The right questions to ask a Google Ads agency before you sign are the ones that expose how they will handle B2B SaaS specifically — long sales cycles, CRM-based conversions, and a buyer who takes weeks to decide. Five areas separate a specialist from a generalist: account ownership, offline-conversion attribution, fee incentives, who actually runs the account, and what the reporting ties back to. This is the vetting scorecard: the questions grouped by what they reveal, and the answers that should reassure you versus the ones that should end the conversation.
Vetting matters more than it used to because the cost of a bad fit has risen. B2B SaaS customer acquisition costs now commonly land at $1,500-$4,500 for mid-market and $5,000-$15,000+ for enterprise, and an agency optimising to the wrong metric can burn a quarter of budget before the mismatch shows up in pipeline. Use these questions on the pitch call, and treat evasive answers as data.
Ownership and access: do I control my own account?
Start here, because it determines what happens when the relationship ends. Ask: will the Google Ads account be created under my own Google Ads ID with me as admin, or inside your manager account? The reassuring answer is that the account is yours and the agency is simply linked as a manager — you keep the account, its history, and its conversion data whatever happens. The answer that should worry you is any version of “we'll set it up in our MCC,” which can leave you starting from a blank account with no conversion history if you ever leave. Full visibility should be standard: you should be able to log in and see everything yourself, not receive a filtered monthly deck.
Ask the same question about GA4, your tag manager, and billing — billing in particular should be attached to your business, not the agency's. This is not paranoia; it is the difference between a clean exit and a costly one. If you want the full picture of what a bad ownership setup does to a transition, our guide on switching Google Ads agencies walks through the account-migration traps in detail.
Attribution: can you optimise to pipeline, not just leads?
This is the question that most cleanly separates a B2B SaaS specialist from an e-commerce generalist. Ask: can you feed offline conversions back from my CRM, so bidding optimises to SQLs and closed-won rather than raw form fills? For a business with a multi-week sales cycle, this is not optional — without offline conversions, the algorithm does not know which lead became a deal and which turned into nothing, so it optimises toward whatever generates the most cheap leads regardless of quality.
A strong agency will describe a concrete stack: GCLID capture on the form, storage in the CRM, and offline-conversion import (or an equivalent API feed) that sends lead-stage and revenue signals back to Google Ads. A weak one will talk only about form conversions and on-site events. Ask how they define success and what metric they bid toward — the answer should be cost per SQL or value-based bidding to pipeline value, not cost per lead. Our breakdown of measuring pipeline from Google Ads is the standard you are holding them to.
Waste control: show me your negatives and your search-terms discipline
Ask to see a sample negative-keyword list for your vertical, and ask how often they review the search-terms report. This is a fast, concrete test of whether an agency actually manages accounts or sets them and forgets them. By one estimate, a large share of B2B accounts waste budget on irrelevant queries, and a serious B2B SaaS account typically starts with 200-plus negatives to fence off job-seekers, students, free-tool hunters, and adjacent-but-wrong intent.
The reassuring answer is a specific cadence — weekly or biweekly search-term mining, a shared negatives library, and examples of the kinds of queries they cut for other SaaS clients. The worrying answer is a vague “we monitor it” with no artifact to show. An agency that cannot produce a vertical-specific negatives list on request has probably never built one.
Incentives: how do you make money, and does more spend pay you more?
Ask the fee question directly and without apology: how are your fees structured, and do you earn more if I spend more? Percentage-of-spend pricing quietly rewards the agency for growing your budget, which is a problem when what you need is efficiency rather than volume. A flat retainer — commonly $2,000-$5,000 per month for a mid-market B2B SaaS account — pays for expertise regardless of spend, so the agency's incentive is to make the budget work harder.
Neither model is inherently dishonest, but you should understand the incentive before you sign and watch for behaviour that follows the money. If a percentage-fee agency keeps recommending budget increases without a matching improvement in cost per SQL, the incentive is showing. Our teardown of Google Ads agency pricing for B2B SaaS compares flat-fee and percentage models across budget tiers so you can spot which one you are actually being offered.
Team and reporting: who runs this, and what will I see?
Ask who will manage your account day to day, and insist on meeting that person before signing. The salesperson running the pitch is rarely the one who optimises the account. A good answer names a specific senior strategist with B2B SaaS experience who carries a limited book — around eight accounts — so they can actually think about yours. A bad answer is a vague “our team” or a named senior who quietly hands you to a junior after the contract is signed. Account-manager churn is one of the most common hidden failures in agency relationships, so ask about it explicitly.
Finally, ask what the reporting ties back to and request a redacted sample from a current client. You want to see cost per lead, cost per SQL, and pipeline sourced trended over time — with a clear account of how CRM data flows back in — not a dashboard of clicks, impressions, and platform conversions. If they cannot show pipeline-linked reporting, they are not set up for B2B measurement. Once you have run every candidate through these questions, the natural next step is an independent read on your account: a structured Google Ads audit gives you a benchmark to hold any agency to, and the free 10-point audit checklist lets you pressure-test the setup before your first call. For the surrounding decisions, see our guides on hiring a Google Ads agency and the top SaaS Google Ads agencies.
