A home services company in Laval turns on Performance Max, and Google's dashboard reports a 6x return within the first month. Budget goes up. Three months later, a closer look shows most of that reported return was traffic that would have converted anyway — branded searches, existing customers, and direct visits Google's attribution model folded into the campaign's numbers. This is the central tension in Performance Max advertising right now: the format sits inside nearly every advertiser's account by default, but new data on what it actually adds, versus what it simply reallocates from channels that were already converting, is far more mixed than the campaign dashboard's own ROAS figure suggests.

What Performance Max Actually Automates

Performance Max is a single campaign type that runs across every major Google inventory source at once — Search, Display, YouTube, Gmail, Discover, and Google Maps — using one shared budget and one automated bidding strategy. Instead of building separate campaigns per channel, an advertiser uploads ‘asset groups’ — headlines, descriptions, images, videos, and business logos — and Google's machine learning models decide, per auction, which combination to show, on which surface, to which user. The trade a business makes for that convenience is control: there is no channel-level budget split, no default search term report, and no way to see exactly which surface produced a given conversion without exporting data through a third-party tool.

Performance Max vs. Search vs. Local Services Ads

For a local service business already running Google Ads, the practical question is not whether Performance Max works, but which of the three main campaign formats — Performance Max, a dedicated Search campaign, or Local Services Ads — deserves which share of budget:

The Real Overlap Data: How Much Does Performance Max Duplicate Search

A 2025 Adalysis study analyzing more than 3,300 non-retail Performance Max campaigns and roughly 1.2 million search terms found individual term-level overlap with active Search campaigns was low, at just 2.8%. But at the campaign level, 67% of Performance Max campaigns showed at least some overlap with a Search campaign on one or more terms, and Search Engine Land's reporting on the same dataset noted that when both campaign types were eligible to serve on an identical search term, Search ads won on click-through rate 65% of the time and converted at a higher rate. In plain terms: the overlap that does happen tends to favor the channel Performance Max is nominally supposed to be adding incremental volume to, not replacing it.

Where Performance Max Wins for Local Service Businesses

The category where Performance Max earns its budget most reliably is exactly the one most FutureSource clients operate in. Growth Conductor's 2026 PPC benchmark report puts average Performance Max ROAS for local service businesses at roughly 3.5x — meaningfully ahead of many other verticals — because local intent signals give Google's bidding models a stronger conversion signal to optimize against than a typical retail catalog: call extensions, a synced business location feed, proximity to a defined service area, and after-hours emergency search behavior all give the automation something concrete to target. A plumber, an electrician, or a déneigement contractor generates exactly the kind of urgent, location-anchored intent Performance Max's algorithm is built to chase.

Where Performance Max Wastes Budget

A separate 2025 analysis by Groas covering 247 accounts and a combined $18.7 million in spend found Performance Max outperformed Search in 58% of accounts, with Search still winning in the other 42% — and the deciding factor was not campaign sophistication but how tightly brand terms and repeat-customer traffic were excluded before the comparison ran. Left unchecked, Performance Max readily bids on a business's own brand name and on visits from people who already had an appointment booked, then reports both as new conversions. That inflates the dashboard ROAS while adding almost nothing the business would not have gotten anyway through organic search, direct traffic, or a phone call from an existing customer.

The Black-Box Problem: Why You Can't See What's Working

Performance Max does not provide a full search term report the way a Search campaign does, and placement-level reporting is limited to a rough insights panel rather than a line-by-line breakdown of where each ad actually appeared. An asset group's ‘performance rating’ — Low, Good, Best — is a relative signal, not a diagnosis, and it will not tell a business owner whether a strong number is coming from YouTube brand-awareness views, a Display placement on an unrelated site, or an actual local Search query. Diagnosing a Performance Max campaign properly generally requires a third-party auditing tool such as Adalysis or Optmyzr, because the native Google Ads interface was not built to expose the level of detail a Search campaign gives by default.

