Most European eCommerce brands pay for Google Ads management one of three ways: a percentage of ad spend (typically 10–20%), a flat monthly fee (commonly ~€1,000–€5,000+ depending on account size), or an in-house hire (€60k–€90k+/yr fully loaded). The percentage model pays the agency more when you spend more, which is why a flat fee is usually better aligned with your profit.
If you are a European eCommerce brand trying to work out what Google Ads management should cost, the honest answer is: it depends far less on the size of the agency and far more on the pricing model and who actually does the work. Below is how the three common models really compare, what drives the number, and how to sanity-check any quote you are given.
The three ways you'll be charged
Almost every quote you receive will fall into one of these three structures. Each changes the incentives behind your account, not just the invoice.
| Model | Typical cost (EU) | The catch |
|---|---|---|
| % of ad spend | 10–20% of monthly spend | The agency earns more when you spend more, not when you profit more. |
| Flat monthly fee | ~€1,000–€5,000+/mo by scope & account size | Predictable, incentive-aligned, but you must check who is actually on the account. |
| In-house hire | €60k–€90k+/yr fully loaded | Dedicated and close to the business, but expensive and hard to hire senior. |
For reference, Watermouse charges a flat fee (€1,500–€4,000/mo) precisely to avoid the percentage-of-spend conflict, more on why below.
What actually drives the price
Two accounts spending the same amount can justify very different fees. The real cost drivers are:
- Account size and spend, more budget means more testing, more structure, and more risk to manage.
- Number of markets and languages, running NL, UK and DE well is three markets' worth of work, not one.
- Feed and catalogue complexity, a 5,000-SKU Shopping feed needs far more attention than a 30-product range.
- Channel mix, Search-only is lighter than a full Search + Shopping + Performance Max + YouTube build.
- Reporting and involvement, weekly senior oversight and honest analysis cost more than an automated monthly dashboard.
Why percentage-of-spend quietly works against you
The percentage model is the industry default, and it contains a structural conflict: your agency is paid more precisely when it spends more of your money. There is rarely a strong incentive to cut wasted spend, consolidate, or tell you that you are over-invested in a channel, because doing so lowers their own fee.
A flat fee removes that conflict. Whether the right move this month is to scale up or to pull back, the fee is the same, so the advice you get is about your profit, not the agency's revenue.
What you should actually be paying for
Price is only meaningful against what is delivered. The things worth paying for are:
- Senior time on the account, the person making daily decisions should have run accounts like yours before.
- Honest reporting, revenue, ROAS and CAC, with an explanation of why they moved, not impressions and clicks.
- Structural work, feed quality, account architecture, bidding logic. The unglamorous work that compounds.
What you should not be paying senior rates for: a junior learning on your budget while a senior name appears only on the contract and the quarterly call.
Red flags in a pricing conversation
- “You'll have a team”, often means a junior does the work and you rarely speak to the senior you were sold.
- Long lock-ins, a 12-month contract with heavy exit penalties protects the agency, not your results.
- Reporting built on vanity metrics, if the proposal leads with impressions and CTR, that is what they will optimise for.
- A fee that scales with spend but not with value, see above.
So what should you budget?
A sensible way to frame it: decide your monthly ad spend first, then treat management as a layer on top that should be a reasonable share of that spend at your size. At smaller spends a flat fee will look like a larger percentage; as you scale, that same fee becomes a smaller and smaller share, which is exactly the direction the maths should run. If a quote does the opposite (taking a fixed percentage that never shrinks), you are paying more for the privilege of growing.
Not sure whether your current setup or quote is fair? A free audit will tell you what your account actually needs, and whether you are over- or under-paying for it.
