Most companies spend more time vetting a new coffee machine than they do vetting a Google Ads agency. And then they wonder why they’re 8 months into a contract with nothing to show for it except a slightly thinner bank account and a lot of slides about “brand awareness.”
Here’s the uncomfortable truth: the Google Ads agency market is flooded with operators who are very good at winning business and mediocre at running it. They know how to sell. They’ve got the Google Partner badge, the slick deck, the case study with the 300% ROAS client they’ll reference in every call. What they don’t always have is someone who actually knows what they’re doing inside your account every week.
This guide is your due diligence framework. Use it before you sign anything.
- A Google Partner badge is a minimum bar, not a differentiator — ask who actually manages your account day-to-day
- Measurement setup is the single biggest variable separating good agencies from great ones — grill them on conversion tracking and attribution before anything else
- Any agency that can’t explain what they’ll do in the first 90 days in specific terms is improvising
- Red flags are loud if you know what to listen for: vague reporting, percentage-of-spend pricing with no performance link, and resistance to granting you admin access to your own account
- The best agencies teach you things during the sales process — if you leave the first call knowing nothing new, that’s your answer
Why Most Agency Vetting Processes Fail (And What to Do Instead)
The typical vetting process goes like this: you Google “Google Ads agency,” shortlist three or four based on their website, get on discovery calls, collect proposals, pick the one with the most compelling deck or the lowest price. That process is almost perfectly designed to select for great salespeople, not great advertisers.
What actually predicts agency performance has almost nothing to do with their website. It comes down to: the specific person managing your account, their methodology for measurement, how they handle the first 90 days, and whether their incentive structure is aligned with yours.
A real vetting process forces the agency to demonstrate competence during the sales cycle — not just describe it. If you ask the right questions, the gaps reveal themselves fast. If you already know you need an agency (rather than in-house talent), the honest framework for making that call is worth reviewing before you start outreach.
The Non-Negotiables on Your Google Ads Agency Checklist
Think of this as your minimum bar. If an agency fails any of these, stop the process there — no matter how good their pitch is.
1. You own the account. Full stop.
Your Google Ads account must live under your Google account, with you as the admin. The agency gets manager access through a Google Ads Manager Account (MCC). If they push back on this, or if the account would be created under their MCC with you as a user — walk away. You’ll be handing them leverage they will absolutely use if the relationship goes sideways.
2. They can explain their measurement setup in plain language
Ask them: “Walk me through exactly how you’d set up conversion tracking for our account.” If the answer is vague (“we use Google’s built-in tracking”) or if they don’t immediately bring up GA4, GTM, enhanced conversions, and attribution — that’s a problem. Most accounts get conversion tracking wrong from day one, and a bad measurement foundation corrupts every optimization decision that follows.
If you’re in B2B, push harder. Ask them how they handle leads that never close. Do they know what offline conversion tracking is and how to implement it? An agency optimizing your campaigns toward form fills without feeding actual closed revenue back into Google’s bidding algorithm is, at best, generating cheap leads that don’t convert. At worst, they’re actively training the algorithm to find more of them.
3. There’s a named, senior person on your account
Ask directly: “Who will be the person working in our account every week? What’s their Google Ads experience? How many accounts do they manage?” The industry standard for a competent specialist is roughly 8–15 accounts. If they’re managing 30+, your account is getting 90-minute monthly maintenance calls and not much else.
4. Their pricing structure doesn’t actively work against you
Percentage-of-spend pricing models (typically 10–20% of monthly ad spend) create a quiet conflict of interest. The agency earns more when your budget goes up, regardless of whether that increase is justified. Flat monthly retainers are cleaner. Performance-based components (bonuses tied to agreed KPIs) are even better, because now you’re aligned. Ask how their fee changes if your budget changes. The answer tells you a lot.
Questions to Ask a Google Ads Agency That Will Actually Reveal Competence
Generic questions get generic answers. These are designed to force specificity:
“What would you fix in our account in the first 30 days?” They should either ask for access to audit it first (good sign) or lay out a specific diagnostic framework they use for new accounts. Vague answers about “reviewing the account structure” mean nothing. You want to hear specifics: search term analysis, negative keyword gaps, conversion action audit, match type distribution, landing page alignment. If they haven’t already thought about what a structured first-90-days plan looks like, they’re going to improvise yours.
