What are the most common things that go wrong during a HubSpot website migration?

The most common migration failures are broken URL redirects that tank organic traffic, missing metadata (titles, descriptions, alt text) that weakens search rankings, incomplete content inventory that leaves pages behind, and tracking code gaps that break analytics and attribution after launch.

Redirect errors cause the most visible damage. If your redirect map has gaps or incorrect destinations, Google treats moved pages as lost content and drops their rankings. This shows up as a sudden traffic cliff within the first week after launch. The second common issue is data duplication during CRM migration, where contact records merge incorrectly or create duplicates that corrupt reporting and trigger wrong automation sequences. Third, teams often underestimate the scope of content that needs migrating. Pages buried in subdirectories, orphaned landing pages, and resource PDFs get missed in the initial audit and only surface when someone clicks a dead link after go-live. Fourth, tracking and analytics breaks happen when the HubSpot tracking code, Google Tag Manager tags, or conversion pixels are not reinstalled on the new templates. Building a staging environment and running a parallel test migration before the real cutover catches most of these issues. Post-launch, a dedicated monitoring period of at least two weeks helps identify problems before they compound.