Most service businesses that have been burned by a Google Ads agency were not burned by an obviously bad one. They were burned by an average one: an agency that ran the campaigns, sent monthly reports, took the retainer, and quietly let performance drift because nobody was held accountable to the outcome that actually mattered to the business.
Choosing the right agency is harder than it looks because the surface signals (case studies, client logos, fancy dashboards) do not tell you much about day-to-day quality. The things that actually matter are harder to see from the outside.
This guide covers what to look for, what the red flags are, and the specific questions worth asking before you sign a contract. If you are still deciding whether an agency makes sense at all, start with whether a Google Ads agency is worth it first.
The Short Answer
- Lead-gen is a different skill set from e-commerce. An agency that excels at shopping campaigns and ROAS optimization may not know how to build a lead-gen account around qualified leads and cost per booked job.
- The most important question is who actually manages your account day to day, not who presents at the sales call.
- How an agency talks about tracking tells you a lot. If they count every form fill as equal, they are optimizing for the wrong thing.
- Good reporting is built around your business metrics (CPL, lead quality, pipeline), not agency metrics (impressions, CTR, Quality Score).
- A minimum 3-month commitment is reasonable. Anyone asking for 12 months upfront on a new relationship is worth questioning.
Lead-gen is not the same as e-commerce
The most common mismatch in agency selection is a service business hiring an agency built around e-commerce.
E-commerce Google Ads is about volume, Shopping campaigns, ROAS, and product feed optimization. The feedback loop is fast: someone clicks, buys, and the revenue is directly attributable. The optimization signals are clean.
Lead-gen Google Ads is about qualified enquiries, phone calls, form fills that turn into actual conversations, and a sales process that happens offline. The optimization signal is messier: a form fill is not a customer, and a cheap lead is not a good lead if none of them become jobs.
An agency that optimizes toward the lowest cost per form fill in a lead-gen account will almost always produce the wrong result. You end up with a lot of cheap leads from people who are not serious buyers, while the expensive leads that actually convert into customers get deprioritized.
When evaluating agencies, ask directly: what percentage of your clients are lead-gen service businesses, and how do you distinguish between a form fill and a qualified lead in your reporting?
Keep in Mind: An agency’s case studies should reflect your situation. If their best results are all e-commerce brands and your business generates leads by phone and form, that experience does not directly transfer.
Find out who actually manages your account
There is a consistent gap between who sells an engagement and who delivers it. The senior person who pitches the business and presents the strategy is often not the person who logs into your account each week.
This matters because Google Ads management is highly skill-dependent. A junior account manager following a playbook can maintain a campaign but may not diagnose a structural problem, make smart bid strategy changes, or catch a conversion tracking issue before it costs real money.
Ask directly: who will be the day-to-day manager on my account, and can I speak to them before signing? If the agency deflects this question or tells you that a team manages accounts rather than an individual, that is useful information.
Also ask about account load. A Google Ads account manager handling 30 or 40 clients is in maintenance mode. One handling 10 to 15 is in a position to do real work. The answer gives you a sense of how much attention your account actually gets.
How they talk about tracking tells you everything
The fastest way to understand whether an agency will serve a lead-gen business well is to ask how they handle conversion tracking.
A good agency asks: what happens after someone fills in your form? Do leads go into a CRM? Does your team call them back? How many of the form fills you get actually become customers? They want to understand the full funnel, not just what happens on the website.
An average agency treats every form submission as a conversion, optimizes toward getting more form submissions, and reports a falling cost per lead as a success, regardless of what those leads are worth.
The better approach, and one worth asking about, is optimizing toward lead quality by feeding real outcomes back into Google Ads. This means understanding what conversion actions should count as a lead, and in some accounts, importing offline signals (calls that became appointments, forms that became booked jobs) so Smart Bidding targets the leads that actually convert.
If an agency has never set up offline conversion tracking for a client, they are optimizing with incomplete information.
What good reporting actually looks like
Most Google Ads reports are built around metrics that are easy to pull from the platform: clicks, impressions, CTR, average CPC, Quality Score. These are useful for diagnosing specific problems but they are not what your business runs on.
