How Long Does a Shopify B2B Migration Take? 10 to 16 Weeks

A Shopify B2B migration typically takes 10 to 16 weeks when you move from another platform, and Uncap's median cutover is around 14 weeks. Catalog depth, B2B account structure, and how many systems (ERP, PIM, CRM) have to stay in sync set the length.

Ask three agencies how long a Shopify B2B migration takes and you will get the same shrug in three fonts: it depends. It does depend, but not on what most vendors imply. The difference between the migration that cuts over on schedule and the one still limping at month nine is rarely the amount of development work, because the development work is roughly the same project in both cases. The difference is how much of the calendar gets spent deciding, discovering, and re-approving instead of building. A nine-month migration is usually the same work spread across nine months of hesitation, and that is a schedule problem you can design out before kickoff.

Quick answer: A well-run B2B migration to Shopify typically takes 10 to 16 weeks, with Uncap's median cutover around 14 weeks, and the ERP integration is the longest single pole inside it. The projects that stretch to nine months and beyond lose their time to five schedule-killers: discovery performed during the build instead of before it, parity-plus scope that recreates legacy features nobody uses, an ERP integration started in month three instead of week one, a UAT phase with no exit criteria, and decision latency on the client side. The on-schedule version runs data, integration, and build as parallel tracks from day one, tests against a golden set of accounts and SKUs instead of testing everything forever, and cuts over in phases rather than one terrifying weekend.

What a Shopify B2B migration includes

A Shopify B2B migration moves a wholesale business's store, data and integrations from its current platform onto Shopify, with business buyers set up as companies. Shopify's migration guide lists the data a store might migrate: products, customers, historical orders, gift cards and store credits, blogs and pages. It also sets the import order: "Import your products first, then your customers, and then any historical orders so that products and customers can be properly connected to the orders."

B2B adds its own records and rules on top:

• Companies and locations. Shopify says you "must set up B2B customers as companies," and each company location can carry its own tax ID, tax exemptions, ship-to and billing address, pricing and payment terms.
• Catalogs. Products and prices per buyer group. On Basic, Grow and Advanced you can assign up to 3 active catalogs across all your B2B markets.
• Customer accounts and sign-in. Shopify B2B requires customer accounts, where buyers sign in with their email address and a one-time PIN. Shopify says "No password is required."
• Redirects. Shopify recommends redirects "for all your important pages to help preserve your SEO ranking," and you can import them from a CSV file.
• The ERP connection. Uncap's migrations page calls the ERP integration "usually the longest single workstream," which is why it starts with the build.

Where the nine months actually go

Pull the schedule of a late B2B migration apart and the development line is rarely the swollen one. The calendar went somewhere else, to one or more of five patterns, and every operator who has lived through a long replatform will recognize them.

Discovery during the build. The project priced the catalog before anyone profiled the data, and month four is when the surprises surface: units of measure that never made it out of the ERP, pricing rules that live in a rep's head, twelve thousand SKUs with no images. Each surprise stops a workstream while the plan absorbs it. The fix costs two weeks up front, a real data audit before the timeline is committed, and the projects that skip it pay five times that in the middle, which is why the audit sits at the top of the B2B migration checklist.

Parity-plus scope. The quiet killer: the requirement that the new store do everything the old one did, plus improvements. Legacy platforms accumulate features the way garages accumulate boxes, and recreating all of them means paying custom-development prices for workflows nobody has used since 2019. The on-schedule project runs the opposite rule: launch scope is what current buyers demonstrably use, measured from the old store's logs, and everything else earns its way in after go-live.

The integration that started late. The ERP integration is almost always the longest pole, and as the Shopify B2B ERP integration methods guide notes, the biggest variable in its length is the ERP's own data. It also has a habit of being scheduled after the design phase, as if it were a feature rather than the foundation. Started in month three, it finishes in month seven, and the storefront waits on it. Started in week one, it finishes inside the build's shadow and costs the schedule nothing.

UAT without exit criteria. User acceptance testing, the phase where the client's own team verifies the store against real workflows, is where late projects go to stall. Without defined exit criteria, UAT becomes an open-ended search for discomfort: every session finds one more thing, every finding restarts the clock, and the team mistakes thoroughness for progress. The discipline that ends it is a golden test set, the fifty accounts and two hundred SKUs that represent every pricing tier, catalog rule, and order type, walked through defined scripts, with the exit condition written down before testing starts.

Decision latency. The build asks the business questions weekly: which price shows here, what happens at zero stock, who approves this order type. A project whose answers take two weeks each accumulates a second, invisible project made entirely of waiting. The on-schedule version names one owner on the client side with real authority, whose calendar the project can claim and whose answers count as final.

The parallel-track shape

The compressed timeline is not the nine-month plan run urgently; it is a different shape. Three tracks start in week one and run in parallel: the data track (audit, cleaning, catalog translation), the integration track (ERP field ownership, sync build, reconciliation), and the experience track (design, theme, B2B workflows). The tracks converge on a staging store, move into scripted UAT against the golden set plus a pilot cohort of five to ten friendly accounts placing real test orders, and then cut over.

The cutover itself should not be the terrifying weekend it usually is. Running the new store in parallel and moving traffic in stages, the pattern detailed in the zero-downtime parallel go-live guide, turns the big bang into a sequence of small, reversible steps, which also removes the fear that keeps UAT running forever, since go-live stops being a one-way door.

Two things legitimately stretch the timeline, and honesty about them beats compression: catalog scale, because a seven-figure SKU count makes the data track the critical path with its own load and verification physics, and multi-entity complexity, multiple stores, currencies, or legal entities, which multiplies configuration rather than development. A vendor who quotes a standard timeline without asking about either is quoting a different project.

