Agency Migration Guide
Constant Contact to HubSpot Migration
What actually transfers, what quietly does not, and what has to be rebuilt by hand.
We mapped Constant Contact against HubSpot feature by feature: 35 features, 1 synced object, 6 documented traps and 22 items that have to be rebuilt. The whole map is on this page, ungated.
The PDF is the same reference, formatted to send to a client.
Get The Guide And The Calculator
The full Constant Contact to HubSpot reference as a branded PDF you can send straight to a client, plus the Excel calculator we scope these migrations with: every one of the 35 features as a row, enter your counts, get hours.
Three files: the guide as a PDF, the same guide unbranded in Markdown for your AI tool, and the full Excel effort calculator.
Constant Contact to HubSpot is a low to medium migration, typically 2-4 weeks. Of 35 features we mapped, 27 carry across as they are and 7 land with something lost. The work is not moving records: it is the 22 items nothing moves for you.
Migration Scorecard
- Migration complexity
- Low to medium
- Typical timeline
- 2-4 weeks
- Recommended method
- CSV export/import with data sync for ongoing parallel operation during transition
- Native sync
- Data sync, two way
- Smart transfer
- Not supported
- HubSpot subscription
- Free HubSpot CRM or higher
Feature parity across 35 capabilities
- Maps directly: 27 (77%)
- Maps partially: 7 (20%)
- No equivalent: 1 (3%)
1
Objects synced natively
6
Limitations and traps
22
Manual rebuild items
3
Source editions covered
Where this comes from: Our own research corpus, verified 2026-07-31, behind every number on this page.
The One Object That Syncs Natively
What the connector moves for you, and which way each one flows.
Contacts/Subscribers
Two wayBecomes Contacts
Two-way contact sync with default field mappings. Custom mappings available with Data Hub Starter+. Historical sync of existing records on initial connection.
Six Things the Sync Does Not Tell You
Each one is documented, and each one has ended a migration in a bad week.
Multi-value Properties Cannot Sync
Properties with multiple values (emails, phone numbers, addresses with home/work/other labels) cannot be synced in custom mappings.
Workaround: Map only the primary value for each field type.
Certain Custom Property Types Excluded
Drop-down, radio select, and checkbox property types from Constant Contact cannot be synced.
Workaround: Recreate as single-line text properties or use a middleware tool like Zapier for transformation.
List-level Sync Not Supported
The native data sync does not map contacts to specific Constant Contact lists. Contacts sync but are not assigned to any particular list in the destination system.
Workaround: Use Outfunnel or Zapier to sync HubSpot lists to specific Constant Contact lists.
Campaign Activity/engagement Does Not Sync
Email opens, clicks, bounces, unsubscribes, and other campaign engagement metrics from Constant Contact do not sync to HubSpot contact timelines.
Workaround: Export engagement reports from Constant Contact manually and import as contact properties, or use a third-party integration that supports event sync.
Historical Campaign Data Cannot Be Migrated
Past email campaign performance data (send history, A/B test results, campaign reporting) cannot be imported into HubSpot. Page views, form submissions, and marketing email metrics are not transferable.
Workaround: Document key insights from historical campaigns manually before migration. Export Constant Contact reports as CSV for offline reference.
Custom Field Mappings Require Data Hub
Default field mappings are provided for free, but creating custom field mappings requires HubSpot Data Hub Starter or Professional subscription.
Workaround: Use default mappings or upgrade to Data Hub Starter.
One Constant Contact Feature HubSpot Cannot Replace
Not a workaround away. If a client depends on one of these, it belongs in the conversation before the contract.
Logo Maker
HubSpot has no logo creation tool. Use Canva or other design tools.
The 22 Items That Get Rebuilt by Hand
This is the list that separates a quote that holds from one that does not.
Data And Objects
Contact Lists and Segments Must Be Recreated in HubSpot Using Active or Static Lists
Tags and Custom Categories Need Mapping to HubSpot Contact Properties
Suppression/opt-out Lists Must Be Imported Before Sending Any Emails From HubSpot
Contact Engagement History (opens, Clicks) Cannot Be Imported
Automation
All Email Automation Sequences Must Be Rebuilt in HubSpot Workflows
Autoresponders and Drip Campaigns Require Manual Recreation
Event-triggered Automations (birthday, Anniversary Emails) Need Rebuilding
Welcome Series and Onboarding Sequences Must Be Recreated
Reporting
Campaign Performance Reports Do Not Transfer
A/B Test Results and Historical Insights Lost
Custom Dashboards Must Be Rebuilt in HubSpot Reporting
Contact Growth and Engagement Trend Data Not Migrated
Sales And Marketing Config
Email Templates Must Be Recreated Using HubSpot's Email Builder (cannot Import Directly)
Landing Pages Require Complete Rebuild in HubSpot Content Hub or Landing Page Tool
Signup Forms Need Recreation as HubSpot Forms or Pop-ups
Social Media Posting Schedules Must Be Reconfigured
Lead Scoring Models Need to Be Built From Scratch in HubSpot
SMS Campaigns (if Used) Require HubSpot SMS Add-on or Third-party Tool
Users And Permissions
User Accounts and Roles Must Be Set up Fresh in HubSpot
Team Structures and Access Permissions Need Reconfiguration
Integrations
Third-party Integrations (Shopify, WooCommerce, Eventbrite, Etc.) Must Be Reconnected via HubSpot Marketplace
Custom API Connections Require Rebuilding
The Sequence
Sync First, Then Migrate
Order is the content here. These are a dependency chain, and running them out of order is a documented way these migrations fail.
