How to Evaluate a Google Ads Agency Before Hiring: The Buyer’s Checklist That Filters Out the Pretenders

Most agencies will say all the right things on a sales call. They’ll mention ROAS, smart bidding, “holistic strategy,” and whatever else they think you want to hear. Then you sign, pay the onboarding fee, and spend the next four months wondering why nothing is improving.

The problem isn’t that bad agencies are hard to spot — it’s that most buyers don’t know what to actually ask. This checklist fixes that. Use it before you sign anything.

Start With Access: Who Owns the Account?

Before you ask about strategy or results, ask this: “Will the Google Ads account be created under my Google account, or yours?”

If the answer is “ours,” walk away. Agencies that own the account have structural leverage over you — when you leave, you leave with nothing. No historical data, no conversion history, no audience lists. You’re starting from zero, which is exactly how they like it.

The account should be created in your Google Ads account (your MCC or your own login), with the agency granted manager access. That’s non-negotiable. Any agency worth hiring will agree immediately, because they’re not trying to hold your data hostage.

Ask the same question about your landing page assets, your tracking setup, and any scripts they install. Everything they build for you, on your budget, should belong to you.

The 7 Questions That Reveal Whether They Actually Know What They’re Doing

You don’t need to be a PPC expert to ask these. You just need to listen carefully to the answers — and notice when an agency gets vague or pivots to a sales pitch instead of actually answering.

1. “How do you handle Performance Max, and what visibility do you give clients into where spend is going?”

PMax is the single most opaque campaign type in Google Ads right now. Google bundles search, display, YouTube, Gmail, and Shopping into one black box and calls it “efficiency.” A good agency will tell you exactly how they use asset group segmentation, search term reporting workarounds, and audience signals to maintain some control over where budget flows. A bad one will say “PMax works great, Google’s algorithm is really smart.”

If they can’t explain their PMax governance strategy in concrete terms, they don’t have one.

2. “Walk me through how you structure Smart Bidding oversight — specifically, what human decisions are you making that the algorithm can’t?”

AI bidding (tCPA, tROAS, Maximize Conversions) is powerful, but it requires human oversight to stay profitable. Good agencies monitor target adjustments relative to actual conversion data, catch seasonality issues before the algorithm reacts too slowly, and know when to override automated decisions. Smart Bidding is only as good as the signals you feed it — and those signals require constant human curation.

If an agency implies they just “set the target and let Google optimize,” your budget is on autopilot with no pilot.

3. “How do you approach negative keyword management, and how often do you review search term reports?”

Negative keywords are where lazy agencies leak your money in silence. Ask specifically: “Do you review search term reports weekly or monthly?” Monthly is borderline acceptable for low-volume accounts. For anything spending $5K+/month, it should be weekly. Ask what their process is for building out negative keyword lists from the first week of data.

4. “What conversion actions are you optimizing toward, and how do you verify they’re tracking correctly?”

This is where you’ll expose a shocking number of agencies. Many optimize toward whatever conversion action was easiest to set up — including things like “page views” or auto-imported GA4 goals that fire on every session. Ask them to explain, specifically, what conversions they’d track for your business model and how they’d verify the tracking is firing correctly before spending a dollar. If they can’t describe a basic QA process, your campaign will run on junk data from day one.

5. “Can you show me an example of a test you ran for a similar client, what the hypothesis was, and what you learned?”

Agencies that actually run structured experiments and A/B tests can answer this immediately. They’ll tell you they tested bid strategy X vs. Y, what the holdout was, how long they ran it, and what the lift was. Agencies that don’t test will pivot immediately to vague statements about “ongoing optimization.” Ongoing optimization without a testing framework is just guessing with extra steps.

6. “What does your reporting look like, and will I always know where my money is going?”

Ask to see a sample report. Not a pitch deck — an actual client report. Good reporting shows spend by campaign, conversion volume with cost per conversion, impression share on branded terms, search term coverage, and clear notes on what changed and why. If their reporting is a screenshot of the Google Ads dashboard with no commentary, you won’t know if things are good, bad, or quietly disintegrating.

