In this article:
We are a B2B marketing agency. We would love every company to hire us. We have also turned down clients who were not in the right position to benefit from agency support, and it was the best thing we could have done for both parties.
This article is an honest attempt to help you make the right decision — which means it will include reasons why you should not hire an agency as clearly as reasons why you should.
What agencies are genuinely better at
Multi-discipline execution. Running SEO, paid media, content strategy, marketing automation, and website optimisation simultaneously requires five different specialisms. Hiring five senior specialists costs €500K+ in annual salaries. An agency provides all of that expertise in a single relationship at a fraction of the cost. For most companies under €5M ARR, this calculus is clear.
Speed to market. An experienced agency has done your onboarding process thirty times. They have a content brief template, a paid campaign structure, a CRM setup checklist, an attribution reporting system. Building those from scratch in-house takes months. An agency can have a functioning marketing engine running in 60–90 days.
Cross-client perspective. An agency that works with twenty B2B companies sees patterns you cannot see from inside one. They know which LinkedIn ad formats are working this quarter, which SEO content structures are ranking right now, which email sequences are generating replies. That real-time perspective is impossible to replicate in-house without access to many more data sets than you have.
Honest external challenge. Internal teams are subject to politics, hierarchy, and the natural tendency to avoid uncomfortable truths. A good agency will tell you that your homepage messaging is unclear, that your ICP is wrong, or that your sales team is not following up on the leads marketing generates. These conversations are harder to have from inside the organisation.
What in-house teams are genuinely better at
Deep product and customer knowledge. No agency knows your product, your customers' language, their specific objections, or your competitive context as well as your internal team does. The best agency partnerships are ones where the agency provides structure and channels, and the client provides deep subject matter expertise and customer insight.
Long-term strategic ownership. Fundamental questions — what markets to enter, what positioning to own, what brand to build over a decade — are better answered by people with long-term skin in the game. Agencies can inform these decisions. They should not own them.
Cost at scale. An agency makes economic sense when you cannot resource the equivalent internally. At some point — usually when you need four or more full-time marketing specialists — the build-in-house model becomes cheaper and gives you more control. Most Series B and beyond companies reach this point in at least some functions.
The four situations where hiring an agency is the right decision
Your pipeline is inconsistent and you cannot diagnose why. If your revenue is unpredictable — strong months followed by empty pipelines — you have a systematic problem, not an execution problem. An agency can identify whether the root cause is ICP definition, top-of-funnel volume, conversion rate, or nurture quality. You cannot always see the problem clearly from inside it.
You need multiple channels running simultaneously and you can only resource one. If you have one marketer trying to do SEO, paid ads, email marketing, and social simultaneously, none of them will be done well. An agency expands your effective resource without the time cost of hiring.
You need senior strategic expertise but not a full-time CMO. A fractional CMO or a strategy-led agency provides the thinking and direction of a senior marketing leader at a fraction of the cost. At early and growth stage, this is often more valuable than a full-time hire who is still building their team.
You want to launch a new channel you have never operated before. Building SEO capability from zero in-house requires hiring, tools, process development, and 6–12 months of trial and error. An agency can have the channel running profitably in 90 days because they have built it dozens of times before.
The four situations where you should build in-house instead
You do not have product-market fit. Marketing accelerates what is already working. If customers are not getting consistent value and staying, no agency can solve that with better targeting and messaging. Nail the product first. Then market it.
Your ACV is too low to support agency economics. If your average deal is €2,000 and an agency retainer is €5,000/month, you need to close 2.5 deals per month just to break even on the agency cost before considering any other customer acquisition costs. The math rarely works below an ACV of €10,000–€15,000 for a full-stack agency engagement.
You want complete hands-off marketing. Agencies are partners, not autopilot solutions. The best results come from clients who are engaged in strategy reviews, responsive on content approval, and willing to have honest conversations about what is working. If you want to completely delegate marketing without involvement, neither the agency model nor any other model will serve you well.
You are building a core internal capability that needs to be a genuine competitive advantage. Some companies need proprietary marketing capability — specific domain expertise, customer insight, creative excellence — that cannot be replicated by an agency working across multiple clients simultaneously. In this case, building in-house is not just cheaper at scale; it is strategically necessary.
The hybrid model most growth-stage companies land on
By the time a B2B company reaches €3M–€10M ARR, the most common and effective model is a combination: a strong internal marketing lead (VP or Head of Marketing) who owns strategy, brand, and content direction, supported by agency partners for specialist channels (SEO, paid media) and technical infrastructure (CRM, analytics). This model provides the institutional knowledge and strategic ownership of in-house with the specialist execution and real-time channel expertise of an agency.
If you are trying to decide whether this is the right moment to bring in agency support — or what the right structure looks like — we are happy to have that conversation honestly, including recommending against it if it is not the right fit.
FAQ
How do you evaluate a B2B marketing agency before hiring them?
Ask four questions: Can you show results for a company with a similar business model and ACV? What does the first 90 days look like specifically? Who will actually work on my account and what is their seniority level? How do you define and measure success? Red flags: success defined as activity outputs rather than pipeline outcomes, case studies from unrelated industries, senior pitch team replaced by junior delivery team after signing.
What is a typical B2B marketing agency contract structure?
Most B2B marketing agencies work on monthly retainers ranging from €3,000 to €15,000 depending on scope and team size. Minimum engagement periods are typically 6–12 months — the compounding nature of organic channels means 30-day contracts do not give enough time to show results. Look for agencies that are confident enough in their work to offer performance reviews at 90 days.
Can you hire a B2B marketing agency for just one specific channel?
Yes, and sometimes this is the most efficient approach. If your in-house team handles content and social but you need specialist paid media management, hiring a paid-only agency gives you the expertise you need without overcomplicating the engagement. Specialist channel agencies are often more cost-effective than full-stack agencies for companies with existing internal capability in most areas.
How involved do we need to be once we hire an agency?
Plan for two to four hours per week of involvement from a key stakeholder, at minimum. This includes a weekly or bi-weekly strategy call, content review and approval, and sharing sales intelligence (what objections are coming up, what types of deals are closing). Companies that give agencies zero input and expect results are consistently disappointed. Companies that treat their agency as a strategic partner and provide good raw material get the best outcomes.
