Table of contents
Performance Max is a Google Ads campaign that shows your ads across Search, YouTube, Maps, Gmail, Discover and websites from one campaign, with Google choosing where the money goes. It learns from your conversions, so it works best once an account has a steady flow of real enquiries and the budget to keep it fed. For most local firms that means starting on Search and adding Performance Max once Search is filling the diary.
What is Performance Max?
Performance Max is one campaign that can show ads everywhere Google sells space. Google's help page, checked on 12 November 2026, calls it "a goal-based campaign type that allows you to access all Google Ads inventory, including YouTube, Display, Search, Discover, Gmail and Maps, from a single campaign."
You do not choose search terms or placements as you do on a Search campaign. You give Google a conversion goal, a budget, headlines, descriptions, images, videos and your website, and Google builds the ads and bids wherever it predicts a conversion.
| Search campaign | Performance Max | |
|---|---|---|
| Where ads show | Mainly Google search results | Search, YouTube, Maps, Gmail, Discover and the Display Network |
| What you choose | The searches you pay for, the ads and the page for each | Goals, budget and creative; Google chooses the rest |
| What it needs to work | A good page and a sensible list of searches | Steady conversion data and plenty of creative |
| Quality score | Shown for each search term | Not shown |
| Best fit for a local firm | The starting point | An addition once Search is producing steady enquiries |
Google positions it as an addition to Search: the same page says it can "complement your keyword-based search campaigns", and that a Search campaign with an exact match for the search is "prioritised to serve over Performance Max".
Why does Performance Max need so many conversions?
Performance Max bids from your conversion data, so with little data it has little to go on. As Google's lead generation page puts it, "AI is only as good as the inputs it receives."
Google does not publish a minimum number of conversions for Performance Max. The nearest figure is in its general lead generation guidance, checked on 12 November 2026, which says to choose a conversion action that "generated at least 15 conversions in the last 30 days at the account level." Its Performance Max lead generation page uses the same 15 in 30 days when advising which goal to bid towards.
For budget, there is no fixed figure either. When you set up a campaign, Google's budget panel suggests up to three daily budgets (low, medium and high) for that campaign, and calls the low one "the minimum recommended budget for your campaign". Its troubleshooting page warns what happens when the budget is tight: "If limited by budget, the AI might find cheaper inventory (like YouTube or Display) to maximise conversions within your constraints." For a plumber or an accountant, cheap display clicks are rarely where the work comes from.
Then there is time. Google's best practice page says to "allow the campaign to run for at least six weeks", and to make no changes for 7 to 14 days after any major adjustment, because changes to budget, bids or assets "reset the campaign's learning phase".
What that means in pounds: a worked example
The business and figures here are made up to show the sums. Say Priya runs a commercial cleaning firm in Birmingham. Her Search campaign spends five hundred pounds a month and each enquiry costs her about eighty pounds, so she gets about six enquiries a month.
To reach Google's 15 a month at the same cost per enquiry, her account would need to spend about twelve hundred pounds a month. Six weeks at that level is roughly one thousand seven hundred pounds before she could judge a Performance Max test fairly. At six enquiries a month, Priya is better off putting her next pound into Search, where she chooses the searches and sees what each one costs. For click prices by trade, see how much Google Ads cost.
Why do Performance Max campaigns bring in spam enquiries?
Performance Max finds more of whatever you tell it counts as a conversion. If a junk form fill counts the same as a real customer, it will look for more junk, and it reaches well beyond search results into apps and websites where people are not looking for a tradesperson. Spam form fills are a common complaint from service firms in forum threads, and Google's own guidance includes steps to reduce them.
Google's Performance Max lead generation page, checked on 12 November 2026, says: "To improve lead quality and reduce spam from forms, consider adding qualifying questions, implementing reCAPTCHA on your landing page or forms and using server-side validation." Here is how that turns into a checklist for a local firm:
- Count only real enquiries. Form submissions and calls long enough to be a real conversation, never clicks on directions or page views. Our guide to conversion tracking shows how.
- Tell Google which enquiries turned into work. Google recommends enhanced conversions for leads or offline conversion imports, uploaded "regularly, ideally daily", so the campaign learns from paying customers instead of form fills.