7. “What are you watching for that would tell you the strategy needs to change?”

This separates strategic thinkers from account babysitters. A great answer sounds like: “We watch for conversion rate drops at the landing page level separately from the ads, because we want to know if it’s a creative problem or a page problem. We also monitor impression share losses — if we’re losing share on our top converting keywords, that’s a flag that we need to re-evaluate bids or budget allocation.” A bad answer sounds like “We watch the ROAS and adjust accordingly.”

Red Flags That Should End the Conversation

Some of these seem obvious. You’d be surprised how often they get ignored because the sales rep is charming and the deck is slick.

They guarantee results. No legitimate agency guarantees a specific ROAS, CPL, or number of leads. Google Ads operates in a competitive real-time auction. Anyone guaranteeing outcomes is either lying or has no idea how the platform works.

They lead with Google’s partner badge. Being a Google Partner means you’ve met minimum spend and certification thresholds. It does not mean the agency is good. Google has a strong financial incentive to call as many agencies “partners” as possible. Treat the badge as table stakes, not a credential.

Their pricing is percentage-of-spend only. A straight percentage-of-spend model (typically 10–15%) creates a direct incentive to increase your budget — not your returns. The best agencies use hybrid models that tie some portion of compensation to performance. At minimum, ask how they handle budget recommendations and whether their fee structure rewards efficiency or spend volume. Our guide to Google Ads agency pricing breaks down exactly what fee structures to expect and which questions to ask before you sign.

They can’t tell you who will actually work on your account. Many agencies win business with senior strategists and hand accounts off to junior coordinators. Ask directly: “Who will manage my account day-to-day, and what is their experience level?” Get a name. Ask to speak with that person.

They can’t speak to your industry specifically. A generic Google Ads pitch that could apply to any business is a sign of a generalist shop running templated campaigns. Ask: “Have you worked with [your industry] clients before, and what are the specific challenges in that space?” If they’ve never run campaigns for a business like yours, that’s not disqualifying — but they should acknowledge the learning curve honestly, not pretend it doesn’t exist.

They dismiss the signs of underperformance you’ve already noticed. If you come in saying “our CPCs have been rising for three months,” and the agency says “that’s just how the market is” without asking a single diagnostic question — they’ve already told you how they’ll respond to problems once you’re a client. For a deeper look at what real performance problems look like, see our article on signs your Google Ads agency isn’t performing.

What Benchmarks and Deliverables to Demand Before Signing

Before contracts, ask the agency to commit — in writing — to specific operational standards. Not outcome guarantees. Process standards.

Search term reviews: Weekly for accounts over $3K/month. Bi-weekly absolute minimum for anything smaller.

Negative keyword list updates: Monthly additions minimum, with documentation of what was added and why.

Branded campaign impression share: They should be targeting 85–95% impression share on your brand terms. If a competitor is running conquest campaigns against you and your agency isn’t defending, that’s a tactical failure.

Account access: You should have admin access to your own account at all times. Not view-only. Admin.

Communication cadence: Ask specifically what you get: weekly summary emails, monthly strategy calls, or something else? Who do you call if something’s wrong at 9am on a Monday? Get that answer before you’re in that situation.

Onboarding timeline: A good agency can tell you exactly what happens in the first 30 days. Audit, tracking verification, campaign restructuring, launch. If their onboarding plan is vague, their execution will be too. Our guide on what to expect in the first 90 days with a Google Ads agency gives you a detailed benchmark for every phase.

The 2026 Questions You Must Ask: AI Oversight and Channel Expansion

The Google Ads landscape in 2026 is fundamentally different from what it was two years ago. Smart Bidding and AI campaign management are no longer optional features — they’re the default. And ChatGPT Ads launched as a self-serve advertising platform this year, creating a genuinely new channel that any serious paid search team should have a formed opinion on.

Ask these questions specifically:

“How do you audit and override AI bidding decisions when they’re wrong?” This is the central skill gap in agency PPC management right now. The algorithm makes mistakes — it over-weights low-quality conversions, it reacts too slowly to competitive changes, it misreads seasonal patterns. Ask what the agency’s process is for catching these mistakes and correcting course without blowing up campaign learning.

