Replatforming is one of the riskiest things you can do to a working store. Get it right and you unlock better performance, lower costs or features you'd outgrown. Get it wrong and you lose rankings you spent years earning, orphan customer data, or push live a checkout that quietly breaks. The difference between those outcomes is almost entirely planning. Here's how to migrate without the disaster.
First, be sure you should migrate at all
Migration is worth it when your current platform genuinely holds you back — capped features, runaway costs, poor performance, or a system you've simply outgrown. It's not worth it to chase a shinier logo. Before you commit, confirm the new platform solves your real problems; our platform comparison guides can help you weigh the options honestly. A migration you didn't need is all risk and no reward.
Protect your SEO above all
The most common migration disaster is a collapse in organic traffic, and it's almost always caused by URLs. When pages move or change address, Google and your customers hit dead links unless you redirect them. So before launch:
- Map every old URL to its equivalent on the new platform.
- Set up 301 redirects so both search engines and shoppers land in the right place.
- Preserve page structure — keep titles, headings and content intact where you can.
- Keep your product and category content rather than starting from blank pages.
This is fiddly, high-stakes work, and it's where an experienced SEO agency earns its fee by safeguarding the traffic you've built.
Move your data carefully
Your store is full of data that matters: products, images, customer accounts, order history and reviews. Plan exactly what moves and how. Test the import on a staging site, check that prices, stock levels and variants come across correctly, and verify that customer accounts and past orders are intact. Data loss erodes trust fast, so treat this as carefully as the redirects.
Test everything before you go live
Never switch a live store to a new platform on faith. Build and test on a staging environment first, then check the things that directly affect revenue:
- The full checkout, with a real test payment end to end.
- Every payment method and shipping option.
- Mobile experience and page speed.
- Search, filtering and key product pages.
- Integrations — accounting, fulfilment, email.
Only when it all works should you go live, ideally during a quieter trading period so any teething issues hit fewer orders.
Watch closely after launch
The job isn't done at go-live. For the following weeks, monitor your rankings, organic traffic, conversion rate and error logs. Catch broken redirects, missing pages or checkout glitches early, while they're cheap to fix. A quick post-launch dip is normal; a sustained slide means something needs attention now, not next month.
Migrations reward expertise, and the cost of doing one badly dwarfs the cost of doing it well. If you're planning to replatform, browse vetted UK studios in our ecommerce developers directory and choose one with a proven, low-risk migration process.