Short version: Most e-commerce brands hire a Google Ads agency on the wrong signals (a slick deck, a low fee, a big logo wall) and find out six months later that nobody was actually steering the account. This guide gives you the questions and red flags that separate an agency that grows your store from one that just bills you.
Hiring help for Google Ads is one of the highest-leverage decisions an online store makes. Get it right and you have a profit engine you barely think about. Get it wrong and you lose the two things you can never get back: ad budget and months of momentum. The hard part is that the worst agencies and the best ones often pitch the same way. Here is how to tell them apart before you sign.
What a Google Ads agency is actually supposed to do
Running ads is the visible part. The work that decides whether you make money is mostly invisible: account structure, bidding strategy, the product feed feeding your Shopping and Performance Max campaigns, search term hygiene, and conversion tracking that reports the truth. A good agency spends most of its time on those, not on swapping ad headlines.
The single best filter is this: a real Google Ads partner is accountable to a business outcome (revenue, ROAS, profit), not to activity. If a proposal talks about "optimizations made" and "hours spent" instead of return on ad spend and contribution to profit, you are buying motion, not results.
The five questions that expose a weak agency
You do not need to be technical to vet an agency. You need five questions and the patience to listen for vague answers.
1. How will you measure success, and on what timeline?
A strong answer names a metric tied to your money (ROAS, profit on ad spend, blended return) and a realistic ramp. A weak answer leans on impressions, clicks, or "brand awareness" for a store whose goal is sales. If they cannot tell you what number they are accountable to, nobody is accountable.
2. Who actually works on my account day to day?
Many agencies sell you a senior strategist and hand the account to a junior running templates. Ask who logs in, how often, and how much experience they have with stores your size. The person in the pitch should not vanish after the contract is signed.
3. How do you handle Performance Max and the product feed?
For e-commerce this is the whole game. Performance Max and Shopping run on your product feed, and a neglected feed quietly caps everything above it. If the answer is "we just let Performance Max do its thing," that is a flag. Good agencies treat the feed and PMax structure as something they actively shape. See our Performance Max guide for what that control looks like.
4. Will I own my account, tracking, and data?
You should own the Google Ads account, the Merchant Center, the conversion tracking, and all the data, even if the agency sets them up. Agencies that keep ownership are building a hostage situation. The day you leave, you should be able to walk away with everything intact.
5. What does offboarding look like?
Ask how you would leave before you join. A confident agency answers plainly: notice period, account handover, no lock-in. Evasiveness here tells you they expect you to want out.
Red flags that should end the conversation
- Guaranteed results. Nobody can guarantee a specific ROAS. Google Ads has too many moving parts (competition, seasonality, your margins). A guarantee is a sales tactic, not a strategy.
- Long lock-in contracts with no exit. Confidence shows up as short notice periods, not twelve-month handcuffs. If the work is good, you will stay because you want to.
- No talk of your margins or product economics. An agency that never asks what your products cost or what margin you run cannot optimize for profit. They will optimize for whatever is easy to report.
- One person, one channel, no structure. If your whole account lives in one freelancer's head with no documentation, you are one sick week away from a stalled account.
- Reporting you cannot read. If the monthly report is a wall of metrics with no plain-language story of what happened and what is next, that is by design.
Agency, freelancer, or in-house: which fits your store?
Hiring an agency is not the only path, and it is not always the right one. The honest trade-offs:
- In-house gives you control and focus but is expensive and fragile. One hire, one set of blind spots, and recruiting senior paid-search talent is hard and slow.
- A freelancer or boutique often gives you senior attention at a fraction of agency overhead, which suits most e-commerce brands well. The risk is bandwidth and continuity, so vet for systems, not just skill.
- A larger agency brings process and bench depth but can bury your account under junior staff and account churn. Great for some, frustrating for others.
The right answer depends on your size, margin, and how hands-on you want to be. If you are an agency weighing this from the other side, our piece on why agencies outsource Google Ads covers the economics in detail.
What good looks like in practice
The brands that win with Google Ads tend to have a partner who does a few unglamorous things relentlessly: keeps the product feed clean, concentrates budget on proven winners, scales spend in controlled steps instead of leaps, and watches return on ad spend at every stage rather than at month-end. That discipline is exactly how we doubled a footwear brand's volume while holding a 6.3x ROAS. None of it is flashy. All of it compounds.
Before you sign, run a quick gut check
Ask yourself three things. Can they explain, in one sentence, how they will make you money? Do they want to understand your margins? Would leaving them be easy? If all three are yes, you are probably in good hands. If any is a no, keep looking.
If you want a second opinion on your current account before you decide, a structured audit will tell you quickly whether your ads are being managed or just maintained. Request a free audit and we will show you exactly where your account stands.