Comparison · 7 min read
External Marketing Consulting or In-House Team. What's Really Better.
Most businesses make this decision based on gut feeling. They should make it based on numbers. Because the true cost of an in-house team is systematically underestimated, and the cost of external marketing consulting is systematically overestimated.
Simon Förstemann
Growth Strategist
May 2026
Updated: August 2026
The short answer: external marketing consulting wins during growth phases; an in-house team wins once the marketing model is established and execution speed is all that matters. In 7 out of 10 cases, SMEs and small businesses that come to Simon Förstemann have tried to build in-house capability too early, and paid for it twice.
No business wants to rely on external consultants indefinitely. Building internal capability is always the long-term goal. But the path there often runs through external support, precisely because the knowledge and experience needed to make the right decisions does not yet exist internally.
The question is not either-or. The question is: what mix is right at each stage of growth, and how does that shift as the company scales?
Key Takeaways
- · A senior in-house marketing manager costs £90,000–£130,000 a year all-in; an external consultant on a project basis runs £15,000–£60,000 with no employer costs, no notice period, and an immediate start.
- · External marketing consulting wins during growth phases; an in-house team wins once the marketing model is established and execution speed is all that matters.
- · A consultant judges positioning and strategy from outside, without being part of the structure they judge. That is not a weakness of the team, it is a vantage point the team cannot have from inside.
- · The strongest results come from a hybrid model: a lean in-house team for execution plus an external strategist for direction, the structure that drove +74% revenue growth for one client in 16 months.
The five real advantages of external marketing consulting
- Experience drawn from dozens of companies and industries
- No organizational blind spots
- Ready to start immediately, zero onboarding
- Sees the company from outside
- No salary, no employer costs, no notice period
- Ends when the job is done
- Deep company knowledge, but only after a long onboarding
- Ongoing capacity for day-to-day tasks
- Cultural integration
- High fixed costs regardless of workload
- Recruiting takes 3 to 9 months for a senior role
- Knowledge stays in-house after consultants leave
The cost comparison in real numbers
What many businesses overlook: the total cost of an in-house employee runs significantly above the gross salary figure on the offer letter.
This does not mean external marketing consulting is always cheaper. For sustained, high-volume execution, a permanent in-house team becomes more efficient. The problem is that sustained, high-volume demand takes time to build. During that build-up phase, external support is almost always the more economical choice.
What can external consultants do that in-house employees structurally cannot?
This is the most underestimated point in the whole debate: anyone working inside the company sees it from inside. For everything that is execution, that is an advantage. For positioning it is a limit, because positioning is the very structure you stand in. From inside, you never see it whole.
There is another dimension: an external marketing consultant has worked with dozens of companies across their career. They know what works and what does not, because they have lived through both, repeatedly. An in-house employee learns from one company and then advances within it. That is not a deficiency, it is a structural difference. And for strategic decisions, it matters enormously.
The model that works best in practice
The companies Simon Förstemann has worked with most successfully all combine both approaches: a lean in-house team for operational execution and day-to-day communications, plus external consulting for strategic direction, fresh perspective, and situations where internal knowledge runs out.
In this model, the external consultant's role is the strategic layer: positioning, growth strategy, channel decisions, budget allocation. The internal team executes. The result is the best of both worlds, and it is the structure that produced +74% revenue growth for one client over 16 months.
When is a pure in-house team the right answer?
- When the business is large enough to keep full-time positions continuously occupied
- When the marketing model is already established and execution speed is the priority
- When deep company knowledge and cultural fit outweigh the value of an external perspective
- When recruiting, managing, and developing teams is already a core competency of the business
Frequently asked questions
What are the advantages of external marketing consulting over an in-house team?
External marketing consultants bring experience from dozens of companies and industries, carry no organizational blind spots, are available immediately with no onboarding, and see the positioning from outside, as a whole, which is structurally hard to do from inside. For SMEs and small businesses in growth phases, this independence is often the decisive advantage.
What can an external marketing consultant do that in-house employees structurally cannot?
See the positioning as a whole. Anyone inside the company stands within the structure they would need to judge, which is not a question of courage or competence. An external consultant has seen a hundred other positionings and can therefore name the cause in the first conversation, even when it sits with the CEO. That structural difference is worth a great deal.
Should I hire someone or get outside advice first?
Advice first, if it is not yet settled what the role is actually for. A hire fixes for years which skills sit in the house, and making that decision without a strategy is expensive because it is hard to correct. The reverse also holds: if it is clear what needs doing and only capacity is missing, hiring is the cheaper answer.
Intro call
Hire, or first work out what for?
Tell me what you do yourselves today and what keeps falling behind. I will take a look and tell you whether a role is the right answer or something else is.
If it is something else, I work it out with you and help execute it until someone is there to take it over.
Book a call →30 minutes · Informal introduction · Directly with Simon Förstemann
Frequently asked questions
What are the main advantages of external marketing consulting over an in-house team?
External marketing consultants bring cross-industry experience from dozens of engagements, have no organizational blind spots, start immediately with no onboarding required, and see the positioning from outside, as a whole. That outside view is often the most valuable thing a business can get, and it is structurally hard to produce from inside.
How much does an in-house marketing team cost compared to external consulting?
A senior marketing manager costs £90,000 to £130,000 per year once you include employer contributions, holiday, sick pay, tools, training, and a share of recruiting costs. An external marketing consultant on a project basis typically runs £15,000 to £60,000 per year with no fixed commitment and no notice period. The economic case for external consulting is strongest during the growth phase, before sustained in-house demand exists.
When is an in-house marketing team the right choice?
When the business is large enough to keep full-time roles fully occupied on an ongoing basis, when the marketing model is already established and execution speed is what matters most, and when recruiting and team leadership are already a core competency. For most SMEs and small businesses still in the growth phase, this point has not yet arrived.
Can external marketing consulting and an in-house team work together?
Yes, and this hybrid model consistently delivers the strongest results in practice. A lean in-house team handles execution and ongoing communications. The external consultant sets strategic direction: positioning, growth strategy, channel mix, budget allocation. Each party does what it does best. Simon Förstemann works in exactly this model with most of his long-term clients.
How quickly can an external marketing consultant get started?
Immediately, that is one of the defining advantages. There is no recruiting process (which takes 3 to 9 months for a senior role), no onboarding, and no ramp-up period. An experienced external marketing consultant can start adding meaningful value from the first week of the engagement.
Is external marketing consulting worth it for small businesses?
Often more so than for large companies. Small businesses and SMEs in growth phases lack the volume to justify a full senior hire, but face strategic decisions that have outsized consequences. External marketing consulting gives small businesses access to senior-level thinking at a fraction of the cost of a permanent hire, and without committing to a permanent role before it is clear what that role is for.
About the author
Simon Förstemann
Simon Förstemann knows what it's like to be in your position: 14 years of experience, 6 ventures founded, 3 exits, Red Dot, German Design Award and German Brand Award 2026. He brings that experience 1:1 into your company, so your marketing sells instead of just keeping everyone busy. He doesn't just advise, he also supports you hands-on with the implementation. No workshops, no apparatus. Your agency and your team stay on board.
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