Most CRM migrations don't fail during the import — they fail weeks later, when sales stops trusting the data. Duplicate companies, broken deal associations, and half-empty contact records erode confidence fast, and once a team routes around the CRM you have lost the project regardless of how clean the technical cutover was.
The work that prevents this happens before a single record moves. This checklist walks through the preparation, mapping, and validation steps we run on every migration into HubSpot — in the order we run them.
A migration is only as good as the data you feed it. The importer will faithfully reproduce every duplicate, typo, and orphaned record you hand it.
Before touching HubSpot, get clear answers to four questions:
Most CRM migrations don't fail during the import — they fail weeks later, when sales stops trusting the data. Duplicate companies, broken deal associations, and half-empty contact records erode confidence fast, and once a team routes around the CRM you have lost the project regardless of how clean the technical cutover was.
The work that prevents this happens before a single record moves. This checklist walks through the preparation, mapping, and validation steps we run on every migration into HubSpot — in the order we run them.
A migration is only as good as the data you feed it. The importer will faithfully reproduce every duplicate, typo, and orphaned record you hand it.
Before touching HubSpot, get clear answers to four questions:
Mapping is where most of the thinking happens. HubSpot's core objects — Contacts, Companies, Deals, and Tickets — rarely line up one-to-one with a legacy schema, so you decide deliberately what becomes a standard property, what becomes a custom property, and what gets left behind.
Work through mapping in this order:
Document the mapping in a shared sheet before you build anything in HubSpot. It becomes both your import spec and your QA checklist.
Never trust a full import on the first pass. Run a representative test batch — 50 to 100 records that include your trickiest cases — and check it end to end before loading everything.
If the test batch is clean, the full load is boring. If it is not, you just saved yourself from importing the same mistake ten thousand times.
Once the full load is verified, lock the source system to read-only to prevent drift, communicate the cutover date to the team, and schedule a data-quality review two weeks in. Migration is the start of a clean CRM, not the finish line.
Need the mapping and cutover handled end to end? See our HubSpot migration service for how a done-for-you migration works.
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