Performance Marketing Agency vs. In-House Team: Our Honest View

Most agencies will tell you to hire an agency. Of course they will. We are one. But we do not always think that is the right answer — and we would rather tell you that upfront than sign a client we cannot genuinely help.

This is our honest view.

The question nobody asks honestly

When a business owner asks “should I hire a performance marketing agency or build in-house?”, they usually get one of two answers. An agency says: hire us. A recruiter says: build a team. Neither has a financial incentive to give you the straight answer.

There is a third group worth listening to: business owners who have been through it in both directions. We talk to them regularly. Some hired an agency too early, before their ad spend was large enough to justify a retainer. Some built in-house and found that one person cannot cover six disciplines to a professional standard simultaneously. A few tried a freelancer and ended up spending more time on account management than on their actual business.

The right answer is not universal. It depends on your monthly ad spend, your product complexity, and where you are in your growth curve. Here is how to work through it without someone trying to sell you the conclusion.

The real cost of in-house

The visible cost of an in-house marketing hire is the salary. A mid-level performance marketing manager in Europe earns £45,000–£75,000 per year. Senior specialists — someone with a strong Google Ads or Meta track record and experience managing meaningful budgets — tend toward the top of that range. Junior hires cost less but require significantly more management time before they operate independently.

The invisible costs are typically larger than the salary.

Recruiting. Finding, vetting, and onboarding a good performance marketer takes 8–16 weeks. Using a recruitment agency costs 15–25% of first-year salary in fees. Going direct costs 6–10 weeks of internal time. Total recruiting cost: roughly 1–2× the annual salary, once you include the opportunity cost of the role sitting empty while you search.

Tools. A proper performance marketing stack — Semrush, a feed management tool, a creative testing suite, a reporting layer — costs £8,000–£15,000 per year for a mid-size business. Agencies share these licences across clients. Your in-house hire will need their own.

Ramp-up time. A new hire does not operate at full effectiveness on day one. A realistic ramp-up period is 3–6 months, during which ad spend is being managed sub-optimally. On a £10,000/month budget, a 20% efficiency gap during that period costs £6,000–£12,000 before the person is fully productive. That cost carries no invoice, which is why it gets overlooked.

Employment overhead. Employer National Insurance, pension contributions, holiday pay, and sick pay typically add 20–25% to gross salary in the UK. Spanish social security adds approximately 30–35%.

Breadth. One performance marketer is good at a few things. They will have a strong channel — usually the one they spent most of their career in — and be genuinely weaker on the rest. One person rarely covers Google Ads, Meta, SEO, analytics, and conversion design to a professional standard simultaneously. You pay one full salary and get one specialisation.

The real cost of an agency

Agency costs are simpler to calculate. A performance marketing retainer for an SME in Europe runs £2,000–£6,000 per month in management fees. Media spend — what you pay Google, Meta, TikTok, LinkedIn — is paid directly to the platforms and is completely separate from the retainer.

We charge flat monthly fees, not a percentage of ad spend. We explained our reasoning in this post. The short version: a percentage model gives an agency a direct financial incentive to recommend more spend than your business actually needs. We have made it a point of principle not to operate that way.

What an agency costs you beyond the retainer: you are not the team’s only priority every hour of the day. You share a team with other clients. Communication happens on scheduled calls and in shared documents, not over-the-desk conversations. An external team will never understand your product as deeply as an employee who is immersed in it daily.

What an agency saves you: no recruiting cost, no tool cost, no ramp-up time, no employment overhead, and access to a team that has likely seen your type of problem before — in a different sector, at a different stage — and knows which solutions did not work.

How to compare them fairly

The honest comparison is not salary versus retainer. It is total cost of ownership, across all four realistic options.

When in-house is the right call

We genuinely mean this. There are situations where building an in-house team is the right decision, and we will say so when we think it applies.

Your ad spend is above £50,000 per month. At that scale, you likely need a dedicated in-house person regardless — not instead of an agency, but alongside one. The account complexity, volume of creative decisions, and internal stakeholder management justify someone embedded in the business full-time.

Your product is highly technical or regulated. Medical devices, industrial B2B, highly specialised professional services. Effective ads require product knowledge that an external team builds over months. An internal hire who already has it will outperform a generalist agency on this dimension, at least initially.

You already have a strong internal marketing function. If you have a head of marketing with real paid media experience, an in-house specialist slots in cleanly. The coordination friction that makes agency relationships complicated disappears when everyone is in the same building working toward the same objectives.

Your long-term plan is an internal team anyway. The transition cost is real — recruiting, ramp-up, temporary efficiency dip — but the economics shift at scale. Starting the hire at £30,000/month in spend gives you time to hire well rather than urgently.

Our honest recommendation

The break-even point between in-house and agency is usually around £20,000 per month in ad spend. Below that, agencies win on cost-efficiency almost every time when you factor in the full cost of in-house. Above £50,000 per month, the calculation changes and a hybrid model often outperforms either option alone.

We worked with a professional services firm in Calvià, Mallorca, that learned this firsthand. They were spending £6,000 per month on Google Ads. They hired a marketing manager, gave her proper resources, and ran the experiment for six months. Results were disappointing. Not because the person was wrong for the role — she was experienced and capable. The problem was structural: one person cannot professionally manage Google Ads, a Meta account, a website, a content calendar, and monthly performance reporting simultaneously. That is not a hiring failure. It is a scope problem.

They moved to pmax in Q1 2026. Within 12 weeks, cost per qualified lead had dropped 38%. The ad budget was unchanged. What changed was channel focus, proper account structure, and having dedicated people on each component rather than one generalist stretched across everything at once.

If you are spending £3,000 per month on advertising and asking whether to hire in-house: not yet. Build your channels with an agency first. Learn what actually works for your business. When the ad spend justifies a full-time hire and you understand the discipline well enough to evaluate candidates properly, hire. That might be 18 months from now. That is the right call.

Philipp, who founded pmax, spent years on the client side before building the agency. The starting point of this post was his own frustration at receiving biased advice when he was the one making the hiring decision. The bias in this post is not toward agencies. It is toward honesty.

Browse our full list of services or start a conversation — we will tell you directly whether hiring us makes sense for where you are right now.

Need help with this?

If any of the above feels like a problem you have, tell us a bit about your situation and we will come back within a working day. First conversation is 30 minutes, on us.