“How do you think about attribution for our kind of business?” The right answer depends on your business model — but any good agency has a strong opinion here. They should be able to explain why the attribution model they’d recommend for your account matters, and what the downstream effect is on Smart Bidding. The fact that the model you pick changes everything about how your bids behave is not obvious to a junior account manager reading from a playbook.
“What’s your approach to Performance Max?” This is a litmus test. An agency that says “we love PMax, we run it for everything” is handing Google the wheel and billing you for the ride. An agency that says “we’re skeptical of PMax and never use it” is leaving real volume on the table for some clients. The right answer involves nuance: when it makes sense, what controls they use, how they prevent it from cannibalizing branded search, and how they monitor what it’s actually spending on. Controlling Performance Max is one of the harder skills in paid search right now — any agency worth hiring should have a clear point of view.
“Can you show me a reporting example from a current client?” Anonymized is fine. But look at what metrics they’re leading with. If the report opens with impressions, clicks, and CTR — and buries ROAS, CPL, or pipeline contribution — that’s an agency optimizing for their own story, not your business outcomes. You want to see the metrics that actually matter front and center.
“What’s a campaign you ran that underperformed, and what did you learn from it?” Any agency that can’t answer this honestly hasn’t been doing this long enough, or they’re telling you what you want to hear. The best agencies have real post-mortems. They know why campaigns fail, because they’ve failed campaigns and fixed them.
Red Flags That Should End the Conversation
Some of these are subtle. Most aren’t.
They guarantee results. No legitimate agency guarantees specific CPCs, CPLs, or ROAS figures. Google’s auction changes constantly. Your competition changes. Seasonality shifts. Anyone guaranteeing outcomes either doesn’t understand the channel or is counting on you not reading the fine print.
They won’t show you the account until you sign. You should be able to audit your own account at any time. An agency that controls access as a retention mechanism is not a partner — they’re a hostage-taker.
Their “strategy” is mostly Google’s recommendations. Google’s automated recommendations exist to increase spend. Applying them uncritically — broad match everywhere, raising budgets, adding Display expansion — is the opposite of strategy. A good agency pushes back on Google’s suggestions constantly and does so with data.
They lead with the Google Partner badge as a proof point. Google Partner status requires meeting spend thresholds and passing certifications. It’s a minimum qualifier, not a competitive differentiator. Agencies that lean on it hard during the pitch usually don’t have stronger evidence of competence to offer.
No mention of negatives, match types, or search term review. If your entire initial conversation is about campaign structure and creative and they haven’t once mentioned negative keywords or how they mine search terms for waste — they’re either at a surface level or they’re not going to be hands-on with your account. Budget protection is unglamorous work. Agencies that do it well talk about it without being asked.
They talk about “impressions” and “brand awareness” when you hired them for leads or sales. This is one of the oldest deflections in the agency playbook. When conversion numbers disappoint, suddenly it’s about “top of funnel.” If your goal is pipeline or revenue, every single campaign should ladder to that. Recognizing when an agency is underperforming early — before you’re a year into the contract — is a skill worth developing.
What Good Agencies Do That Average Ones Don’t
This isn’t about tactics. It’s about operating principles.
They push back on your brief. You say “we want to target these 50 keywords.” A great agency says “eight of those keywords have intent that won’t convert for you, here’s why, and here are three you haven’t thought of that will.” If an agency just takes your input and runs with it without pushing back, they’re an execution vendor, not a strategic partner.
They care about lead quality, not just lead volume. Any agency can drive form fills if you give them enough budget. The agencies that drive revenue ask about your sales process, your close rates by channel, your average deal size. They want to know what a good lead looks like so they can prevent bad leads from burning your sales team’s time. That conversation should happen before the first campaign launches, not six months in when the sales team is complaining.
They test with intention. Not “we’ll try a few things and see what sticks” — but a structured testing roadmap with clear hypotheses, proper experiment setups, and statistical significance thresholds. Ad copy tests where both variants run simultaneously with equal budgets. Bid strategy tests with defined evaluation windows. If they can’t describe their testing methodology, they’re not really testing — they’re just changing things and claiming credit when performance improves.
They make you smarter, not more dependent. The best agency relationship you’ll ever have ends with your internal team understanding Google Ads better than they did before. They’ll explain the why behind every major decision. They’ll flag when something Google is suggesting is a trap. If an agency keeps things deliberately opaque to make themselves feel indispensable, that’s a sign they’re not confident enough in their results to let the light in.
