Build the function or buy it is the wrong frame. The real questions are whether you have enough steady work to keep a senior operator busy, and whether you can actually hire one. Answer those honestly and the decision makes itself.
Teams usually argue this on cost, which is the least useful axis. An in-house hire looks cheaper than a partner on the salary line and is often more expensive once you count ramp, tools, coverage gaps, and the risk of a single point of failure. Here is how I think about it, including the case against hiring me.
The question is seniority and utilization, not cost
Paid media results come from judgment: what to test, what to kill, where the budget should sit, how to read a number that the platform is lying about. That judgment is senior, and senior is expensive whether it sits inside or outside your company. The cost difference between in-house and outsourced is smaller than it looks, because you are paying for the same scarce thing either way.
So the first real question is utilization. A senior full-time hire is only worth it if you have enough paid work to keep that person genuinely busy every week. Below a certain spend and complexity, you cannot fill a senior person's week, so you either overpay for idle time or, more commonly, you hire junior to fit the budget and lose the judgment that was the whole point.
When in-house is the right call
Bring it in-house when three things are true. One, paid is a large, permanent line in your budget with steady week-to-week work, not a seasonal push. Two, you can actually recruit and retain someone senior, which is harder and slower than most teams assume. Three, paid is core enough to your business that you want the knowledge living inside the company, compounding, not walking out the door at the end of a contract.
When all three hold, in-house wins, because a good operator who lives inside your business builds context no outsider fully matches. The failure mode is doing it too early, when the workload cannot support a senior salary and you end up with a junior marketer learning on your budget.
When outsourcing is the right call
Outsource when the workload is uneven, when you cannot yet justify or land a senior full-time hire, or when you need experienced hands on the account now instead of after a three-month hiring cycle. A good partner gives you senior judgment without a senior headcount, and without the single-point-of-failure risk that the one person you hired quits and takes the account knowledge with them.
The thing to insist on is that you are buying seniority, not a logo. Plenty of agencies sell a senior pitch and staff the work to juniors, which is the worst of both worlds: agency markup, junior execution. If you outsource, outsource to someone who actually does the work. I wrote the fuller version of that argument in agency, freelancer, or operator and the cost side in what a fractional hire costs.
The honest cost comparison
Compare total cost to total cost, not salary to retainer. In-house is salary plus benefits plus tools plus the ramp months before the person is productive plus the risk premium of depending on one hire. Outsourced is the fee, full stop, with coverage from day one and no single point of failure. One senior person also cannot be expert at search, paid social, creative, and measurement at once, so an in-house hire usually means specializing or spreading thin, while a good partner brings range.
Run it honestly and the gap narrows or flips. The cheapest option on the salary line is frequently the most expensive per result, which is the same trap as judging a lead by its cost per form fill.
You can do both, and probably should eventually
This is not a permanent, binary choice. The best setup for a growing company is often a sequence. A senior partner runs paid now, builds the account and the measurement system properly, and proves out the motion. Later, when the workload and the budget justify it, you hire in-house and inherit a clean, documented account instead of starting from scratch. Or you keep a partner on the hard parts, strategy and the channels that need deep expertise, while an in-house marketer owns coordination and institutional memory. Build and buy are not enemies. The mistake is treating the decision as forever when it is really about where you are right now.
Common questions
Should I hire paid media in-house or outsource it?
Hire in-house when you have enough steady paid work to keep a senior person fully occupied, you can actually recruit someone senior, and paid media is core enough that you want the knowledge living inside the company. Outsource when the workload is uneven, you cannot yet justify or land a senior full-time hire, or you need experienced hands on the account now rather than after a hiring cycle.
Is it cheaper to run paid media in-house?
Rarely as cheap as it looks. A senior in-house hire costs salary plus benefits, tools, and ramp time, and one person cannot be senior at search, social, creative, and measurement at once. The honest comparison is total cost against a partner, including the months before an in-house hire is productive and the risk that the one person you hired leaves.
When does it make sense to bring paid media in-house?
When paid is a large, permanent line in the budget, the work is steady enough to keep a senior person busy every week, and you are confident you can hire and retain that person. Many companies get there eventually. The mistake is doing it too early, when the workload cannot support a senior salary and you end up hiring junior instead.
Can you do both in-house and outsourced?
Yes, and it is often the best answer. A senior partner owns strategy and the hard parts while an in-house marketer owns day-to-day coordination and institutional knowledge. Or a partner runs it now and builds the system, then hands a clean, documented account to the in-house hire you make later. The two are not mutually exclusive.