- 1
Audit Existing Constant Contact Account
lists, segments, templates, automations, integrations
- 2
Export All Contacts as CSV Including Custom Fields, List Memberships, and Tags
Export all contacts as CSV including custom fields, list memberships, and tags
- 3
Export Opt-out/unsubscribed Contacts and Hard Bounces as a Separate Suppression List
Export opt-out/unsubscribed contacts and hard bounces as a separate suppression list
- 4
Clean Data
remove duplicates, fix formatting, standardize fields
- 5
Import Suppression List Into HubSpot BEFORE Sending Any Marketing Emails
Import suppression list into HubSpot BEFORE sending any marketing emails
- 6
Import Contacts With Proper Field Mapping to HubSpot Properties
Import contacts with proper field mapping to HubSpot properties
- 7
Recreate Lists and Segments Using HubSpot Active Lists
Recreate lists and segments using HubSpot active lists
- 8
Rebuild Email Templates in HubSpot's Drag-and-drop Email Builder
Rebuild email templates in HubSpot's drag-and-drop email builder
- 9
Recreate Automation Workflows in HubSpot Workflows
Recreate automation workflows in HubSpot Workflows
- 10
Rebuild Forms and Landing Pages in HubSpot
Rebuild forms and landing pages in HubSpot
- 11
Configure Email Authentication (SPF, DKIM, DMARC) for Sending Domain
Configure email authentication (SPF, DKIM, DMARC) for sending domain
- 12
Warm Sending Domain
start with most engaged contacts, gradually increase volume over 4-6 weeks
- 13
Monitor Deliverability Metrics Closely During Warm-up Period
Monitor deliverability metrics closely during warm-up period
- 14
Decommission Constant Contact Once HubSpot Is Fully Operational
Decommission Constant Contact once HubSpot is fully operational
Typically 2-4 weeks end to end, depending on how much of the source configuration is actually in use.
Effort Estimator
How Big Is This Migration?
A handful of questions, no email required. The ranges come from the research above: every feature we mapped carries an effort figure, and this adds up the ones that apply to you.
Estimated Effort
Answer a couple of questions and an hours range appears here.
Built from our research on 35 Constant Contact features. It is a range, not a quote.
A planning range, not a quote. It is delivery effort only, with no project management line and no agency markup, so add your own. What moves it most in practice is data quality.
What Goes Wrong Most Often
The failures that show up again and again, in roughly the order they bite.
Forgetting to Import Suppression/opt-out Lists Before First Send, Resulting in Spam Complaints
Forgetting to import suppression/opt-out lists before first send, resulting in spam complaints
Not Warming the Sending Domain Properly, Leading to Deliverability Issues
Not warming the sending domain properly, leading to deliverability issues
Losing Historical Engagement Data That Informed Segmentation Decisions
Losing historical engagement data that informed segmentation decisions
List-level Sync Limitations Causing Contacts to Land in Wrong Segments
List-level sync limitations causing contacts to land in wrong segments
Drop-down and Checkbox Fields From CC Not Syncing to HubSpot
Drop-down and checkbox fields from CC not syncing to HubSpot
Underestimating Time Needed to Rebuild Email Templates (especially Complex Designs)
Underestimating time needed to rebuild email templates (especially complex designs)
Not Configuring SPF/DKIM/DMARC Before Sending From HubSpot
Not configuring SPF/DKIM/DMARC before sending from HubSpot
Questions
Constant Contact To HubSpot, Answered
Yes. Data sync, two way, covering 1 object. What it does not do is rebuild configuration: that is the 22 items below.
Typically 2-4 weeks. Complexity is driven by automation and reporting depth, not by record count: the connector moves records, so a large database is not by itself a long project.
Of 35 features we mapped, 27 (77%) carry across directly and 7 (20%) map partially, meaning something is lost or reshaped. 1 has no HubSpot equivalent at any tier.
22 items have to be rebuilt by hand, and 6 documented limitations are not surfaced by the connector at all. The full list of both is on this page.
Free HubSpot CRM or higher
1: Logo Maker. If a client depends on one, it belongs in the conversation before the contract.
Only in one direction. The sync is not bidirectional here, so a parallel period means picking a system of record and accepting drift in the other.
Ready to get started?
Let's do something great together.
Augment your agency's marketing team's bench with our end-to-end inbound and digital solutions and find out why we're "The HubSpot Agency for HubSpot Agencies."
Fill out this form, and someone from our Solutions team will be in touch with you soon!