A client bringing their own vendor into a project, a developer, a printer, an internal IT team, sounds like a small logistical detail but often becomes a real source of friction. Work that depends on a third party you don't control introduces delays, gaps, and disagreements that are easy to get blamed for even when they're not yours.
Making it work isn't about resisting the arrangement. It's about drawing clear lines before ambiguity has a chance to become blame.
A client's vendor adds a coordination layer, not just another contact
Every additional party in a project adds a handoff point, and every handoff point is a place where something can slip. Treat a client's vendor as a real coordination dependency from the start, not a minor detail to sort out informally as it comes up.
Clarify what's yours and what's theirs, early
Get explicit, in writing, about exactly where your responsibility ends and the other vendor's begins. Without that line drawn clearly, gaps between the two get discovered live, usually at the worst possible moment, and often get attributed to whoever's easier to blame.
In Stelaah, a project's scope can note dependencies on external parties directly, so the boundary between your responsibility and theirs is documented, not just remembered. See how projects works.
Establish one point of contact for the coordination, not many
Coordinating with a third-party vendor through scattered, ad hoc messages multiplies the chance of something getting missed. Establish one clear channel and, ideally, one named person on each side responsible for keeping the two workstreams in sync.
Document handoffs explicitly instead of assuming alignment
"They said they'd handle it" is not the same as confirming what "it" actually is and when it's expected. Document each handoff explicitly, what's being passed, in what format, by when, rather than trusting an informal understanding to hold.
Protect against blame drifting onto you for their vendor's gaps
When the other vendor causes a delay, it's tempting for a client to experience the overall project as behind schedule without distinguishing whose part slipped. Keep a clear, documented record of what was delivered on your end and when, so responsibility stays where it actually belongs.
A simple checklist
If you do nothing else, do these five things:
- Draw the responsibility boundary explicitly, in writing, early on.
- Establish one coordination point, not scattered contact.
- Document every handoff explicitly instead of assuming alignment.
- Keep your own delivery record clear to prevent blame drift.
- Treat the third-party vendor as a real dependency to plan around.
Do that, and a client's own vendor becomes a manageable dependency instead of a recurring source of ambiguity and blame.
Run your client work in one place. Stelaah keeps projects, clients, contracts, and invoices together, with Aria for the busywork.
Start freeWe build Stelaah, the workspace for client work. We write about running teams, agencies, and venues without the busywork.
