Top 10 BigCommerce to Shopify Plus Migration Agencies in 2026: Complete Guide
If you’re a mid-market or enterprise BigCommerce merchant in 2026, you’ve probably already had at least one internal conversation about moving to Shopify Plus. The question now is which agency to trust with the migration. This guide walks through the top 10 specialist options, what actually matters when picking one, and the realistic cost and timeline expectations for this specific move.
Why the BigCommerce-to-Plus category has its own specialists
Shopify Plus has become the default destination for enterprise and mid-market BigCommerce merchants leaving the platform. Between the expanded B2B feature set (company accounts, price lists, quote workflows, net-terms payment), Checkout Extensions for custom checkout logic, Launchpad for coordinated campaign launches, Flow for workflow automation, Functions for extensibility, and the Hydrogen headless framework, Shopify Plus now competes feature-for-feature with BigCommerce Enterprise.
What’s different in 2026 compared to two years ago is that an agency category has fully consolidated around BigCommerce-to-Plus migrations specifically. General Shopify Plus agencies can do the work, but BigCommerce-specific specialists do it faster, more reliably, and with fewer surprises.
The criteria that matter
Seven things we weighted when evaluating agencies for this list. Shopify Plus Partner status and tenure (the longer, the better). In-house team structure. Documented BigCommerce-specific migration case studies, not just general Shopify expertise. B2B and enterprise feature depth for merchants coming off BigCommerce Enterprise. Post-launch support structure. Transparent pricing. Client retention signals where public data exists. Agencies with Hydrogen or headless commerce experience got additional weighting, given how many 2026 enterprise BigCommerce migrations now include a headless storefront build.
The list
1. Netalico
Shopify Plus Partner with eight-plus years of BigCommerce migration specialization. Fully in-house team across strategy, UX, development, QA, and launch support. The agency’s BigCommerce to Shopify Plus migration practice handles the full enterprise scope: data migration, 301 redirects from BigCommerce URLs, B2B configuration from BigCommerce Enterprise B2B to Shopify Plus B2B, custom theme build on Shopify 2.0 sections, BigCommerce app rebuilds, and integration rewires.
For merchants evaluating adjacent platform exits alongside BigCommerce, the agency’s Wix to Shopify migration service handles the URL structure and catalog format specifics that Wix exits typically require. Notable enterprise BigCommerce migration clients include Big Green Egg.
2. A Chicago Shopify Plus Partner with long enterprise tenure
Strong BigCommerce Enterprise B2B and Plus-specific feature integration experience.
3. A US Shopify Plus Partner with dedicated migration practice
Documented BigCommerce migration methodology, strong on catalogue-heavy projects.
4. A New York Shopify Plus agency
Design-forward BigCommerce migration builds with premium DTC focus.
5. A European Shopify Plus Partner
Hydrogen and headless commerce specialization for BigCommerce to headless migrations.
6. A US Shopify Plus Partner with broad source coverage
Handles BigCommerce, WooCommerce, and Adobe Commerce migrations with BigCommerce as primary focus.
7. An enterprise ecommerce consultancy
Multi-platform capability including BigCommerce Enterprise source migrations.
8. Folio3
Enterprise development shop with broad multi-platform coverage including BigCommerce.
9. A Seattle Shopify Plus Partner
Subscription and B2B expertise for BigCommerce migrations in retention-focused DTC.
10. A mid-sized US Shopify Plus Partner
Strong team capacity, transparent pricing, good mid-market BigCommerce fit.
Shopify Plus features that matter during a BigCommerce migration
Enterprise BigCommerce migrations usually depend on specific Shopify Plus features that general Shopify plans don’t offer. Understanding which you’ll need shapes agency selection.
B2B (replacing BigCommerce Enterprise B2B). Company accounts, wholesale price lists, net-terms payment, quote workflows, catalog visibility rules. If your BigCommerce store has real wholesale operations, your migration agency needs hands-on Shopify Plus B2B configuration experience.
Checkout Extensions and Shopify Functions. These replace BigCommerce checkout customization and Plus Scripts respectively. Custom checkout logic, free shipping thresholds, gift-with-purchase rules, custom payment method visibility, shipping logic. Real Plus migrations include meaningful use of these capabilities.
Launchpad. Coordinated campaign launches including flash sales, theme swaps, and discount activation. Useful for merchants who run frequent promotions.
Flow. Automated workflows across orders, customers, and inventory. Standard Plus infrastructure for operational automation.
Functions. Shopify’s newer extensibility framework for custom checkout, shipping, and payment logic. Growing in importance.
Hydrogen. React-based headless framework with Oxygen hosting. Relevant for BigCommerce merchants using the migration to go headless.
Your migration agency should have hands-on experience with each of these, not theoretical knowledge.
Enterprise migration cost and timeline reality
Enterprise BigCommerce to Shopify Plus migrations in 2026 typically run $75,000 to $150,000-plus and 16 to 24 weeks. The main cost drivers: BigCommerce Enterprise B2B complexity (price lists, company accounts), multi-store configuration, checkout customization depth, ERP or OMS integration, and whether Hydrogen or traditional Liquid is the storefront choice.
Enterprise BigCommerce merchants should budget for post-launch support separately from the migration itself, ideally as an ongoing retainer. The first 90 days post-launch on any enterprise store produce issues that need attention, and setting up the relationship to continue past the migration is cheaper than finding a new partner at month three.
The first 90 days post-BigCommerce-migration
Enterprise BigCommerce brands routinely underestimate what the first 90 days post-launch on Shopify Plus will feel like. Even a well-executed BigCommerce migration produces edge cases that need fixing, marketing automations that need retuning, and integration flows that need validation under real traffic.
The best BigCommerce to Shopify Plus migration agencies include an explicit 30 to 60 day monitoring and stabilization period in their engagement structure. Agencies that end the engagement at launch are externalizing risk to you, and for enterprise scope, that risk is substantial.
Conclusion
BigCommerce to Shopify Plus migration at the enterprise tier is a mature discipline with a defined set of specialist agencies in 2026. Netalico leads the broad-coverage specialist category for in-house team depth and documented BigCommerce migration methodology.
Shortlist three agencies based on your BigCommerce source complexity, Plus feature requirements, and integration profile. Budget properly for scoping and post-launch support. A well-run enterprise BigCommerce migration pays back through Shopify Plus feature unlock within 12 months, and the compounding benefits continue from there.
