HubSpot → Attio: a clean workspace from a decade of debt

Most HubSpot instances have accumulated years of exports, imports, merged workflows, dead lifecycle stages, and custom properties nobody remembers creating. Moving to Attio is an opportunity to leave that behind - but only if you migrate thoughtfully. We run HubSpot → Attio migrations as a structured project: audit first, redesign the data model in Attio (don't just copy HubSpot's schema), then migrate in waves with validation at every step. On arrival, your new workspace is 100% duplicate-free and your reporting actually answers the questions you ask it.

Direction

HubSpot → Attio (one-way, full-history migration)

Stack

HubSpot API, Attio API, Python, Dedup layer

The what

What this integration actually does

It moves Contacts, Companies, Deals, associations, activity history, custom properties, and notes from HubSpot to Attio. Workflows get redesigned (HubSpot workflows rarely translate 1:1 - many become cleaner Attio automations; some become n8n jobs). Reports get rebuilt on the new object model. Your team gets trained. The old HubSpot becomes read-only archive.

The how

How we build it

1
Audit HubSpot: which custom properties are still used, which lifecycle stages are real, what's dead weight.
2
Design the Attio data model - do NOT mirror HubSpot's schema. Take the chance to fix it.
3
Build the migration script in Python. Paginated API pulls, normalized transforms, deduped inserts.
4
Run a full dry-run migration into a staging Attio workspace. Validate counts, spot-check records, run your team through the new views.
5
Production migration in a defined window (usually a weekend). Old HubSpot goes read-only; new Attio goes live Monday.
6
Rebuild automations and reports natively in Attio - plus any n8n jobs needed for things Attio automations can't express.
7
Two weeks of post-migration support while the team learns the new system.

Under the hood

What lives inside the pipeline

Duplicate detection with company-name validation (the #1 silent-corruption vector).
Activity history preserved - emails, calls, meetings mapped to Attio activities.
Custom property to Attio field mapping with type coercion.
HubSpot list exports become Attio lists - naming preserved so your team doesn't have to relearn.
Reporting parity: every report you ran in HubSpot gets rebuilt in Attio before go-live.

Hard-earned lessons

What we learned the hard way

Never migrate HubSpot workflows 1:1. Most HubSpot workflows are wallpaper over bad data - in Attio you can express the same logic in half the nodes with cleaner triggers.
Contact-based pricing means HubSpot exports can be unusually expensive on large accounts. Plan the API pull carefully.
Lifecycle stages and lead scores rarely survive the move cleanly. Redesign them, don't port them.
Sales reps will panic about "where did my dashboard go?" in the first week. Rebuild the five dashboards they actually use, before go-live, not after.

Case study

Mid-market B2B SaaS, 40k contacts in HubSpot

Problem

HubSpot Professional was costing more every year, custom objects were only on Enterprise, and the data model had accumulated 6 years of cruft. The team wanted out but was terrified of losing history.

Solution

Four-week migration project. One week audit + redesign, one week build + dry-run, one weekend production cutover, one week hand-holding.

Outcome

Clean Attio workspace on day one. HubSpot bill eliminated. Reporting that actually matches the way the team operates now, not three years ago.

FAQ

Questions we get

For a short window, yes - but not permanently. Dual-running CRMs is a support nightmare. We design a 1-2 week parallel period max.

Attio isn't a marketing platform. Most teams move email to Lemlist/Customer.io/ActiveCampaign and landing pages to Webflow/Framer. We scope that separately.

Freeze window: the weekend of the migration, deal updates go to a shared doc and get replayed into Attio Monday morning. For most teams this is a 48-hour pause.

Depends on volume and complexity - typical range is €8k-€20k. The first call is free; we'll scope it honestly.