Good reporting for a lead-gen business is built around:
- Cost per lead, broken down by campaign or service category
- Lead volume over time, with context for changes
- Lead quality indicators (call duration, form fill type, whether the agency tracks any downstream outcome)
- What was tested last month and what changed as a result
- A clear read on what is working and what is not, written plainly
If a prospective agency’s reporting sample is heavy on impression share graphs and Quality Score trends and light on CPL and lead outcomes, their attention is on the wrong layer of the funnel.
Pro Tip: Ask to see a sample monthly report from an existing client (anonymised). This tells you more about how the agency thinks than any case study or sales deck will.
Understand the fee model before you compare prices
Google Ads agencies typically charge one of two ways: a flat monthly retainer or a percentage of ad spend. Both can be reasonable; what matters is what you actually get for the fee and whether the incentive structure aligns with your goals.
Percentage-of-spend models create a quiet incentive to increase your budget, because a bigger spend means a bigger fee. A flat retainer does not have that problem, but it can create a different one: once the account is stable, there is less financial incentive to keep improving it.
The specifics worth clarifying before signing:
- Is the management fee separate from the ad spend, or does it include a budget?
- What does the fee include: campaign builds, landing page support, reporting, tracking setup?
- Are there setup fees for new campaigns or new clients?
- What happens to campaign assets if you leave?
For more detail on what is typical, Google Ads agency pricing structures covers the fee models in detail.
Red flags worth knowing
Some patterns reliably indicate a poor fit or a poor agency:
Guaranteed results. No honest Google Ads agency guarantees specific CPL targets or lead volumes before seeing the account and the market. Guarantees are a sales tool, not a service commitment.
No interest in your sales process. An agency that does not ask how leads are followed up, what makes a good lead, or what the typical deal value is, is not thinking about your business outcomes.
Vague answers about who manages the account. If you cannot find out who specifically will be working on your campaigns, or if you are told “our whole team handles it,” that is a structure built for maintenance, not improvement.
Locking you in for 12 months upfront. A new agency relationship needs time to build trust and results, but long lock-ins on a brand new engagement favour the agency, not the client. A standard minimum of 3 months is reasonable; a year-long commitment before any work has been delivered is not.
Treating all conversions equally. If an agency’s only conversion goal is “more leads,” they are not thinking about lead quality. A business with a 10% lead-to-client conversion rate and a 50% rate has very different campaign requirements, and an agency that does not ask about this cannot optimize for it.
For a full read on the specific warning signs once a relationship is underway, signs your Google Ads agency is coasting covers what to watch for.
What a reasonable minimum commitment looks like
Month one of a new Google Ads engagement is almost always audit, tracking setup, campaign structure, and learning. Real optimization starts in month two and compounds from there. Expecting results in the first 30 days is unrealistic for most accounts.
A minimum commitment of 3 months is standard and fair. It gives enough time to see whether the work is producing results and to make decisions based on actual data rather than early noise.
Some agencies require 6 months minimum. That can be reasonable for complex accounts or highly competitive markets where it takes longer to see meaningful trends. Be sceptical of it on a first engagement with a new agency before you have seen any of their work.
One useful question: what happens to the campaign assets and data if we part ways? Account ownership, creative assets, and conversion history should stay with you. An agency that retains ownership of the Google Ads account itself as a contractual clause is making it harder for you to leave, which is a useful signal about how they operate.
How I handle this When a new client approaches Groove Media, the first call is not a pitch. It is a conversation about their business: what counts as a good lead, what their sales process looks like, what they have tried before, and what went wrong. That context shapes everything from campaign structure to what we report on. The honest answer is that not every business is a good fit for a specialist agency. A business with a budget under €5k/month, no CRM, and no interest in tracking lead quality past the form fill will not get as much from the kind of management we provide. In those cases, I say so. If you are in a position where a specialist agency makes sense and you want a second opinion on whether your current campaigns are set up for the right outcomes, an account review is a good starting point.
Performance marketing specialist for 10+ years.
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