- Use Google's enquiry goals. Google says goals such as 'Request quote', 'Qualified lead' and 'Converted lead' give you "enhanced protections against invalid lead activity".
- Protect the form. reCAPTCHA, a qualifying question (postcode, type of job) and checks on the server that reject nonsense.
- Show ads only to people in your area. Google says that if enquiries come from outside your area, change location targeting from 'Presence or interest' to 'Presence'.
- Keep it on the right pages. If ads land on pages that cannot win you work, Google suggests turning off Final URL expansion, which otherwise lets Google pick a different page from your site.
If you cannot do the first two, Performance Max will struggle to tell a real customer from a bot. That is the strongest reason to wait.
How do brand exclusions stop Performance Max taking credit?
Brand exclusions keep Performance Max off searches for your own business name, where it would otherwise spend on people already looking for you and count their enquiries as its own.
Google is open about this: its August 2025 update says "Performance Max is designed to find performing Search traffic for your brand." People searching your name would usually have found you anyway, so those conversions flatter the campaign.
Google's help page, checked on 12 November 2026, says that for Performance Max, brand exclusions "apply to only Search, Shopping and YouTube search inventory". You add a brand list under Brand exclusions in the campaign settings, and if your name is not in Google's list there is a Request a brand option. Negative keywords on your name also work, but Google says brand exclusions do better because they block misspellings too.
What reporting do you lose and what do you get?
You lose the line-by-line control Search gives you: no bid for one search, no quality score, no tying one ad to one search and one page. Google decides which channel gets the money, and its own guidance says channel averages "can be misleading", so judge the campaign as a whole.
You do get more than you used to. Google's August 2025 update says search terms reporting is now available "for all Performance Max campaigns", alongside campaign-level negative keywords. The reports worth knowing:
- Search terms report: the searches that triggered your ads, with the landing page used. Block irrelevant ones as negative keywords; Google notes "there can be a reporting lag".
- Channel performance report: how much each channel, from Search to the Display Network, contributes.
- Asset reporting: conversions, cost and clicks for each headline, image and video.
- Placement reports: the websites and apps your ads appeared on, so you can exclude poor ones.
Google's About page, checked on 12 November 2026, also says Search partners and the Display Network "can be configured with separate priority tiers and optional daily budget allocations". That gives you some say over the channels furthest from someone searching for your service.
When is it time to test Performance Max?
When Search is working and has stopped finding more. Test it when all of these are true:
- Search produces a steady flow of enquiries, and at least Google's 15 conversions a month on the action you want to bid towards.
- Your tracking counts real enquiries only, and ideally feeds back which ones became jobs.
- You can fund at least six weeks on top of your Search budget, at or above Google's low budget suggestion, without touching it.
- You have images and ideally your own video. Google says that if no videos are added, "our system may automatically create them".
- You have added brand exclusions and set location to Presence before launch.
Run it beside Search, never in place of it, and compare it on cost per real enquiry and jobs won. If it brings cheap form fills that never answer the phone, switch it off. We set up and run Performance Max as part of our Google Ads management, and for the reasons above we start most local firms on Search.
Common questions
Is Performance Max good for small businesses?
It can be, once there is enough data. Google asks for a conversion action with at least 15 conversions in the last 30 days, and a six-week run. A local firm spending a few hundred pounds a month rarely gets there, so Search is the better start, with a page per service as our guide to quality score explains.
How long does Performance Max take to learn?
Google's lead generation page says "at least one to two weeks (or up to six weeks for more complex setups or low conversion volume)", and its best practice page says at least six weeks. A local firm with few enquiries should plan for six.
Does Performance Max show on Google Maps?
Yes. Google lists Maps among the channels Performance Max serves on, alongside Search, YouTube, Discover, Gmail and the Display Network. You cannot pick Maps alone; Google decides how much of the budget goes there.
What to do this week
Check what your account counts as a conversion and how many real enquiries it recorded in the last 30 days. If the answer is under 15, or includes clicks on directions and phone numbers, fix the tracking and put your effort into Search for now. If you are well past it, add brand exclusions, protect your forms and plan a six-week test. Our step-by-step setup guide covers building the Search campaign first, and our guide to Google Ads for small businesses shows where Performance Max fits in the wider plan.