When a website migration goes wrong, most people focus on the immediate 404 errors or the unmapped links. At The Structured Data Company, we see a much more invisible – and often more damaging – failure – the total collapse of your brand entity.
A migration isn’t just about moving files; it’s about maintaining Google’s understanding of who you are. If you don’t treat your brand entity as the priority, you’re not just moving house; you’re essentially deleting your digital identity.
Here are the biggest migration problems we see:
1. The Entity Reset (When Google Forgets Who You Are)
This is the most common disaster. You might have a perfectly designed site, with solid 301 redirects, but if your Organization structured data and brand trust signals aren’t carried over by the developer (or updated to reflect a merger), Google’s Knowledge Graph loses the connection.
Unfortunately, we see this a lot. A developer builds a beautiful new site, but they forget that the old site had thousands of lines of bespoke, hand-coded JSON-LD. Worse still, is when the developer pushes your brand new site live with a generic plugin when changing CMS, leaving you with generic (often wrong) markup, which wipes out your brand identity. Trust signals such as semantic triples, reviews, badges and external links are sometimes lost in the redesign.
Your Rich Results vanish overnight. Topical clusters are destroyed by changes in URL structure and internal linking hierarchies are ruined by the keep / kill / combine audit.
Suddenly, you aren’t “The Leading UK Expert in X” anymore, you’re just a new website with no history. This results in the loss of your Knowledge Panel and a sudden drop in brand authority scores, which can take months – or even years – to rebuild.
2. The Merger Mystery
If you are merging Brand A into Brand B, you can’t just 301 redirect the homepage and hope for the best. Without specific subOrganization or dissolutionDate markup, Google gets confused. There’s too much ambiguity. What happened to Brand A?
It might continue to show the old brand name in search results for months because it doesn’t “know” the entity has been absorbed.
You might have done the change of address tool, but that means nothing when it comes to brand entities. All of those unlinked brand mentions out there on the web? What happens to those? They are just lost in the wilderness and don’t pass authority or trust through to your brand anymore.
If you don’t explicitly tell search engines that you’ve merged, then they have to guess, which is not great for your brand entity. It’s a good idea to check both brand entities before you even think about merging – that includes relevancy scores, legal names, brand mentions, AI’s view of the brand, which you can do with a tool such as Entity Scout.
3. CMS Changes and the URL Butterfly Effect
Moving from something like WordPress to Shopify or a bespoke build usually involves a total change in URL structure. Even with a redirect map, every URL change forces Google to “re-evaluate” the page. Is it still relevant? Is the page still topically strong? How’s the internal linking? Is there still a topical cluster?
If your new CMS changes your folder structure (e.g., moving /blog/seo-tips to /articles/seo-tips), you risk “leaking” the authority that page has built up. This loss of topical authority can seriously hurt your rankings.
Many website owners take the opportunity of a website migration to completely redesign their pages and rewrite their content. This can be really risky, and at an absolute minimum, you need a traffic risk analysis before you even think about a keep / kill / combine. From my 17 years of SEO experience, I’ve learnt the hard way that it’s best to keep URL structures (and the content on the page) as similar as possible during a migration to help preserve the authority.
During a migration we need to signal to Google that the expertise hasn’t moved, only the address has.
Why The Traffic Drop Actually Happens
Most post-migration traffic drops aren’t actually about the redirects, they are about a loss of understanding. If Google’s fishing monster (the error it returns when an entity ID is deleted) shows up for your brand, your organic traffic will tank because you’ve lost your brand authority and very likely your entity home.
This is why we treat migrations as a crucial SEO task. We need to be involved from the very beginning, even if that means a year before the go live date.
You have to treat your SEO as a core asset, not an afterthought. You’ve spent years building up your brand, why risk everything to save a few quid on a migration?
If you don’t get SEO involvement from day 1, it will cost you far more afterwards, particularly from the loss of trust from Google.
We Do Things Differently
If you haven’t realised by now, we do things differently to other SEO agencies here at The Structured Data Company. You see, we’ve got years of experience with entity SEO, and know that your brand entity is one of your most precious assets. Here’s our top 5 reasons about how we differ from other digital marketing agencies for website migrations:
- We do things in phases – a phased migration is a great idea if you have a large and complex website. This gives search engines and AI time to digest each phase. It’s especially good if you do want to update your content or make URL changes along the way. It’s less of a shock for Google and can lead to much better outcomes.
- We plan, plan, plan – the planning part of a migration is crucial to the success. The more you plan, the better the migration is likely to go.
- We’re realistic – a website migration is always a risk, no matter how small it is. We’re upfront about those risks from the very beginning, and we don’t promise you things which are unlikely to happen, or which we can’t be sure of. We make sure that we are realistic about the timeframes as well.
- We’re entity first – we concentrate on your brand entity, because the technical stuff shouldn’t be a minefield if it’s done right.
- We get involved – we’re happy working with other agencies, developers (even the grumpy ones!), in-house teams, C-Suite, founders, directors, you name it. We know the difference between providing expert guidance and getting in the way. By joining the conversation early, we ensure our recommendations are integrated into your workflow, not added to it. We’ve managed migrations of all scales, so we know exactly how to support your team without overstepping.
Don't let your migration be a mass extinction for your brand
Whether you're doing a simple CMS swap or a complex global brand consolidation, you need a migration partner who understands the semantic web in the age of AI, not just the redirects. Hint - that’s us.
