Google Ads for Garages: Should You Run Search Campaigns or Performance Max?
Sooner or later, every garage running Google Ads gets the phone call.
A friendly voice from Google, telling you your account is underperforming, you're missing out on reach, and that if you'd only switch to Performance Max, the AI would find customers you're not currently reaching.
Cue the usual panic.
Am I doing this wrong? Is Search old hat now? Is every other garage in town already ahead of me?
Here's the reassuring bit: not really. Performance Max is a genuinely clever campaign type, and it works brilliantly for some businesses. But for most independent garages spending a few hundred pounds a month within a ten mile radius, a well built Search campaign is still the better tool. Not because the technology is bad, but because of how little room for error a small budget gives you.
Let's unpack what each one actually does.
Search Campaigns: You Pick the Words
This is the version most people picture when they think of Google Ads.
You choose the searches you want to show up for. MOT, car servicing, brake repair, mobile mechanic, clutch replacement. You write the ads. You draw a radius round the workshop. And you add negative keywords to block the searches you don't want to pay for, which for a garage usually means jobs, courses, salaries, parts, DIY guides and anything beginning with "how to".
Then, crucially, you can see what happened. Which search triggered your ad, what it cost, and whether it turned into an enquiry.
You're in charge, and you can check the workings. When something goes wrong, you can actually find it.
Performance Max: You Hand Over the Keys
Performance Max is one campaign that runs across everything Google owns. Search, Display, YouTube, Gmail, Discover and Maps, all out of the same budget.
There are no keywords. Instead you supply assets: headlines, descriptions, images, a logo, ideally a video. You bundle them into asset groups, add a few audience signals to hint at who you're after, set a conversion goal and a budget, and Google's AI takes it from there.
Which channel to appear on. Which person to show it to. Which headline sits next to which photo. What to bid in each auction.
Google describes this as letting the AI find incremental customers. That's a fair description of the intention. It's also a fair description of getting out of the driver's seat.
Search is a scalpel. Performance Max is a net. If what you want is people within ten miles typing "MOT near me", the scalpel usually wins.
So Why Does Google Keep Pushing It?
Because this is the direction Google has been travelling for years, and Performance Max is where the road leads.
Smart Shopping and Local campaigns were folded into it back in 2022. Broad match keywords get promoted alongside automated bidding. Automatically created assets arrive switched on by default. And in 2025, Google launched AI Max for Search, which brings a lot of the same machinery into ordinary Search campaigns.
None of that is a stitch up. Automation genuinely does work well, when it has enough data to learn from.
That last part is the bit the phone call tends to skip over.
The Number That Decides This for Most Garages
Automated bidding learns from conversions. Not clicks. Not impressions. Conversions.
The rule of thumb you'll hear from people who manage these accounts for a living is that an automated campaign wants somewhere around 30 conversions a month before it can optimise properly. Some will work with 15 to 20. It's a practitioner benchmark rather than an official Google threshold, so treat it as a guide, not gospel.
Now count your own.
If a garage on £500 a month is generating eight or ten enquiries, Performance Max is being asked to make decisions across six different channels on the basis of ten data points. It will happily spend the money. It just won't learn very much while doing it.
A Search campaign doesn't have the same problem, because you haven't asked it to work out where your customers are. You've already told it.
That's the real dividing line. Not big business versus small business, but data rich versus data thin.
Three Ways It Goes Wrong on a Small Budget
It quietly buys your own name.
Left unchecked, Performance Max is very good at hoovering up people searching for your garage by name. Those clicks are cheap and they convert beautifully, because the customer had already made their mind up before they typed anything.
Your report looks fantastic. Your diary looks exactly like last month's. Brand exclusions exist precisely to stop this, and they should be switched on from day one.
The money drifts.
Some of your budget will end up on Display and YouTube, in front of someone watching a video rather than looking for a garage. On a national budget, that's a reasonable trade for reach. On £400 a month, it's a serious chunk of your month spent on impressions instead of intent.
You can't see well enough to fix it.
When a Search campaign misbehaves, you open the search terms report and usually spot the problem within a minute. When Performance Max misbehaves, diagnosis is slower and vaguer. And slow diagnosis is expensive when the budget is small.
