When to hire an agency vs a consultant vs a fractional leader
By Tom Goodwin, Founder of GAMEPLAN.
Hire an agency when you need channels executed at scale, a consultant when you need a defined problem diagnosed, and a fractional leader when you need someone to own the outcome and hold everyone, including the agency, accountable. The three are not competitors; they solve different problems. The mistake I see most often is a business hiring an agency to execute when what it actually lacked was someone to decide what the agency should be doing and to judge whether it was working. That gap is a leadership gap, and no amount of execution fills it. Here is how to tell which one you need, and why most scaling businesses need the leader before they need more execution.
I have been all three sides of this. I ran an agency through to acquisition, I consult on defined problems, and I run fractional engagements as an embedded leader. Having sat in each seat, I can be honest about what each is good for and where each falls short.
What does each one actually do?
The clearest way to see the difference is by what they own and what they sell.
| Agency | Consultant | Fractional leader | |
|---|---|---|---|
| Sells | Execution hours | A deliverable | Accountability |
| Owns | The work | The diagnosis | The outcome |
| Stays | While retained | Until the report lands | Embedded, ongoing |
| Incentive | Its own retention | Project completion | Your number moving |
| Best for | Scaling delivery | A one-off problem | Owning strategy and standards |
| Weakness | Optimises for itself | Leaves before execution | Not a delivery team |
An agency is a delivery engine. A consultant is a sharp diagnosis with an end date. A fractional leader is the person who decides what should happen, makes sure it does, and answers for the result. The incentive row is the one to read twice: an agency is paid to keep being retained, which is not always the same as being paid for your growth.
When should you hire an agency?
When you have a clear strategy and need hands to execute it at volume. Agencies are good at scaled, repeatable delivery: running campaigns across many markets, producing assets, managing the daily mechanics of channels. If you know what you want done and just need capacity to do it, an agency is the right buy. When I won a 13-market Gucci pitch at Assembly, the client needed exactly that, coordinated execution across markets at a scale no individual could deliver.
The failure mode is hiring an agency to provide strategy it is not incentivised to optimise. An agency will happily run your account, but it will optimise for retention and for the metrics that justify its fee, not necessarily for your contribution margin. Without someone on your side directing and reviewing it, you tend to overpay for undirected execution.
When should you hire a consultant?
When you have a specific, bounded problem and need an expert diagnosis you can act on. A measurement audit, a channel review, a one-off strategic question: these suit a consultant, who comes in, diagnoses, hands you a plan, and leaves. You get senior thinking without an ongoing commitment.
The limit is structural: a consultant leaves before execution. The plan is only as good as your ability to implement it after they have gone, and many excellent plans die on the shelf because nobody owned the doing. If your problem is “I do not know what is wrong”, a consultant is ideal. If your problem is “I know roughly what to do but nobody senior is owning it”, a consultant will not fix that, because the gap reopens the day they leave.
When should you hire a fractional leader?
When you have execution capacity but no senior person owning the strategy and holding that execution to account. This is the most common real situation in a scaling business: there is a team or an agency doing the work, money is being spent, dashboards exist, but no one with the seniority to say “this is the wrong number to optimise” or “this agency is not earning its fee” is on your side of the table. A fractional leader fills that exact gap. They set the strategy, own the outcome, and stay embedded, but at one to three days a week rather than a full-time salary.
Crucially, a fractional leader works with your agency, not instead of it. They direct it, review its work, and hold it accountable on your behalf, which usually makes the agency more effective and stops the overpayment problem above.
Can you combine them?
Yes, and the combination is often strongest: an agency to execute, a fractional leader to own the strategy and the number and to hold the agency to account, and a consultant brought in for a specific deep dive when needed. The fractional leader is the connective tissue. They make the agency earn its fee and turn a consultant’s report into action that actually happens. For a business spending £30k+ a month on media, this is usually the most efficient structure, because the leader’s accountability prevents far more waste than the leader costs.
How do you choose quickly?
Answer one question: what do you actually lack? If you lack hands, hire an agency. If you lack a diagnosis, hire a consultant. If you lack ownership and senior judgement, hire a fractional leader. Most businesses that think they need more execution actually lack ownership, which is why they keep changing agencies and getting the same result. The constant in those failures is not the agency. It is the absence of anyone senior on the client side owning the outcome.
A note for agency owners
If you run an agency and you are reading this thinking about your own clients, it is worth turning the lens on your own business too. The same shifts that make fractional leadership valuable, AI compressing execution, value moving from hours to judgement, are reshaping what an agency is worth and what a buyer will pay for one. If you are thinking ahead to your own exit or sale, the structure and accountability of your business matters as much as its revenue. I have written about preparing an agency for that moment here: /agency-exit-readiness. Having negotiated my own agency’s acquisition, I know how early that thinking needs to start.
If you are not sure whether you need an agency, a consultant or a fractional leader, the honest answer usually becomes obvious once you name what you actually lack. I run fractional engagements for businesses that have execution but need senior ownership, and I will tell you plainly if an agency or a consultant would serve you better. Start here: /work-with-me/fractional-performance-leadership.