Shopify Migration Timeline UK (2026)

I’ve been building ecommerce stores for 27 years and running migrations as a structured, repeatable process. The two-week migration isn’t aggressive scheduling — it’s the natural pace when product imports run through the Shopify Admin API, redirect maps push in bulk, and theme work happens via Shopify CLI in version-controlled code rather than in admin screens. Most agency migrations take 6-12 weeks because that’s what the agency operating model can sustain, not because the work needs that long.

This guide is the day-by-day. Standard 2-week migration laid out hour by hour where it matters, the longer Magento timeline explained, what zero-downtime actually means in practice, and the legitimate reasons a migration takes longer than the standard.

Standard Migration Timeline by Source Platform

Here’s the timeline by source platform.

The two-week migrations are the bulk of UK SMB ecommerce work. Magento timelines stretch because the source data is genuinely richer — configurable products, customer groups, multi-store, deep URL trees — not because the methodology is different.

Week 1: Audit and Build

The first week is silent from your side. The new Shopify store gets built while your existing store keeps trading. You won’t see much customer-facing — that’s intentional. Foundations first.

Day 1 — The Audit

The audit sets up everything that follows:

• Crawl the source site for full URL inventory (every product, every page, every redirect)
• Document the catalogue — product count by type, variant structure, image inventory
• Identify integrations — analytics, ads, email service provider, ERP/OMS if any
• Capture brand assets — logo, colour palette, fonts, photography
• Plugin or extension audit — what each one does, what its Shopify equivalent is
• SEO baseline — current rankings, top-performing pages, metadata structure

The audit becomes the migration plan. Nothing gets left behind because nothing gets missed at this stage.

Day 2-3 — Shopify Store Skeleton

The new store gets provisioned and the structural work happens:

• New Shopify store created on the right plan (Basic, Shopify, Advanced, or Plus)
• Theme selected from the Horizon family (Shopify’s modern theme architecture)
• Brand colours, fonts, header, footer customised to match
• Payment gateways configured — Shopify Payments plus any alternatives your customers use
• Shipping zones and rates set up to match your current shipping cost structure
• Tax configuration — UK VAT, EU VAT if you sell into Europe, digital product rules if applicable
• Apps installed — Klaviyo, reviews, search, anything else identified in the audit

By end of Day 3 the store is structurally ready. No products yet, but the rails are laid.

Day 4 — Phase 0.5 (API and CLI Access)

If access wasn’t pre-configured, this is the day it happens:

• Shopify Admin API token generated (Settings → Apps and sales channels → Develop apps)
• Smoke test run via python src/scripts/shopify_smoke.py — confirms shop, products, and publications all return 200
• Shopify CLI logged in via shopify login --store <slug>.myshopify.com
• Theme work moves to version-controlled code: shopify theme dev for live preview, shopify theme push/pull for deploy

Without Phase 0.5, the rest of the work falls back to admin clicks and the timeline slips. With it, Days 5-14 happen at API speed.

Day 5-6 — Theme Refinement and Content Pages

Customer-facing pages get built:

• Homepage layout, hero, featured collections, navigation
• About, Contact, Shipping, Returns, Privacy, Terms
• Email templates (order confirmation, shipping, abandoned cart) branded to match
• Mobile experience tested on real devices, not just browser DevTools
• Schema and structured data validated

Day 7 — Integrations

The connections get wired:

• Klaviyo connected and existing flows mapped to new triggers
• Google Analytics 4 with conversion goals configured
• Google Ads and Merchant Centre linked, feed configured
• Facebook Pixel and any other ad pixels
• Customer review apps with existing reviews imported where possible

End of Week 1: Shopify store is structurally complete and ready for data.

Week 2: Data, Redirects, Cutover

The second week is the migration itself. This is where the API/CLI advantage shows up most clearly — what would be a week of admin clicks becomes a few hours of structured imports.

Day 8-9 — Product Data Migration

Programmatic product import via Shopify Admin API:

• Products exported from source platform in structured format
• Variant structures, options, attribute sets mapped to Shopify variants
• Product images pulled from source CDN, re-uploaded to Shopify
• Inventory levels, SKUs, weights, barcodes verified
• Collections built (smart or manual based on source category structure)
• Verification scripts run to confirm every product imported correctly

For context: a recent wellness ecommerce migration ran 96 products with 102 variants, 176 images, and 4 variant family consolidations in 36 minutes — extraction, conversion, test import and full import. The same work via admin clicks would have been a full day. That difference is what compresses Week 2 into a few days of substantive work plus testing.

Day 10 — Customer and Order Data

• Customer accounts imported with order history preserved
• Historical orders imported for analytics continuity and customer service reference
• Customer tags applied to mirror source platform customer groups (or B2B catalogues on Plus)
• Verification — counts match, totals reconcile, accounts can log in

Customers will need to set a new password on first login (security restriction on password migration), but their order history and stored details remain.

