The decision most teams make reactively
In most organisations, the decision to hire in-house or use an agency is made reactively. A gap appears, a campaign needs running, a channel needs managing, a capability is missing, and the team reaches for the nearest available solution. Sometimes that is a job post. Sometimes it is a vendor pitch. Rarely is it a structured analysis of which model actually serves the organisation better in that specific situation.
The result is marketing functions that are patchworked together: some capabilities in-house, some with agencies, some with freelancers, with the mix reflecting the history of decisions rather than any coherent resourcing philosophy. This is not always a problem, many high-performing marketing teams are hybrid by design. But when the mix is the product of reaction rather than intention, you often end up paying more than you should for less capability than you need.
In 2024, with hiring still cautious across many sectors (a trend tracked by LinkedIn Talent Solutions) and agency fees under pressure to justify their value, the question is more worth asking deliberately than it has been in a while.
What in-house does better
In-house talent wins on context. Nobody understands the business, the product, the customers, and the internal dynamics as well as someone who works there full time. Deep product knowledge, the ability to move quickly without briefing cycles, accumulated institutional memory, and genuine investment in the company's success; these are things an agency can approximate but not replicate.
In-house talent is also better suited to work that requires constant, responsive involvement: customer communications, community management, content that draws on detailed product knowledge, internal stakeholder relationships. Anything that benefits from someone being embedded in the business rather than parachuting in and out.
The risk of over-indexing on in-house is cost and specialisation. A strong in-house generalist or even a small specialist team will always have capability gaps. And full-time headcount carries fixed costs that are hard to adjust when marketing priorities shift.
In-house teams have the context. Agencies have the scale, the specialisation, and the ability to flex. The question is which of those you need most.
What agencies do better
Agencies win on breadth, depth, and flexibility. A good agency brings senior-level expertise that would be unaffordable as a full-time hire. They have been through more campaigns, more channels, and more market conditions than most in-house teams have encountered. They can scale up for a launch and scale down after it. They see patterns across multiple clients that an in-house team, focused on a single business, cannot see.
Agencies are also better suited to specialised, project-based work: a rebrand, a media buying campaign that requires platform expertise, a PR programme that needs established journalist relationships, a technical website project. The kind of work where depth of specialist knowledge matters more than institutional context.
The risk of over-indexing on agencies is control and coherence. Work managed at arm's length, through briefing cycles and approval rounds, is slower and more vulnerable to loss of nuance. When the agency does not understand your brand well enough, or when the brief is not tight enough, the output reflects that. The accountability structures also differ, an in-house team member is accountable to the business in a way an agency is not.
The signals that point toward in-house
Hire in-house when the work requires daily involvement with the product or customer. When continuity and institutional memory are critical. When the capability is core to the marketing function's ongoing output rather than a specialist intervention. When you need someone who can own a function rather than execute a brief. And when the volume of work justifies a full-time salary rather than an agency retainer.
The signals that point toward agency
Use an agency when you need senior specialist expertise that would be too expensive or too narrow to justify as a full-time hire. When the work is campaign-based or project-based rather than ongoing. When you need a team with established infrastructure, tools, relationships, processes, that would take years to build in-house. When you need flexibility to scale without fixed-cost commitment. And when you need an external perspective that in-house proximity cannot provide.
The hybrid model, done intentionally
Most mature marketing functions operate as hybrids, and there is nothing wrong with that. The key is that the hybrid is intentional. In-house handles the work that benefits most from context, continuity, and embedding. Agencies handle the work that benefits most from specialisation, scale, and flexibility. The handoffs are clean, the briefs are tight, and the ownership of each function is unambiguous.
What makes hybrid models fail is unclear ownership, inadequate briefing, and the assumption that an agency can substitute for strategic leadership. Agencies execute strategy well. They rarely create it on their own. The thinking about what the function needs to achieve, and why, has to come from inside.
Right-sizing your marketing function
The goal is not to maximise either in-house headcount or agency spend. The goal is to have the right capabilities, in the right structure, at a cost that is proportionate to the value they generate. Getting there requires an honest audit of what the function actually needs, which of those needs are core versus specialist, and which model serves each best. It is a question worth asking annually, and worth revisiting whenever the business priorities shift significantly.