Prefab Dealer and Contractor Portals: Align HubSpot Buyer Records With Supabase Project Access

What this looks like in modular and prefab building supply and installation

A prefab supplier sells through a dealer while coordinating delivery with a local installation contractor. The end customer wants progress visibility, the contractor needs logistics documents, and the dealer owns the commercial conversation. HubSpot contains all three relationships. If the portal grants access to anyone associated with the deal, it may expose dealer pricing or permit the wrong party to approve a change. Explicit role assignments avoid that ambiguity.

Records, ownership, and update rules

Work through the process

1. 01
   Define the role matrix

   List what each party may view, submit and approve. A contractor may need delivery details without seeing dealer margin, while an end customer may need progress without editing logistics instructions. Use the actual commercial relationship to design permissions rather than a generic all-contacts access rule.
2. 02
   Connect stable project relationships

   Join HubSpot companies, contacts and deals to the portal's project keys through approved cross-references. Keep a user identity separate from the CRM contact record. A contact merge or email correction should not silently grant access to another company's projects.
3. 03
   Publish a deliberate field set

   Choose the milestone and document context each role needs. Keep internal pricing and restricted notes outside broad portal summaries. Mark forecast dates separately from confirmed events so the portal does not transform a tentative factory schedule into a customer promise.
4. 04
   Enforce grants and row policies

   Use Supabase access controls for the role and project memberships, and test allowed and denied operations. Keep privileged connection credentials server-side. Verify document access as well as table rows; a hidden portal link is not sufficient authorization for the underlying resource.
5. 05
   Review requests before operational changes

   A dealer or contractor may propose a date, contact or scope change through the portal. Store the submission and route it to the appropriate owner. Return a clear received, under review or accepted state, and only publish the official project change after the authorized process confirms it.
6. 06
   Review invitations when commercial roles change

   A dealer's employee leaving the project or a contractor being replaced should trigger a review of explicit portal membership. Updating the HubSpot contact owner does not by itself define the appropriate access change. Keep the invitation, role assignment and removal decision in the application process. Retain prior submissions as project history while preventing a former participant from continuing to view new documents or propose operational changes.

Handle the exceptions explicitly

Dealer represents several end customers

Keep project memberships and commercial visibility scoped to the approved relationship.

Contractor is replaced during delivery planning

Update explicit permissions and preserve the historical submissions from the prior contractor.

User requests a scope change

Route it for review rather than allowing a portal edit to change the released configuration.

What to verify before expanding

• Dealer pricing is visible only to authorized roles.
• A CRM association alone cannot grant project access.
• Portal requests remain distinct from approved changes.
• Replacing a contractor changes access without deleting history.

Technical references

• Stacksync HubSpot connector and object support
• Stacksync Supabase connection setup
• Supabase row level security