Day 11 — Content and Redirects

The most labour-intensive day, and the one where corners get cut:

• Blog posts migrated where applicable
• Static pages (About, Shipping, Returns, etc.) finalised with content from source
• 301 redirect map built from the URL crawl — every source URL mapped to its Shopify equivalent
• Redirect map pushed to Shopify in bulk via API (not pasted one at a time)
• Existing redirect plugin rules from the source site lifted across

The redirect map is where SEO equity survives or dies — I’ve covered the full migration SEO picture separately. Done programmatically, every URL is mapped. Done manually, the long-tail pages get missed.

Day 12 — Full Testing

Nothing goes live until everything passes:

• Every product type — simple, configurable, bundle, grouped, virtual, downloadable (whichever apply)
• Checkout flow — add to cart, shipping calculation, payment processing, order confirmation, post-purchase email
• Customer accounts — login, password reset, order history, saved addresses
• Mobile experience — full checkout on phone and tablet
• Redirects — sample test of source URLs resolving correctly to Shopify equivalents
• Payment processing — live test transaction at low value, refund process verified
• Email notifications — every transactional email triggers and renders correctly
• Schema and SEO — structured data validates, sitemap submits, robots.txt allows what it should

Some of this runs as automated smoke tests (URL crawls verifying 200 responses and canonical correctness). The merchant-facing tests are manual.

Day 13 — Merchant Review and Sign-Off

• Full walkthrough with you on the new store
• Any outstanding adjustments captured and addressed
• Final pricing, copy, and visual checks
• DNS switch scheduled (usually for off-peak hours the next morning)
• Full export of the source site taken — content, products, customers, redirects — so nothing depends on the old platform staying alive

This is your last chance to flag anything. After tomorrow, the new store is the customer-facing one.

Day 14 — Cutover

The switch itself is fast and undramatic:

• DNS A record (or CNAME) pointed at Shopify
• Propagation: minutes for most ISPs, hours for full global propagation
• Sitemap submitted to Google Search Console
• Monitoring scripts run for the first hour
• 30-day post-launch support clock starts

Before cutover I take a full export of the old site — content, products, customers, redirects — so nothing depends on the old platform staying alive. Whether the old subscription stays active after launch is your call and your platform’s; the export is mine, and it means nothing is lost either way.

Why 2 Weeks Is Achievable

Two weeks isn’t aggressive — it’s what the work actually takes when the operational layer is API-driven instead of admin-click-driven.

• Programmatic product import — minutes instead of days. The 36-minute import I mentioned above versus a full day of clicking is the difference between Day 8-9 being “imports complete with verification” and “still importing on Day 12”
• Bulk redirect mapping — every URL pushed in one API call. Manual entry one at a time, in admin, takes hours per hundred URLs. Larger source sites have thousands of URLs
• Theme work in version-controlled code — shopify theme dev for instant preview, shopify theme push for deploy, theme files in git. Mistakes are reversible, changes are reviewable, deploys are tracked
• Verification as code — smoke tests that hit every critical URL, validate canonicals, check structured data, confirm 200 responses on the sitemap. Run before launch, run after launch, catch regressions agencies discover via customer complaints
• No layered handoffs — the person doing the work is the person you’re talking to. No account manager translating to a project manager translating to a developer. Decisions happen in seconds; questions get answered in the same session they’re raised

The combined effect: Week 1 is genuinely 7 days of focused work, not 7 elapsed days waiting for slots in a developer’s calendar. Week 2 is genuinely 7 days of execution, not 7 days of waiting for sign-off cycles.

Why Other Agencies Quote 6-12 Weeks

The longer timelines you’ll see quoted aren’t padding for the sake of it (mostly). They reflect a different operating model:

• Account management overhead — somebody to be your point of contact, who isn’t doing the work, adds days to every decision cycle
• Project management coordination — translating between you, the account manager, and the developer adds another layer
• Sign-off cycles — discovery sign-off, design sign-off, build sign-off, UAT sign-off. Each one is a calendar week
• Hourly billing model — when the agency bills by the hour, the timeline benefits from being longer. Not deliberately, but structurally
• Click-by-click work — without API tooling, product import, redirect mapping, and theme deploys all happen at human speed
• Multi-developer handoffs — the front-end developer hands to the back-end developer hands to the QA tester hands to the deployment engineer. Each handoff is a delay
• Calendar fragmentation — 40 hours of work spread across 6 weeks of slot availability, not 40 hours done in 2 weeks of focused work

If you’re being quoted 8 weeks for a Wix migration, the question isn’t “is the work harder than I thought?” — it’s “what’s the operating model that makes this take this long?”