Setting Up Performance Max Correctly

The setup work that determines whether Performance Max adds revenue or just reshuffles it happens before the campaign ever launches:

• Build an account-level negative keyword list covering your brand terms — as of 2026, account-level exclusions are the only negative-keyword lever Google gives Performance Max advertisers, since it does not support campaign- or ad-group-level negatives the way Search does
• Request a formal brand exclusion from Google so Performance Max stops bidding on branded search you would already win organically
• Fill every asset slot — multiple headlines, all image ratios, a logo, and at least one uploaded video — since Google auto-generates video from static assets when none is provided, and it rarely performs as well
• Add 5–15 specific search themes per asset group that mirror your actual top-converting search terms, rather than leaving the field broad
• Feed real conversion data back in through offline conversion imports or enhanced conversions, so the bidding algorithm optimizes toward booked jobs and closed revenue, not just form fills or calls that never converted

Budget Allocation and Measuring Real Incremental Return

Handing Performance Max 100% of a Google Ads budget removes the one control that protects a business from paying for its own brand traffic: a dedicated Search campaign. A more defensible split starts Performance Max at 20–30% of total spend alongside an existing, well-tuned Search campaign, then scales the Performance Max share only as its exclusions are proven and its results hold up under an incrementality test — most commonly a geo-lift or holdout test that pauses Performance Max in a subset of service areas and compares booked revenue against areas where it kept running. That comparison, not the ROAS number on the campaign dashboard, is the only reliable way to know whether Performance Max is generating new jobs or simply taking credit for ones that were coming in anyway.

Performance Max for Montreal and Quebec Service Businesses

Quebec's bilingual market adds a layer Performance Max was not built to handle automatically. Asset groups should be built and targeted separately by audience language rather than mixed into one bilingual group, since a French headline paired with an English image by Google's automated assembly can undercut the coherence that drives a francophone searcher to click. Seasonal Quebec service categories — déneigement in winter, paysagement and toiture in summer — also need budget paced to the actual demand curve rather than the flat daily budget Performance Max defaults toward, since the algorithm needs several weeks of consistent conversion data each season to relearn a business's intent signals before it can bid efficiently again. Businesses that pause and restart Performance Max heavily between seasons should expect a real efficiency dip for the first one to two weeks of each new season while the model re-learns.

The GEO Angle: Automated Bidding in an AI-Driven Search World

Performance Max already draws on the same machine-learning infrastructure Google uses across AI Overviews and AI Mode, and Google has begun extending similar automation into Search campaigns directly through features like AI Max for Search — broad-match-style automated targeting layered onto keyword campaigns. The practical implication for a local service business is that manual control over exactly which query triggers an ad is shrinking across the entire Google Ads platform, not just inside Performance Max, which makes the account-level exclusion and offline conversion habits described above more important over time, not less. A business with clean first-party conversion data feeding its campaigns will get more accurate automated bidding as Google's AI systems expand; a business without it will get automation optimizing against noise.

Our Approach for Clients

When we build Performance Max into a client's account, it goes in alongside an existing Search campaign, never in place of one, with an account-level brand exclusion and negative keyword list set before the first dollar spends. We connect offline conversion imports back to the CRM so the bidding algorithm optimizes toward booked jobs rather than form submissions, and we run a geo-lift holdout test in the first 60 days to establish real incremental lift before recommending any budget increase. For bilingual Quebec accounts, we build separate French- and English-targeted asset groups from the start, rather than retrofitting the split after a mixed group has already spent its way to a misleading average.

Getting Started This Month

If Performance Max is already running in your account, start by checking whether an account-level brand exclusion exists — most businesses that skip this step are paying to win searches for their own name. If it is not yet running, the safer entry point is a 20% test budget alongside your existing Search campaign, with offline conversion tracking connected before launch, not after. Performance Max can be a genuinely strong channel for a local service business; it is only a wasteful one when it runs unmeasured.