“What’s your current position on Performance Max vs. standard Shopping or Search campaigns for accounts like mine?” The right answer depends on your business, but any agency should have a clear framework. “We always use PMax” and “we never use PMax” are both red flags. The right answer involves account-specific tradeoffs.

“Do you have experience with ChatGPT Ads, and how do you think about it alongside Google for a business like mine?” You’re not necessarily looking to run ChatGPT Ads tomorrow. But you want to know if your agency is paying attention to where paid search is heading. An agency that’s never heard of it, or dismisses it entirely, is already behind. The channel is live, self-serve, and increasingly relevant — especially for B2B and high-consideration purchases. If you’re curious about how the two platforms compare, our honest comparison of ChatGPT Ads vs. Google Ads breaks down the key differences in intent, targeting, and cost structure.

The Due Diligence You Should Do on Your Own

Don’t take their word for any of it. Here’s what to verify independently before signing:

Check their own Google Ads. Search their brand name and a few competitive terms in their space. How do their ads look? If an agency’s own paid search presence is mediocre, that tells you everything about how they prioritize craft.

Read their content. Does their blog or resource center actually contain specific, opinionated advice — or is it generic SEO filler? Agencies that understand Google Ads write about it with specificity. If their content could have been written by someone who’s never logged into an account, take that seriously.

Ask for references and actually call them. Not email — call. And ask specific questions: “Was there a period where performance dropped, and how did the agency handle it?” “Did you always know where your budget was going?” “Would you hire them again, and why?” The answers to those three questions tell you more than any case study deck.

Ask to see a real audit. Many agencies offer a free account audit as part of the sales process. Take them up on it. A genuine audit surfaces real problems with specific data. A fake one is a slide deck saying “we found significant opportunity to improve your ROAS.” If they can’t show you what’s actually wrong in your account before you hire them, they probably can’t find it after either.

Frequently Asked Questions

How long should Google Ads agency vetting take?

Plan for two to three weeks minimum. That means an initial call, a follow-up with the account manager who’d actually run your campaigns, an audit presentation, reference calls, and contract review. Agencies that pressure you to sign faster than that are betting you won’t slow down enough to do due diligence.

What questions should I ask a Google Ads agency about their team structure?

Ask specifically: how many accounts does each account manager handle? The industry average is high — some agencies run 30–40 accounts per manager. Best-in-class agencies cap it at 10–15 for meaningful strategic attention. Also ask whether the person presenting to you is the person who’ll work on your account. Bait-and-switch after signing is common.

How do I evaluate a PPC agency if I don’t know much about Google Ads myself?

Focus on process, not outcomes. Ask how they’ll communicate with you, what reports you’ll receive, who to contact when something is wrong, and what access you’ll have to your own account. These questions don’t require technical knowledge, and the answers tell you a huge amount about how the relationship will actually work. If something feels evasive or rehearsed, it probably is.

Should I ask for case studies during agency due diligence?

Case studies are useful but limited — every agency only shows their wins. Ask instead for a case study of a campaign that underperformed, what went wrong, and what they changed. That answer reveals more about an agency’s accountability and problem-solving than any polished success story.

What contract length is reasonable for a Google Ads agency engagement?

Three months minimum is fair — Google’s Smart Bidding algorithms need time to accumulate conversion data, and no agency can demonstrate results in 30 days. But be wary of 12-month lock-ins with no performance clauses. A reasonable contract is 3–6 months with a 30-day exit clause after the initial term. If an agency only offers annual contracts with no outs, ask why.

Is it a red flag if an agency only specializes in Google Ads?

Not necessarily — specialists are often better than generalists. What matters is whether they have a clear, informed opinion about other channels (Meta, Microsoft Ads, ChatGPT Ads) and how Google fits into your broader paid media mix. An agency that only knows Google and has never thought about channel diversification may give you advice that ignores what’s happening in the broader paid search landscape.