What Can Legitimately Extend the Timeline

The 2-week timeline assumes a typical Wix, EKM, WordPress, or WooCommerce migration. Magento timelines stretch for genuine reasons (covered in the Magento to Shopify guide). Beyond that, here’s what can legitimately extend any migration:

• Custom integrations — bespoke ERP, OMS, fulfilment system connections that need bridging rather than replacing
• Complex B2B requirements — multi-tier pricing, customer-specific catalogues, quote workflows beyond Shopify Plus’s native capabilities
• Multi-store consolidation — collapsing several source storefronts into one Shopify store, or migrating to expansion stores
• Very large catalogues — 5,000+ SKUs with complex variant structures
• Custom theme work — not customising a Shopify theme but building one from scratch (a separate engagement, separate quote)
• Content rewrites — migration moves content as-is; rewriting product descriptions, blog posts, or marketing copy is a separate scope
• Phased launches — going live on category at a time, brand at a time, geography at a time

Each of these gets flagged at quote stage with a revised timeline. You’ll know before you commit, not after.

What Zero-Downtime Actually Looks Like

The “zero downtime” promise is real but worth being specific about.

What stays live throughout:

• Your source site — accepting orders, processing payments, fulfilling normally
• All existing email flows, customer accounts, order history
• Your phone number, your email address, every other channel customers reach you on

What happens at cutover (Day 14):

• DNS update — your domain points at Shopify instead of the source platform
• Propagation — most customers are hitting the new site within 15 minutes; full global propagation in hours
• The transition window — for the period DNS is propagating, some customers see the source site, others see the new Shopify store. Both are functional. Orders placed on either are valid

What happens after cutover:

• Shopify is the customer-facing store
• The pre-cutover export — content, products, customers, redirects — means nothing depends on the old platform staying alive; whether the old subscription stays active is your call and your platform’s
• Any orders that came in just before the switch get handled on whichever platform they were placed
• Email flows continue uninterrupted (Klaviyo or whichever ESP, connected to both stores during the switchover)
• 301 redirects route old URLs to new Shopify equivalents

The bit worth flagging: there’s a small window (usually 15-60 minutes) where some customers might briefly see the source site after the DNS flip while their ISP’s cache catches up. That’s not downtime — both stores are working — but it’s worth knowing about. After that window, traffic consolidates on Shopify and the source platform serves only customers with cached DNS, which fades to zero within 24-48 hours.

Post-Launch: 30 Days of Monitoring

The migration doesn’t end at cutover. The 30 days after are where rankings hold or drop, and where any missed issues surface.

Before the domain moves I record where you rank, so there’s a baseline to hold the migration to. Through launch week I check Search Console daily — crawl errors, coverage, any URL that has stopped resolving — and I re-check your tracked rankings against that baseline at the end of the first month. You get the before-and-after in writing. Anything that has slipped because of the move gets fixed without an additional invoice.

Week 1 post-launch (Days 15-21):

• Daily Search Console checks — crawl errors, coverage, any URL that has stopped resolving
• Daily redirect spot-checks
• Daily order monitoring (volume, completion rate, payment failures)
• Customer complaint triage (none ideally, but watch)
• Schema and sitemap re-validation

Weeks 2-4 post-launch (Days 22-44):

• Weekly traffic comparison vs pre-launch baseline
• Weekly Search Console review for crawl errors, indexing issues
• Tracked rankings re-checked against the pre-migration baseline at the end of the first month, with the before-and-after in writing
• Outstanding fixes addressed without additional invoice

Day 44:

• Old platform subscription: your call whether it stays or goes — the export means nothing is lost either way
• Final post-launch report
• Handover for ongoing optimisation, if applicable

If anything is genuinely off — rankings haven’t recovered, traffic is down meaningfully, customers are complaining about something repeatable — that’s the trigger for a deeper investigation, not “send another invoice.”

Ready to Start the Clock?

The clock is two weeks of build once I have full access, and it starts the day access is fully gathered. Elapsed time depends on how fast that access arrives and how quickly you turn round the reviews; the dated schedule you get at quote stage says which dates are mine and which are yours. Faster turnarounds happen when access is ready on day one.

Get in touch and I’ll give you a fixed price within 24 hours, an audit within 48, and a kick-off date within the same working week.

If you want the parallel pricing picture, the Shopify Migration Cost UK 2026 guide breaks down what each timeline tier actually costs and why some agencies quote far higher.

If you want the platform-specific detail before committing:

• Wix to Shopify Migration Guide
• EKM to Shopify Migration Guide
• WordPress to Shopify Migration Guide
• Magento to Shopify Migration Guide

The methodology is the same across all of them. The build holds at two weeks for the first three. Magento takes longer for reasons the Magento guide explains. Either way: a fixed build window, a fixed price, and a dated schedule that says which dates are mine and which are yours.