How to Choose a Shopify Migration Agency in 2026 (15 Questions to Ask First)

What happens to a store that spends years earning its rankings, then moves to Shopify and watches traffic fall the week after launch?

That story plays out more often than founders expect. A brand picks its new platform, signs with the first agency that replies, and rushes the build. Products move across fine, but a few redirects get missed, and search visibility quietly slips. By the time the revenue dip shows up in reports, the cause is weeks old. 

The move itself is rarely the problem. The partner you choose to run it usually is. A short, structured vetting process, done before any contract is signed, keeps the switch calm and protects what you have already built.

Choose a Shopify migration agency by checking platform experience, migration process, SEO protection, data scope, integrations, QA, launch support, ownership terms, and proof from similar projects. Strong partners show evidence, not promises.

Why Agency Selection Matters More in 2026

Replatforming touches data, design, checkout, and search at once. A small planning gap can cause ranking drops, broken links, and lost orders, so vetting the agency running it is the most important decision in the move. 

Platform moves change URL structure, so old links often stop working after launch. Shopify’s migration guidance recommends mapping redirects so customers and search engines reach the right page.

Scope review matters too. Products, orders, apps, payments, and taxes each need a plan, so large catalogs should weigh quotes against clear Shopify migration services first.

15 Questions to Ask Before You Hire a Migration Partner

These 15 questions test platform fit, data care, SEO safety, launch planning, and support. Each answer below shows what a strong Shopify migration agency should tell you, and what a vague reply signals.

Questions 1 to 8: Process, Data, and Design

1. Have you migrated stores from our current platform before?

Source platform shapes the entire plan, since each one stores data, URLs, and business logic differently. A strong agency names the stores they moved, the platform each came from, and the problems they solved along the way. WooCommerce and BigCommerce moves often hinge on replacing the app and plugin stack, while Magento projects tend to carry the heaviest URL and ERP complexity. Ask what broke on their last few projects, since real experience shows up in the problems a team has already solved.

2. Can You Show Work From a Similar Catalog Size and Order Volume?

Scale changes the migration plan more than most founders expect. Scale changes everything. A 200-SKU store on a stock theme behaves nothing like a 10,000-SKU catalog with custom checkout and ERP sync. The same source platform can carry a 5 to 10 times cost difference based on that complexity alone.

Ask for examples near your SKU count, monthly order volume, and integration depth. When you request a quote, describe your store in detail. How many products, which plugins, what integrations, how many monthly orders, and whether you run subscriptions or B2B workflows. That specificity is what produces an honest number.

3. What Does Your Migration Discovery and Planning Process Include?

Discovery is where structural gaps surface before they become budget problems. A capable agency starts with a full audit before any import runs. That means products, variants, collections, customer records, order history, URLs, apps, and integrations, each mapped to a clear destination in Shopify before the first file moves. Richer source data does not always map cleanly into Shopify. Standard products support up to three option types and 100 variants, so anything beyond that has to be flattened or held in metafields and metaobjects. A good team flags those gaps before the import starts, not after. Starting the data audit early and resolving quality issues before the migration runs is the most reliable way to stay on schedule.

4. Which Data Types Will You Migrate, and Which Cannot Be Transferred?

Honest agencies tell you what does not move before you ask. Products, variants, collections, customers, historical orders, blog posts, pages, and URL redirects all transfer through a migration app or a partner-led move, and services typically preserve 85 to 95 percent of structured data. Customer passwords and saved payment methods never transfer because of security and PCI compliance rules, so customers reset passwords through Shopify’s account invite flow at launch. Historical orders usually arrive as read-only records, and platform-native analytics history does not carry across, so plan for that gap before cutover.

5. How Will You Protect SEO Rankings and URL Structure?

SEO is the line item where cutting costs hurts the most. Shopify enforces fixed paths like /products/ and /collections/, so almost every URL changes, and a strong agency benchmarks current rankings, preserves title tags, H1s, and meta descriptions, and rebuilds structured data. Expect a short ranking wobble after launch, with smaller sites usually settling within a few weeks and large catalogs taking a couple of months to stabilize. A weak answer treats SEO as a step to handle later, which is how stores lose 30 to 50 percent of organic traffic.

6. How Will You Plan, Build, and Test 301 Redirects?

Redirects are the single biggest factor in whether traffic holds. A strong agency crawls every old URL and maps each one directly to its new Shopify counterpart in a reviewed spreadsheet. They use 301 redirects, not 302s, since a 301 tells search engines the move is permanent and passes nearly all of the page’s ranking power to the new URL. They avoid redirect chains, where one old URL hops through an intermediate before reaching the final page, since each hop adds latency and dilutes value. Redirects load in the Shopify admin under Online Store, then Navigation, then URL Redirects, with top collections, best sellers, and high-traffic blog posts prioritized first. After launch, the team submits the sitemap at /sitemap.xml to Google Search Console and watches the coverage report to catch any 404s.

