What is the difference between a marketing agency and a marketing consultant?

A marketing agency handles operational execution: running ads, producing content, managing campaigns. A marketing consultant works at the strategic level: they analyse, position, develop strategy, and guide implementation — without taking over execution themselves. An agency is an execution instrument. A consultant is a diagnostic instrument. Choosing the wrong one means solving the wrong problem.

When do I need a marketing agency vs a marketing consultant?

You need an agency when you already know what needs to be done and simply lack the capacity to execute it. You need a consultant when it's unclear what to do, when your marketing isn't producing the expected results, or when a fundamental strategic repositioning is required. In 7 out of 10 cases where marketing spend isn't working, the root cause is a missing strategy — not poor execution.

Can a marketing consultant replace an agency?

No — and a good consultant won't try to. A consultant recommends which agencies are suited for which tasks and oversees the collaboration at a strategic level. Anyone who offers both consulting and execution has a conflict of interest.

How much does a marketing consultant cost compared to an agency?

Marketing agencies typically charge monthly retainers (£1,500–£15,000+ depending on scope), plus separate media budget. Marketing consultants charge day rates (£800–£3,000 depending on experience) or project fees. A typical three-month consulting engagement costs between £8,000 and £40,000. The most expensive option is an agency without a strategic foundation underneath it.

Why does marketing fail even with a good agency?

Because an agency is an execution instrument — it needs a clear brief to work from. If the strategy is wrong, the positioning unclear, or the target audience poorly defined, even excellent execution produces poor results. The agency isn't the problem. The missing strategic foundation is.

Marketing Agency vs Consultant: When to Hire Which

Q: Can a marketing consultant and agency work together?

Yes — and that is often the most effective setup. Simon Förstemann regularly works alongside agencies: his role is to ensure all agencies are pulling in the same direction and that the strategy doesn't get lost in execution. That happens more often than people expect.

The most common mistake: a company whose marketing isn't working hires a new agency. The agency does everything properly. Results stay flat. The agency gets swapped out. The pattern repeats. The agency was never the problem.

The problem was that the company didn't know what it actually needed. An agency is an execution instrument. A consultant is a diagnostic instrument. Choose the wrong instrument and you solve the wrong problem.

Key Takeaways

— A marketing agency executes (ads, content, campaigns) and needs a clear brief; a marketing consultant diagnoses, positions, and sets strategy. Choosing the wrong one means solving the wrong problem.
— Hire an agency when you already know what to do and only lack capacity. Hire a consultant when results are flat, growth has stalled, or positioning and audience aren't clearly defined.
— Agencies bill monthly retainers (roughly £1,500–£15,000 plus separate media budget); consultants charge day rates (£800–£3,000) or a three-month project of £8,000–£40,000.
— The most expensive option is an agency running without a strategic foundation — and consultant plus agency together is often the most effective setup.

What a marketing agency does

A marketing agency takes over the operational delivery of marketing activities. For that it has dedicated teams: copywriters, designers, media planners, SEO specialists, social media managers. The agency produces, deploys, optimises, and reports.

An agency needs a clear brief: run ads for this product. Produce content for this channel. Build this website. Given clear direction, it is highly efficient and delivers reliably. It is considerably less good at asking whether that was the right brief to begin with.

Marketing Agency

Execution

Produces, deploys, optimises
Broad team of specialists
Needs a clear brief
Monthly retainers or project fees
Structural interest in ongoing work
Strongest when the direction is already set

Marketing Consultant

Strategy & Diagnosis

Analyses, positions, develops strategy
Usually works alone or with a small team
Helps when it's unclear what to do
Day rates or fixed project fees
No interest in unnecessary execution
Strongest when the foundation isn't right

The decisive difference: incentive structure

An agency earns more by producing more and running more. That's not a criticism — it's a structural incentive built into the business model. A well-run agency gives honest advice in spite of it. But the mechanism is there.

An independent consultant has no reason to recommend more than is necessary. They earn from their advisory time, not from media volume or production. That makes their recommendations structurally more independent.

Simon Förstemann's position I don't run agency services and I don't offer media management. That's a deliberate choice. It gives me the freedom to say "stop spending more — the problem is somewhere else entirely" without undermining my own business model in the process.

When you need an agency

When you already know what needs to be done and simply lack the capacity to execute it
When you need a specific craft: paid search, SEO, social ads, PR
When the strategy is in place and execution needs to scale
When a solid brief exists that lets an agency hit the ground running

When you need a consultant

When the marketing budget is burning without producing expected results
When it's unclear why growth has stalled
When positioning, message, or target audience haven't been clearly defined
When a fundamental strategic repositioning is required
When clarity on direction and priorities needs to come before any agency engagement

The most important rule of thumb If you know what you want and need someone to deliver it: agency. If you don't know what you want — or your marketing still isn't working despite having an agency — consultant first.

Can a consultant and agency work together?

Yes — and that's often the best setup. A consultant develops the strategy, defines the audience and message, gives agencies clear briefs, and oversees results at a strategic level. The agencies execute.

Simon Förstemann regularly works alongside agencies. The role is to ensure all agencies are pulling in the same direction — and that the strategy doesn't get lost in the execution. That happens more often than people expect.

What each costs

Marketing agencies typically work on monthly retainers (roughly £1,500 to £15,000 depending on scope) or project fees. On top of that comes the media budget, which flows separately.

Marketing consultants charge day rates (roughly £800 to £3,000 depending on experience and specialisation) or fixed project fees. A typical consulting engagement over three months costs between £8,000 and £40,000.

Add both together and compare against results: the most expensive option is an agency without a strategic foundation underneath it.

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About the author

Simon Förstemann

Growth strategist & marketing advisor with 14 years of experience. 6 ventures founded, 3 exits, Red Dot Award and German Design Award winner. Works 1:1 with decision-makers — no agency, no workshops that lead nowhere.

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Marketing Agency vs Marketing Consultant. What Actually Helps — and When.