The Audit Request: Your Best Vetting Tool
If you already have a running Google Ads account, ask every agency finalist to do a free audit before you hire them. This is standard practice and any reputable agency will agree to it.
But don’t just read the audit — evaluate it. A surface-level audit that notes “your Quality Score could be higher” and “we’d recommend more ad extensions” is copy-paste work. A real audit finds the specific structural and measurement problems in your account, quantifies the wasted spend, identifies the campaigns where Smart Bidding is being fed bad conversion data, and gives you a prioritized list of fixes ranked by impact.
If the audit is sharp, specific, and teaches you something you didn’t know about your own account — that agency has earned the next conversation.
If the audit is a generic slide deck that could apply to any account, you have your answer.
Frequently Asked Questions
How much should a Google Ads agency charge?
Pricing varies significantly by model. Flat monthly retainers for small-to-mid accounts typically run $1,500–$5,000/month. Percentage-of-spend models usually land at 10–20% of monthly ad budget. For larger accounts ($50k+/month in spend), many agencies negotiate a hybrid. Be cautious of very low pricing — under $1,000/month almost always means junior talent or an account that gets touched once a month. There’s a fuller breakdown of realistic Google Ads cost expectations if you’re benchmarking budgets.
What should I look for in a Google Ads agency for B2B?
B2B requires specific expertise that not every agency has. You want someone who understands long sales cycles, lead quality (not just volume), offline conversion tracking, and how to structure campaigns around intent stages. Ask whether they’ve worked with companies where the sales cycle is 30+ days. If they haven’t, their optimization strategy will default to “more leads” rather than “better leads.” The full B2B Google Ads playbook covers the nuances that separate B2B-specialist agencies from generalists.
How long does it take to see results from a Google Ads agency?
Honest answer: 60–90 days before you can evaluate performance with statistical confidence, assuming the account is properly structured and measurement is set up correctly. Month one is typically audit, restructure, and measurement fixes. Month two is Smart Bidding learning and early optimization. Month three is when you have enough data to make meaningful decisions. Any agency promising “results in 30 days” is either running a lightly managed account with pre-existing momentum or setting you up for disappointment.
What’s the difference between a Google Partner and a Google Premier Partner?
Google Partner status requires meeting a spend threshold (currently $10,000 across managed accounts over 90 days), maintaining certification, and hitting performance benchmarks. Premier Partner status is reserved for the top 3% of agencies in a given country by spend and performance. Premier status is a stronger signal — but still not sufficient on its own. You still need to ask all the same questions. Some excellent boutique agencies aren’t Premier Partners because they work with fewer, higher-touch clients rather than scaling on volume.
Should I hire a specialist agency or a full-service agency for Google Ads?
For Google Ads specifically, specialist agencies almost always outperform the PPC team inside a full-service shop. A dedicated Google Ads agency has people who spend 100% of their time on paid search. A full-service agency’s PPC team is often competing internally for attention with SEO, social, email, and creative. If Google Ads is your primary performance channel, go specialist. If you need tight integration across paid search, paid social, and SEO, vet the full-service agency’s paid search team specifically — not just the agency as a whole.
What questions should I ask a Google Ads agency on the first call?
Start with: Who manages my account day-to-day? How many accounts does that person manage? How do you handle conversion tracking setup? What’s your approach to negative keywords and search term review? Can I see an example report from a current client? What would you do in the first 30 days? And: what’s a campaign that didn’t work and why? Those seven questions will tell you more than a two-hour presentation.
Not Sure If Your Current Agency Is Actually Performing?
If you’re already working with an agency and something feels off — results are plateauing, reporting is vague, your account manager seems to be reading from a script — trust that instinct.
A real agency doesn’t hide behind complexity. They explain what they’re doing and why, they show you the data behind every decision, and they have a clear answer when you ask “what did you actually change this month?”
The minimum standard: your agency should be reviewing your search terms report weekly, your conversion data should be clean and attributable, and you should be able to trace every dollar of spend to a business outcome.
If they’re not doing those things, it’s worth a second opinion. We audit Google Ads accounts every week — and we tell you exactly what we find, whether you hire us or not. Request a free account audit here.