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The red flags when hiring a marketing agency are usually in the pitch, not after you've signed. Here's what to look for before you commit to a retainer.
Hiring a marketing agency is one of the higher-stakes decisions a DTC founder makes. The wrong agency costs you money, time, and often months of momentum you can't get back. The harder part is that the red flags are often most visible in the sales process, not after you've signed. Most founders don't know what to look for because they're evaluating the pitch rather than what the pitch reveals.
These are the signals worth paying attention to.
Case studies are useful context. They become a red flag when they're the primary evidence of capability and the numbers aren't interrogated. "We grew a brand's email revenue by 300%" tells you almost nothing without knowing the starting point, the category, the timeframe, the investment, and whether the result was sustained. A 300% increase from £5,000 a month is very different from £500,000 a month.
The agency that's confident in its work will show you the context. The one that isn't will show you the headline.
A competent agency can tell you, without jargon, exactly what they do and why it works. They can explain how they build a Klaviyo flow architecture, what their creative testing framework looks like, why they structure campaigns the way they do. If the explanation defaults to buzzwords, vague frameworks, or phrases like "a holistic approach" without substance, that's a signal.
Complexity is not sophistication. The best practitioners in any channel can explain what they do clearly enough that a non-specialist can follow the logic.
"You'll see results within 30 days" is sometimes true for specific interventions like fixing a broken abandoned cart flow. It's rarely true for paid media at scale or full account restructures. An agency promising fast results is usually optimising for the close, not for your expectations.
Realistic timelines for paid: 60 to 90 days to establish baseline performance after account restructure and creative testing. Realistic timelines for email: 30 to 60 days to see meaningful flow performance after proper architecture is in place. Realistic timelines for Shopify development: depends heavily on scope, but be wary of any fixed-scope promise without a clear discovery process.
An agency that's not asking about your margins, your customer LTV, your current attribution setup, and where you've struggled in the past either doesn't know what they need to know or isn't paying attention. Both are problems.
The right agency goes into a discovery call wanting to understand your business, not just your budget. They should be asking things that make you think, not just confirming what you've already told them you need.
This is one of the most common points of friction after signing. You meet senior people in the pitch — founders, directors, senior strategists — and post-onboarding the day-to-day is handled by a junior account manager. Ask directly: who would be managing our account on a daily basis? What's their background? Can we meet them before we commit?
An agency that's confident in their team will say yes. One that deflects or says the senior team stays closely involved without specifics is telling you something.
Every agency has accounts where things didn't go as planned. The ones worth working with can talk about those situations honestly: what happened, what they learned, and what they'd do differently. The ones that only have success stories are either very selective about what they share or haven't been doing this long enough to have a library of failures.
How an agency talks about failure in the pitch is a reasonable proxy for how they'll communicate when things go wrong in the relationship.
A flat retainer that doesn't change regardless of performance puts the incentive on the agency to maintain the relationship, not improve the results. That's not inherently wrong — it can work in relationships with strong trust and clear accountability — but it means you need other mechanisms for holding performance accountable.
Ask how performance is measured. Ask what happens if targets aren't hit. Ask what the exit process looks like. An agency that's confident in its performance won't find these questions uncomfortable.
This is the inverse of a red flag — it's a positive signal. An agency that asks sharp, specific questions about your brand, your economics, your competitive position, and your previous attempts is demonstrating that they know what matters. An agency that gives sharp, specific answers to questions you weren't expecting is showing you the same thing.
The pitch is far more likely to challenge your competitors' strategies, your own assumptions, and the market conditions you're operating in. That's the thinking you're paying for.
If you're still working out whether to hire an agency at all, read In-House vs Agency for eCommerce Marketing: An Honest Comparison first. And when you're ready to structure the conversations, The Questions Every DTC Founder Should Ask Before Signing With an Agency gives you the right framework.
We've worked with DTC brands in fashion, beauty, and lifestyle for nearly 10 years. If you're in the process of evaluating agencies and want an honest conversation, start here.
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