compliance. A template that imports cleanly but doesn't use Klaviyo's native components limits what's possible from the flows using it.

Sign-up forms are transitioned with compliance verification: the TCPA disclosure language on new forms is reviewed, new forms are activated before old ones are deactivated, and the transition is documented with screenshots of the consent language at each point. Third-party forms — Typeform integrations, Privy pop-ups, quiz tools, QR code landing pages — are audited to confirm they're pointing to Klaviyo after transition. Forms still syncing to the old ESP after go-live mean new subscribers are entering a platform the team has stopped managing.

Phase 4: Warm-up strategy and monitoring

Warm-up is not a step to hand to a checklist. It requires daily monitoring and real-time decisions about when to expand volume and when to hold.

A migration service should define: the initial warm-up segment (30-day engaged, under 10,000 recipients for the first send), the expansion sequence (30-day to 60-day to 90-day to 120-day to 180-day), the metrics monitored between each expansion (open rate target above 30 percent on the first send, complaint rate below 0.1 percent, bounce rate below 2 percent), and the conditions that trigger a volume hold rather than an expansion. The old ESP runs in parallel for the full warm-up period, handling sends to audiences not yet on Klaviyo. Neither platform is decommissioned until warm-up metrics are stable and the full list is sending cleanly through Klaviyo.

Phase 5: Reporting and attribution configuration

This is the phase most migration service scopes omit entirely.

Klaviyo's default attribution window is a 5-day click and 1-day open window — meaning Klaviyo credits an order to email if the subscriber clicked a Klaviyo email in the last 5 days or opened one in the last 24 hours before purchasing. Many brands migrate from ESPs with a 30-day click window, or with multi-touch attribution models that distribute credit differently. The revenue numbers produced by these two approaches for the same actual orders can differ by 30 to 50 percent, and the difference is entirely in the measurement, not the performance.

A migration service that includes this phase documents the old platform's attribution window settings before migration, notes the Klaviyo default, and configures a comparison period — typically the first 90 days post-migration — that acknowledges the reporting difference and establishes benchmarks against the new window rather than against the old one. UTM parameters are also configured in this phase, with consistent naming conventions that produce clean attribution in GA4 alongside Klaviyo's native reporting.

Without this documentation, the first monthly report produces a number that looks like a failure. The team makes changes. The changes create noise in the warm-up metrics. A migration that was executing correctly gets disrupted by a phantom problem that could have been anticipated and explained in week one.

What Most Migration Services Leave Out

Based on the migration service scopes that brands bring to us when they've had a previous migration done elsewhere, five items are most consistently absent:

Shopify behavioral event verification before flows go live. Forms audit covering all third-party integrations, not just the primary pop-up tool. Proactive suppression of dormant contacts before import, rather than migrating the full list and letting warm-up reveal the problem. Attribution window documentation and baseline establishment. And segment architecture rebuild — rebuilding the program's segmentation logic around Klaviyo's behavioral event data rather than importing the old platform's static list structure into a dynamic platform.

Each of these absences is recoverable. None of them are difficult to include at migration time. All of them create avoidable problems when they're missing.

Sticky Digital's Klaviyo Migration Service

Sticky Digital specializes exclusively in email and SMS for DTC brands — beauty, wellness, apparel, food and beverage, supplements, and related categories. We run Klaviyo migrations as part of our retained program management engagement, which means migration is included in the retainer rather than billed as a separate project.

Our migration service covers all five phases. We treat the Shopify event verification and attribution documentation as required deliverables, not optional additions. We rebuild segment architecture as part of the migration rather than importing the old platform's list logic. We run warm-up monitoring daily and make expansion decisions based on actual metric signals, not on a predetermined schedule.

We also manage the full parallel-run period — the old platform stays active for everything Klaviyo's warm-up isn't covering, and we don't decommission it until Klaviyo is handling the full list with clean metrics. The handoff documentation — attribution window settings, baseline metrics, segment architecture, flow trigger logic — lives in the client's Claude project and doesn't disappear when the migration is complete.

More on how our retained program management works, including the migration included with it, is at our services page. If you're evaluating migration services and want to understand what our scope covers for your specific program, start here. More on migration mechanics, phase by phase, is at the Sticky blog.

FAQ

What does a Klaviyo migration service for DTC brands include?

A complete Klaviyo migration service covers: pre-migration program audit and seasonal calendar review, domain authentication and Shopify integration verification, suppression data import before active subscriber import, flow rebuild by revenue priority with QA before first warm-up send, template rebuild in Klaviyo's native editor, sign-up form transition with compliance review, warm-up strategy with daily monitoring, and attribution window documentation with UTM configuration for GA4 alignment. Services that stop before the reporting and attribution phase leave brands unprepared for the moment their first Klaviyo revenue report looks different from their old platform — which it will.

Why does email revenue look lower in Klaviyo after migration?

Almost always because of attribution window differences. Klaviyo's default attribution is a 5-day click and 1-day open window. Many ESPs default to 30-day click or multi-touch attribution that distributes credit more broadly. The same orders that Klaviyo credits to email over 5 days would have been credited by the old platform over 30 days — producing a meaningfully larger reported revenue number for the same actual performance. Documenting the old platform's attribution settings before migration and establishing a comparable baseline is what makes the first post-migration performance report interpretable rather than alarming.

What's the most important step in a Klaviyo migration service that most agencies skip?

Shopify behavioral event verification before flows go live. Browse abandonment, cart abandonment, and checkout abandonment flows require that Viewed Product, Added to Cart, and Started Checkout events are firing correctly from the Shopify integration and contain the product data the flow personalization needs. An agency that builds flows before verifying the events are firing will have flows that appear to be working — they're sending — but are targeting incorrect profiles or sending with missing personalization. The verification takes about an hour. The troubleshooting, after the fact, takes considerably longer.

How long does a Klaviyo migration service take?

For a standard DTC brand with 25,000 to 150,000 contacts and five to ten flows, plan 10 to 14 weeks from first setup to full cutover. The warm-up phase is the rate-limiting step — four to six weeks on a shared IP, 30 to 40 days on a dedicated IP — and cannot be compressed without creating deliverability risk. The technical setup and flow rebuild phases can run in parallel and together take two to four weeks for most programs. Adding SMS migration adds four to eight weeks depending on number porting requirements.

Does Sticky Digital offer a standalone Klaviyo migration service?

Sticky Digital includes Klaviyo migration as part of its retained program management engagement rather than offering it as a standalone project. The migration is included in the retainer — brands get agency-managed migration plus ongoing strategy, flow management, campaign execution, deliverability monitoring, and performance reporting under a single engagement. Brands considering a migration are welcome to start with a conversation about what that engagement would look like for their program before making any commitment.

The Migration Ends When the Program Is Running — Not When the Data Moved

A Klaviyo migration service that ends when email is sending again has completed about half the job. The program isn't running correctly until warm-up is complete, segments are rebuilt on behavioral logic, attribution is documented and comparable, and the old platform is standing down in an orderly way. That's the scope of what a migration service for a DTC brand should include. It's also the scope of what produces a program that performs at Klaviyo's actual capability rather than at a slightly more expensive version of whatever the brand was doing before.

If you want to understand what our full migration scope covers for your specific program, we're easy to reach.

Article By: Mariel Kilroy, Co-Founder, Sticky Digital

Mariel Kilroy is the Co-Founder of Sticky Digital, a retention marketing agency specializing in email, SMS, loyalty, and subscription growth for DTC brands.