Performance Max is Google’s campaign type that runs across Search, Maps, YouTube, Display, Gmail and Discover from one budget, with Google deciding where the money goes. For an online store with a clean product feed it is often the best campaign in the account. For a service business generating leads, it is either excellent or an expensive way to collect spam, and the difference is almost entirely about what you feed it.
Why is lead generation the hard case?
Because the campaign optimises toward whatever you tell it a conversion is. A store tells it “purchase” and the signal is clean. A plumber tells it “form submitted”, and the campaign learns, correctly, that the cheapest way to get forms submitted is to show ads to people who fill in forms. Some of those are customers. Many are bots, job seekers and suppliers. The campaign reports success while the phone stays quiet.
When does it work for a service business?
When three things are true. You have meaningful conversion volume, dozens of real leads a month rather than a handful, so the system has something to learn from. Your conversion tracking counts qualified leads, not raw form fills, which usually means importing outcomes from your CRM back into Google Ads or at least firing the conversion only after basic validation. And you have genuine creative assets: real photos, a short video, headlines written for a person. Given those, PMax finds people in places a Search campaign never reaches, and for a client with clean tracking we regularly see it deliver qualified leads at or below the Search cost.
Where does it eat budget?
Brand traffic. Left alone, PMax will happily take credit for people who searched your business name and were always going to convert. Brand exclusions are available; use them.
Irrelevant intent. Account-level negative keywords now apply to PMax, so the job-seeker and DIY terms you have spent years excluding from Search should be excluded here too.
No feedback loop. If a bad lead and a good lead look identical to Google, the campaign cannot tell them apart. This is the root cause of most PMax disappointment, and it is a tracking problem, not a campaign problem. We covered the qualification side in fewer leads, more revenue.
What guardrails should be in place?
One asset group per service, not one for the whole business. Search themes that reflect what a customer types, not your internal service names. A Search campaign running alongside it on your proven terms, so you can compare cost per qualified lead honestly rather than trusting one report. A weekly look at the insights and placements. And a decision, written down in advance, about what result in six weeks means “scale” and what means “stop”. Our Ad Spend Health Check is built to surface exactly the numbers that decision needs, and the structure principles in structuring a Google Ads account still apply.
The uncomfortable part
If your tracking cannot tell a real enquiry from a fake one, do not run Performance Max yet. Fix the tracking, run Search on tight terms, and revisit in a quarter. The campaign is not the problem; it is doing precisely what it was told. That is what our Google Ads management team checks before it turns anything on.
Frequently asked questions
How much conversion data does Performance Max need?
Can I stop PMax stealing my brand traffic?
Should a small service business run Performance Max at all?
Want this looked at properly? Book a free strategy session and we will walk your numbers with you, with honest advice and no obligation.
