Google Ads Agency or In-House: What Actually Pays Off for Your Online Shop?

As your shop grows, the question eventually arises: agency or your own team? Both paths have their merits. We give you the honest comparison, including the uncomfortable truths that agency blogs usually keep quiet — and tell you at what shop size each path actually makes sense.

As your online shop grows and Google Ads becomes a serious growth channel, sooner or later the question arises: do you hire a Google Ads agency or build your own team? Both paths have their merits, and the answer depends far more on your specific situation than many online guides would have you believe.

In this post, we'll take an honest look at both models — including the uncomfortable truths that most agency blogs keep quiet about.

What Does In-House Google Ads Management Really Mean?

In-house sounds attractive at first glance. A permanent team member who knows your shop, loves your products and focuses exclusively on your campaigns. The reality often looks different.

An experienced Google Ads manager with five years of e-commerce experience easily costs between €55,000 and €85,000 in gross annual salary in Germany, plus payroll overheads and equipment. Realistically, that's €80,000 to €120,000 per year before your first cent goes into advertising. For a shop with annual revenue under one million euros, that's rarely sustainable.

The alternative is a junior employee or a career changer whom you train yourself. That can work too, but it costs you considerable time, learning costs in the form of burned ad budget, and carries the risk that the person leaves for a competitor after two years of training, taking all that hard-won knowledge with them.

Another point shop owners often underestimate: a single in-house employee only ever sees your account. They don't see what's working across ten or twenty other e-commerce accounts, have no benchmark data from comparable industries, and have no colleague to discuss difficult cases with. That leads to tunnel vision.

What Does a Google Ads Agency Actually Offer?

A good agency for Google Ads brings things to the table that a single in-house employee can hardly build up. The most important asset is the experience from many parallel accounts. When an agency manages fifteen e-commerce clients, it knows within three months of an algorithm update which strategies still work and which don't. An in-house employee has to figure that out using your budget.

Then there's access to professional tools. Licences for bid management tools, competitive intelligence software, feed optimisation solutions and script libraries quickly cost more than they ever save on a single account. At an agency, those costs are spread across many clients.

The third point is continuity. Your in-house employee gets sick, goes on holiday, resigns. Then your Google Ads management grinds to a halt, which can mean devastating revenue losses during peak season. An agency has cover built into its structure.

But here's the important caveat: not all agencies are equal. Many larger agencies effectively have you managed by a junior who may have six months of internal experience. You pay agency prices but get beginner quality. That's why many shops drift towards in-house after disappointing agency experiences — even though the problem isn't the agency model itself, but a particular type of agency.

When In-House Makes Sense

In-house is the right choice when your annual revenue is well above five million euros, your monthly ad budget is in the seven figures, or your business is structurally so specific that external management could never get deep enough into your product — think highly specialised B2B or niche compliance requirements.

Above a certain size, it makes economic sense to build a team of two to four specialists, because the workload becomes so large that it would fully occupy an external agency anyway, while keeping it internal allows more control and direct integration with other departments.

Most of the shops we advise, however, are far from that scale. For shops with annual revenue between €500,000 and €5,000,000, a specialised agency is almost always the more economical and strategically better choice.

When an Agency Is the Better Decision

If your annual revenue is below seven figures and you don't want to invest three to six months and five-figure sums in training a junior, an agency is the more economical solution. You're essentially paying for knowledge that was built up over years across other accounts, without bearing those learning costs yourself.

Likewise, if you plan to scale aggressively over the next twelve months and need professional Google Ads management fast, an agency is the more pragmatic decision. Finding, onboarding and getting a suitable in-house employee productive realistically takes six to nine months. An agency can start within two to four weeks.

The third case: you've already had bad experiences with in-house, or your previous agency didn't deliver. Then the problem often isn't the model, but the specific execution. A smaller, specialised agency where you work directly with experienced decision-makers typically delivers more quality than an in-house junior or a big agency with a junior team.

The Middle Ground: External Management with Strong Internal Involvement

In practice, the best setups we see work as a hybrid. The shop has an internal marketing lead who understands the product, the brand and the customers, working closely with an external agency that brings the Google Ads expertise.

The in-house lead handles strategic decisions, product listings, seasonal planning, briefings and coordination with other channels like social media, newsletters and SEO. The agency handles the technical execution, optimisation and reporting, and brings in the experience from other accounts.

This model is often cheaper than a highly paid in-house specialist, yet delivers more quality than a single in-house junior, because two different perspectives work together.

Cost Comparison: A Realistic Example

Let's take a typical e-commerce shop with 2 million euros in annual revenue and a monthly Google Ads budget of €15,000.

The in-house option with an experienced Google Ads manager realistically costs €90,000 in personnel costs per year, plus tool licences of around €5,000 to €8,000, plus training. That's roughly €100,000 per year, or €8,300 per month just for management.

The agency option with specialised management typically costs €1,500 to €2,500 per month at this budget level — €18,000 to €30,000 per year. On top of that, no tool costs, no training costs, no downtime.

Even if you argue that in-house gets deeper into the business, you have to weigh that advantage against a cost base nearly four times higher. For most shops, that only pays off when revenue and ad budget are significantly higher.

Conclusion: The Honest Answer to a Dishonest Question

The question "agency or in-house" is actually the wrong question. The right question is: which structure delivers the best Google Ads management for my budget? And the answer depends on the size of your business.

Up to around 5 million euros in annual revenue and a monthly ad budget under €50,000, a specialised external Google Ads agency is the better choice in almost all cases, both economically and in terms of quality. Above that scale, building internal capacity gradually starts to pay off — though usually not as a replacement for the agency, but alongside it.

If you choose the agency route, the most important decision isn't agency yes or no, but which agency. Small, specialised teams with direct access to experienced decision-makers typically deliver more quality than large agencies where you end up at the junior desk.