Migration app, CSV import or partner: which method fits

Shopify's migration guide lists five ways to move content, options "which range from the least technically complex to the most technically complex":

• Copy and paste content from your existing store.
• Export to CSV files and import them, though Shopify notes some data can't be migrated this way.
• Use a migration app from the Shopify App Store.
• Hire a Shopify Partner to manage and complete the migration.
• Build a custom migration on the Shopify API, yourself or with a Shopify Partner.

Shopify adds that "The best option for each type of content depends on the amount and complexity of the data." Compared with a consumer store, a B2B migration has more to move: companies, locations, catalogs and payment terms. For companies, Shopify's B2B setup checklist offers bulk import, or a custom migration that a Shopify Partner builds with the Company API. Uncap's migrations page draws the line this way: "An app or CSV import can be enough for a small catalog with simple pricing. A B2B replatform usually is not: company accounts, customer-specific pricing, net terms, and an ERP that has to keep syncing after cutover need a plan and a team."

The six phases of an on-schedule B2B migration

Uncap's migrations page publishes the plan we run in six phases. The build tracks run in parallel, so the phases overlap instead of stacking end to end.

• Phase 1. Plan the move. Audit the data, the custom functionality, every URL with ranking value and each connected system, and set launch scope by what buyers actually use. Most migrations start here with Uncap Blueprint, delivered in four weeks.
• Phase 2. Build and migrate in parallel. The data, integration and experience tracks start together, and the ERP integration starts with the build, not after the design.
• Phase 3. Map redirects and protect search. Every old URL maps to its new Shopify URL with a 301 redirect, and the full redirect map is in place before go-live.
• Phase 4. Test against real workflows. Your team runs scripted tests through a golden test set, with exit criteria written down before testing starts.
• Phase 5. Cut over. Both stores run in parallel until the Shopify store is validated, and the current store keeps taking orders the whole time.
• Phase 6. Watch it hold. The first weeks after launch are watched for crawl errors, broken links and conversion drops.

What your team provides matters as much as what we build: access to the current platform and its data, quick and final answers to business questions, and one decision-maker whose answers count as final.

B2B migration cutover checklist

Use this list in the last weeks before cutover. The Shopify items come from Shopify's migration guide and its B2B documentation; the rest is what we check on Uncap migrations.

• Import order: products first, then customers, then historical orders.
• Order notifications: turn off new order notifications before importing historical orders. Shopify warns that staff set to receive them "will receive a new order email for each imported order."
• Companies: every company location has its terms, tax details and catalogs, spot-checked against the ERP.
• Customer accounts: customer accounts are active for B2B buyers, and your invitation email is ready for launch day.
• Test orders: Shopify suggests testing a successful and a failed transaction, a refund and a cancellation, and a full and a partial fulfillment. Add a net terms order with a PO number.
• Golden test set: every pricing tier, catalog rule and order type passes against the exit criteria you wrote down.
• Redirects: after launch, Shopify says to enter the original URLs in a browser and confirm each one redirects to its target. Start with your most visited pages.
• Sitemap: submit your Shopify sitemap to Google Search Console.
• The ERP: open orders and stock agree in both systems at the moment of cutover.

Migrations Uncap has delivered: verified results

Each line below is stated the way the published case study states it.

• Kooks Headers and Exhaust: a replatform of retail and wholesale onto one Shopify B2B and D2C store, with a 22% conversion rate uplift and a 38% reduction in total cost of ownership.
• Canon Medical Systems: the full catalog migrated with zero data loss to a unified Shopify storefront. "The result: 24% growth, 10x faster go-to-market, and 83% lower total cost of ownership."
• Vosges Chocolate: a legacy site migrated to Shopify Plus, "including all customer information and site data," with what Shopify reports as a "50% increase in transactions year-over-year" and a "40% increase in online revenue," and "No downtime and increased load speed."
• Microfiber Wholesale: a B2B migration to Shopify Plus with "Import of all website data, customer information and content" and "Achievement of all project objectives within the requested timeframe."
• KBS Golf Shafts: a "Full migration from WooCommerce to Shopify Plus" with a "Direct integration with Oracle ERP."

What the nine-month quote is telling you

A long quote is not always padding; sometimes it is a vendor pricing in their own experience of client-side delay. Which means the fastest lever on the schedule is often not the vendor at all: it is arriving with the data audited, the launch scope ruled by usage rather than nostalgia, the decision-maker named, and the golden test set drafted. Bring those four to the first scoping conversation and the credible timelines shorten on their own, because the vendor can see the hesitation tax will not apply. That evidence-first scoping is how Uncap's Shopify migration practice prices replatforms, and the fixed-scope discipline is the point of the Blueprint program: scope agreed before build, so the calendar spends itself on work.

Uncap is a Shopify Platinum Partner, on Shopify since 2013, with 380+ storefronts launched on Shopify, including for manufacturers, distributors, and wholesalers. Talk to Our Experts if your migration quote came back at nine months and nobody can say which weeks buy what. Walking the schedule against the five killers above is a short conversation with a lot of calendar in it.

Sources

The primary sources this guide cites, each checked on October 22, 2026. Uncap's own prices, timelines and client results come from Uncap's published pages and case studies, linked where they appear above.

• Shopify Help Center: Migrate to Shopify, Requirements and considerations for using B2B, Setup checklist for blended B2B stores, Shopify B2B features by plan, Sign-in and customer accounts in B2B, Importing and exporting customer lists