7. How Will You Handle Apps, Integrations, and Custom Workflows?

Your current apps and plugins do not move to Shopify, so each one needs a decision. A strong agency audits every integration, then recreates custom logic using Shopify apps, custom app development, or Shopify Functions, and rewires connections to systems like your ERP, CRM, WMS, or PIM. Be ready for app spend to rise, since a stack that costs around $200 a month in plugins can run $500 to $1,000 a month in Shopify apps. Launch with mission-critical systems such as ERP, fulfillment, and payments on day one, then phase in secondary marketing tools later.

8. How Will You Rebuild the Theme, Design, and UX?

Design does not transfer between platforms, since Shopify storefronts are built in the Liquid templating language, which means a full rebuild is required. A strong agency confirms whether you want a faithful rebuild of your current design or a refresh, then keeps your highest-converting layouts, such as product and collection templates, intact. They test the build on a password-protected staging store that runs in parallel while your old store keeps taking live orders. Ask whether they start from a premium theme or build custom, since that choice swings cost from a few thousand dollars to $30,000 or more.

Questions 9 to 15: Launch, Support, and Ownership

9. How Will You Set Up and Test Checkout, Payments, Shipping, and Tax?

Checkout errors block revenue from the first minute, so this area needs real test orders. A strong agency runs test transactions with real credit cards, Apple Pay, and PayPal, and verifies that funds are captured and refunded correctly. They confirm real-time carrier shipping rates calculate correctly by weight, dimensions, and region. Tax rules get the same treatment, verified for every market you sell into If you keep a third-party gateway instead of Shopify Payments, ask them to factor in Shopify’s extra surcharge of roughly 0.20 percent per transaction on top of your gateway’s own fees.

10. How Will You Rebuild Tracking, Analytics, and Pixels?

Broken tracking hides problems until revenue has already dropped, so analytics need a full rebuild. A strong agency sets up GA4, Google Search Console, the Meta pixel, and any conversion tags, then fires test events to confirm purchases, add-to-cart, and checkout steps report correctly. They know platform-native analytics typically do not transfer, though third-party data such as Google Analytics is unaffected, so historical reports get preserved separately before the cutover. Confirm who owns the GA4 and Search Console properties, since those should sit on your accounts.

11. What Does Your QA Process Cover Before Launch?

QA separates a finished migration from a correct one. A strong agency runs several dry-run imports in an isolated environment, then reconciles the data against the legacy source to find edge cases. They deliberately test the hardest records: high-variant products near Shopify’s limits, messy orders with partial refunds, split shipments, and multiple discount codes, and high-value VIP or wholesale customers with their tags and tax-exempt status. The team clicks the full customer journey, from browsing to checkout, across devices and browsers. Ask for a sample QA checklist, since a real one runs long.

12. What Does Your Launch-Day and Cutover Plan Look Like?

A calm launch follows a written plan, not improvisation. A strong agency keeps your old store live while building Shopify in parallel, then runs a final delta migration to capture any orders and customers created during the build before pointing your domain over. DNS propagation takes a few hours, and a clean cutover means customers transition without ever seeing a downtime screen. The plan should name a content freeze, a go-live order of steps, and clear rollback steps if something fails. Avoid scheduling the move within 90 days of peak season, since migrating in October for a December peak is how brands lose Q4.

13. What Post-Launch Support Do You Provide, and for How Long?

Most issues surface in the first few weeks, not on launch day, so support windows matter. A strong agency watches Search Console and rankings closely while Google recrawls and reassigns equity to the new URLs. They offer a defined support period with an agreed response time, and some brands keep a retainer or hire Shopify developer support for ongoing fixes. Ask exactly what is covered, for how long, and how fast they respond when something breaks.

14. Who Owns the Code, Theme Files, Accounts, and Documentation?

Ownership decides how free you are after launch. A strong agency builds on your Shopify account and hands over theme files, custom code, and documentation at the end. Your domain, . payment gateway, GA4, and Search Console stay in your name throughout, not theirs Confirm this in writing before work starts, since assets locked on an agency account become a problem the day you want to switch partners. Clear ownership terms are a sign of a confident, honest team.

