How much does a Google Ads agency cost for ecommerce in 2026?
What a Google Ads agency really costs for ecommerce, why percentage-of-spend beats flat retainers, and the questions that protect you from overpaying.
- 12,000+PMax campaigns audited
- 200+Live ecom clients
- €200M+Tracked sales
If you are trying to figure out what a Google Ads agency costs for ecommerce, here is the honest answer first.
Agencies charge one of three ways. A flat monthly retainer, usually $1,000 to $5,000 or more. A percentage of your ad spend, usually 6% to 15%. Or a smaller base fee plus a performance bonus. For a store that wants to grow, percentage of spend is the fairest by a mile, because the agency only earns more when you earn more.
We are ZenoX Media, and we charge a tiered percentage of spend with no flat retainer. It starts at 10% on the first €10k of monthly spend and drops toward 6% once you are above €150k. The full breakdown lives on our pricing page. This post explains why pricing models matter more than the headline number.
Flat retainer
$1-5K+/mo
Percentage of spend
6-15%
ZenoX tiered fee
10% to 6%
Flat retainers that grow with you
0%
Why the pricing model matters more than the number
A flat retainer sounds simple. The problem is what it does to the agency's behaviour. They get paid the same whether your account doubles or sits still. There is no money reason for them to fight for your growth. The quiet accounts and the scaling accounts pay the same, so the quiet ones get the same effort.
A percentage of spend flips that. When you grow, the agency grows with you. When you stall, they feel it too. Their job and your goal point the same direction.
Compare the three pricing models honestly
| Flat retainer | Percentage of spend | Base + performance | |
|---|---|---|---|
| Agency earns more when you grow | No | Yes | Partly |
| Predictable monthly cost | Yes | Scales with spend | Mostly |
| Reason to push your account | Weak | Strong | Medium |
| Risk of paying for little work | High | Low | Medium |
| Best for | Tiny, fixed budgets | Stores scaling past €10k/mo | Risk-sharing setups |
Why our percentage drops as you scale
Here is the part most agencies do not explain. The work does not grow as fast as the spend. Managing €150k a month is not 15 times harder than managing €10k. A lot of the heavy lifting - feed engineering, account structure, tracking - is set up once and then maintained.
So as you scale, a fair agency shares that efficiency back. That is why our percentage falls from 10% toward 6% across five brackets instead of taking a bigger and bigger slice. The opposite - a percentage that stays flat or climbs - quietly punishes you for growing.
What the fee must include (or the price is a lie)
A low headline price means nothing if the real work is an add-on. For ecommerce, the fee should already include all of this.
- Merchant Center feed engineering. Titles, categories, GTINs, custom labels. This is where most of the money is won.
- Account structure. Performance Max and Shopping built to scale, not one campaign with the whole catalogue dumped in.
- Server-side tracking. Pixel-only loses 30 to 40% of iOS conversions. If tracking is extra, the cheap price just got expensive.
- Real reporting. Weekly numbers tied to revenue, not vanity clicks.
If feed work or tracking is a paid extra, the agency is hiding the true cost in the small print.
So what should you actually pay?
For a real ecommerce store scaling past €10k a month, expect to pay a percentage of spend in the 6% to 12% range, with the percentage dropping as you grow, and with feed work and server-side tracking already included. If you are quoted a flat retainer with feed and tracking as extras, the cheap number is the bait, not the price.
Want the exact brackets for your spend level? They are on our pricing page, and you can see our process to know exactly what that fee buys.