In many B2B organisations today, the question is no longer whether to use an agency. It’s if and followed by when.
In-house teams are close to customers, more embedded in the business, and increasingly capable across strategy, execution and performance. In-house teams bring clear advantages, but they also come with trade-offs that are easy to miss when you’re in the middle of it.
On the one hand, they’re more cost-effective, but those savings can quickly disappear when work needs to be rethought or reworked. Things move faster, but momentum can stall the moment if work is judged on a “I’ll know it when I see it” basis. The discipline of interrogating why something works can fade over time, and slide into the familiar happens.
Stakeholders feel closer and more aligned, but on the other, that familiarity can make it harder to ask the challenging questions needed so assumptions creep in. It feels good that activities like organic social sit fully within your control, but performance can quietly decline as the landscape shifts particularly as LLMs begin to reshape how audiences discover and engage.
Agencies haven’t disappeared. But their role has evolved.
The best ones don’t sit at arm’s length, delivering campaigns in isolation. They wrap around in-house teams, adding perspective, pace and specialist capability where it matters most. Commonly, engagements have moved to provide targeted support in specific areas, often on a project-by-project basis.
This now gives a Marketing Leader a difficult challenge – when to engage the agency. From our experience, there are several moments where that perspective can make a meaningful difference.
When you can’t read the label from inside the jar.
Good marketing is based on credible insight. Speaking to customers and partners as a brand does not always produce the insight that comes from using a credible, external third party. Seeking validation for a pre-formed idea is different to exploring areas from which fresh perspectives, ideas and approaches flow. Creativity never comes from doing the same things repeatedly.
When alignment needs an external voice
There are times when the challenge isn’t the thinking – it’s getting that thinking heard and agreed. When the analysis is originated internally, position on the hierarchy or proximity to (friendly) customer conversations seem to give certain perspectives more weight. An external voice cuts through so that ideas travel further across the organisation.
This matters more than ever in an environment where performance gaps are widening. In B2B sales teams, just 17% of reps generate 81% of revenue (source: Forrester / 2025 B2B sales & marketing performance research), underlining how much depends on alignment around the right decisions.
When a fresh perspective unlocks new thinking
Even strong teams can become close to their own ways of working. Not through lack of ability, but through proximity. The same challenges, the same channels, the same patterns repeated over time. And declining performance.
When important projects need focus and pace
There are moments when the nature of the work changes. A rebrand. A new proposition. A major launch. These require sustained focus, multiple skillsets, and delivery at pace — all at once. For in-house teams already balancing competing priorities, that can be difficult to create without trade-offs.
An agency brings concentration. Not just an additional resource, but experience drawn from similar projects, helping avoid common pitfalls and accelerate progress.
When the next step is unfamiliar
Growth often means change. New markets. New audiences. New ways of engaging buyers. But stepping back to rethink an approach is difficult when you’re also responsible for delivering results in the short term. Likewise, how do you assess “What does good look like?”
At the same time, the pace of change is accelerating. An external partner can help navigate that shift, bringing perspective from similar transitions and enabling progress without needing to learn every lesson first-hand. Why work it out yourself when you can learn from someone who has been there before?
When you’re close to the product, the market and the internal dynamics, it becomes harder to see what’s unclear, what’s assumed, and what could be done differently.
An external partner brings that outside-in view not just as a fresh perspective, but shaped by working with similar companies, facing similar challenges, in similar markets. The value isn’t simply objectivity. It’s pattern recognition.
Because in a world of rising expectations, increasing complexity and constant change, one thing remains true: sometimes, you just need someone who brings a fresh perspective, ideas and impact.