15. How Do You Price the Migration, and How Are Scope Changes Handled?

Pricing clarity prevents the disputes that derail projects. Specialist agency migrations commonly run from $10,000 to $50,000. Enterprise Shopify Plus projects start near $50,000 and climb from there. Theme and custom development together often make up roughly half of the total budget. A strong agency gives an itemized quote, names what is excluded, uses a written change-order process, and budgets a 15 to 20 percent contingency for data cleanup or surprises. Watch for a single lump-sum number with no breakdown, since that is where hidden costs hide.

Strong and Weak Answers Side by Side

This table shows the signals to listen for across vetting areas. Weak answers across several rows are a warning sign.

Vetting Area	Strong Agency Answer	Weak Agency Answer
Platform experience	Names platform, recent migrations	General claims, no examples
Data scope	Lists products, orders, metadata	Says all moves, no detail
SEO migration	Benchmarks rankings, index checks	SEO as an afterthought
Redirect mapping	Maps old URLs, reviewed	Bulk-redirects to homepage
App replacement	Audits apps, native swaps	Assumes apps move unchanged
Integration planning	Documents ERP, CRM early	Integrations left to launch
Checkout setup	Configures, test-orders settings	Copies settings, no test
Tracking validation	Rebuilds GA4, pixels, events	Skips analytics until drops
QA process	Tests the customer and developer	Quick visual check only
Post-launch support	Response window and SLA	Ends contact at go-live
Ownership and docs	Hands over code, docs	Keeps assets on the agency
Pricing clarity	Quotes scope and changes	One number, no breakdown

Agency Comparison Scorecard

Score each agency from 1 to 5 below, then total them. Note proof beside each score, since evidence matters.

Evaluation Area	Score 1 to 5	Notes
Source platform experience	____	____
Catalog complexity handling	____	____
SEO migration process	____	____
Data validation	____	____
Integrations	____	____
Checkout and tracking	____	____
QA depth	____	____
Launch support	____	____
Post-launch support	____	____
Pricing clarity	____	____
Proof and case studies	____	____

Read each score with its proof, then shortlist the top two and compare proposals.

Migration Readiness Checklist Before You Sign

Readiness on your side makes every agency answer sharper. Walk through each item before approving a proposal or setting a date.

• Current platform and pain points are documented in one brief.

• Product, customer, order, and content data listed with rough counts.

• Top organic pages exported from Analytics and Search Console.

• Redirect map prepared from your old URL crawl.

• Required apps and integrations listed with their purpose.

• Checkout, payment, tax, and shipping rules are documented.

• Analytics, pixels, and key events reviewed and named.

• Launch date and content freeze period planned with the team.

• Post-launch QA owner assigned on your side.

• Agency proposal reviewed against all 15 questions above.

This list doubles as your Shopify migration readiness baseline. Ask each candidate how they would handle every line to reveal process depth.

Proof and Documentation to Request

Proof turns claims into facts you can verify before money changes hands. Ask for samples that match your platform and catalog.

• Case studies with results from similar migrations.

• Examples from the same source platform as yours.

• A sample migration plan or project timeline.

• A data mapping sample showing fields and validation.

• An SEO redirect sample with old-to-new URL mapping.

• A QA checklist sample used before launch.

• A launch plan sample with freeze and rollback steps.

• Ownership and documentation terms in writing.

• A support SLA or post-launch response plan.

Agencies that share these freely tend to run tighter projects. Strong Shopify migration support appears in documents before launch.

Does the Cheapest or Priciest Agency Win?

Price alone is a poor quality signal either way. The cheapest quote is not always the weakest, nor the priciest the strongest. What actually predicts a smooth migration is the quality of their process, the depth of their proof, and how they handle problems when things go off-plan. An agency charging mid-market rates with ten documented migrations beats a premium agency with a polished pitch and no case studies every time. Judge on evidence, not the number on the invoice.

How CartCoders Approaches Shopify Migrations

Migration goes smoothly when planning, data, SEO, and QA move together. CartCoders helps brands with migration planning, data migration, SEO-safe redirects, app and integration mapping, launch QA, and post-launch support.

Grade your own readiness first, then bring it to any candidate before you sign. Run through the Migration Readiness Checklist and a post-launch Shopify CRO audit to keep conversion steady after the move.

Final Word on Choosing Your Partner

Choosing a migration partner is the decision that protects everything you have built, or quietly puts it at risk. The platform rarely fails. The partner running it usually decides the outcome.

So treat selection as its own project. Ask the 15 questions, score each candidate on the same areas, and request proof before you sign. Strong partners answer with examples and samples, while weak ones stay vague and lean on promises.

The agency with steady answers, clean redirects, and case studies gives you the calmest path to Shopify. Choose on evidence, and the move becomes a step forward.

Frequently Asked Questions

These short answers cover what store owners ask most. Use them alongside the 15 questions and scorecard above.