Hire fractional HR to build and run onboarding if you need the process created and someone responsible for keeping it moving. If you already have someone who can run it, a setup project may be enough. Those are different things to buy.
While advising an operator on an HR onboarding proposal, I stopped at exactly that distinction:
“It looks like you're building the function, but then you're also going to run it.”
The proposed engagement included both. Build the function, then stay on board month to month to operate it. That was the part worth getting clear before getting lost in the deliverables.
What happens after the setup?
Offer letters, signatures, onboarding kickoff. You can put all of that into a documented process. But a document doesn't tell you who is going to make sure the next person's onboarding actually moves through it.
If that answer is still you, be honest about what you're buying. You're getting a better way to manage the work. You aren't necessarily getting the work off your plate.
There's nothing wrong with that arrangement if it's what you need. The problem is paying for setup while expecting ongoing relief.
So walk through the next hire before you sign. Who starts the process? Who checks what's missing? Who follows up? What decisions still come back to you?
Those questions make the engagement real. They also expose the gap between “we'll give you a process” and “we'll run this for you.”
Buy the responsibility you actually need
A fractional engagement makes sense here when you need recurring ownership of a defined function, without turning it into a full-time position. The operator can build the process around the work they're going to keep handling, rather than hand it back and leave you to figure out the rest.
The proposal should make that responsibility easy to understand. What gets built, what gets handled each month, and what stays with you. If the work eventually moves in-house, agree on what that handoff looks like too.
In that proposal review, the point was simple: “You're taking something off of his plate that he's worried about.”
That's the test. After the process is built, does someone else own running it? Or have you bought yourself a new process to manage?