In Fairness to Performance Max
The 2022 version deserved most of the kicking it got. The current one really doesn't.
You can now add negative keywords at campaign level instead of pleading with a support rep, though the list is capped (currently 100). You can exclude your own brand and named competitors. You can add search themes, up to 25 per asset group, to steer the sorts of queries you want considered. You can switch off final URL expansion so Google stops sending traffic to pages you never nominated. And reporting on search terms, asset groups and channel performance has all improved.
What you still can't really do is cleanly switch off individual channels. If you want Search only, then what you want is a Search campaign.
One caveat worth stating plainly: these controls change constantly. Check the current state of play before you rely on any of them.
What If You Run Both?
Plenty of accounts do, and Google recommends it.
The mechanics are worth knowing. If a search matches an eligible exact match keyword in your Search campaign, that campaign takes priority. Otherwise, Ad Rank decides which of your campaigns gets to show.
For a big account, running both makes good sense. For a garage on £600 a month, splitting that across two campaigns usually means neither of them gets enough data to work properly.
Two hungry campaigns rarely beat one well fed one.
The Middle Option Most People Miss
If what appeals about Performance Max is the automation rather than the extra channels, AI Max for Search is worth a look.
It applies Google's AI to a Search campaign. Broader query matching, automatically created assets, URL expansion, text customisation, all inside a campaign type that still has keywords, still gives you a search terms report, and still only shows on Search.
For a cautious local advertiser, that's a far more sensible first step into automation than leaping straight to a campaign spanning six channels. It arrived in 2025 and the feature set is still evolving, so check what's actually available in your account before you build plans around it.
Don't Skip the Basics (Seriously)
Automation is only as good as what you feed it, and most garage accounts feed it badly.
Conversion tracking has to be right first. Website enquiries, calls from the ads, and calls from your website, all counted properly. For a garage, the phone call usually is the conversion. If those calls aren't tracked, the system is optimising towards the wrong thing, and it will get impressively good at achieving it.
The advanced version, and the thing that separates a good account from an average one, is offline conversion import. That means feeding back which enquiries actually turned into paying jobs, so Google learns the difference between a lead and a customer. A tyre price enquiry and a full clutch replacement aren't the same outcome. Until you tell it, Google can't tell them apart.
How to Actually Get This Right
- Start with Search. On £300 to £1,500 a month with a tight radius, control beats reach. You'll know exactly what you paid for.
- Turn the Display network off in your Search campaign. It's on by default in some setups and it dilutes high intent spend.
- Set location targeting to presence. People physically in your area, not people merely interested in it. Otherwise you're funding clicks from the other end of the country.
- Sort your conversion tracking before your bidding strategy. Calls included. This is the highest value hour you'll spend on the whole account.
- Build a proper negative keyword list. Jobs, training, salary, courses, parts, free, how to, DIY, plus the towns you don't cover. Then read your search terms report weekly for the first month and keep adding.
- Only test Performance Max once you're producing consistent monthly conversions. When you do, put the guardrails in before it goes live: brand exclusions, campaign level negatives, URL controls, tight radius. Then judge it on cost per genuine enquiry, not on total conversions, because total conversions include the people who were already looking for you.
- Find out what clicks actually cost in your town. National averages will mislead you. Open Google Keyword Planner, enter your real services and your real radius, and read the range for your own patch. That's the only number that matters.
Final Thought: It's Not Search vs AI Anymore
Performance Max isn't a scam, and Search isn't obsolete. They're tools with different appetites.
Performance Max is hungry. Give it a decent budget, plenty of conversion data and clear guardrails, and it will find you customers a keyword list would have missed. Give it a small budget and ten conversions a month, and it'll spend the money without ever really learning your business.
Search is the one that works on a modest budget, because it doesn't have to guess where your customers are. You already know. They're standing three miles from your ramp, typing "MOT near me" into a phone.
So the real question was never Search or Performance Max. It's how much automation you're ready for, and whether your tracking is good enough to trust it yet.
Start with control. Automate later, deliberately, when the data has earned it. This is how we run Google Ads for garages.
