A Google Ads account has three layers. The account holds campaigns, campaigns hold ad groups, and ad groups hold keywords and ads. Build campaigns around the settings you need to control separately, like budget and location. Build ad groups around a single theme, so the ads inside them can speak directly to the search.
That is the whole model. The reason structure is worth a full article is that campaigns are where budget, location and bidding live. Every time you decide something needs its own budget, you have decided it needs its own campaign.
There is also a cost to getting it wrong that most people do not know about. Google warns that reorganizing an account after you have built it “wipes out all the valuable data you’ve accumulated”. Restructuring is not free.
What are the three levels of a Google Ads account?
The account is the top level. It holds your billing details and your conversion actions, and it is the level at which Google looks at overall history.
Campaigns sit under the account. Each campaign has its own budget, its own bidding strategy, its own location targeting, its own ad schedule, and its own network settings. This is the control layer.
Ad groups sit under campaigns. Each ad group holds a set of keywords and the ads that should show for them. Google’s own advice is to group by a common theme, such as separating your different product or service types.
Google also publishes hard limits, which almost nobody reaches but which are useful to know: up to 10,000 campaigns per account including paused ones, 20,000 ad groups per campaign, and 50 text ads per ad group. Google’s own ABCs of Account Structure walks through the same three layers if you want it from the source.
How should you decide what gets its own campaign?
Split into a new campaign whenever you need a different budget, a different location, a different bidding target, or a different schedule. Do not split for any other reason.
Here are the splits that earn their keep in most accounts.
| Split | Why it matters | Worth doing when |
|---|---|---|
| Brand vs non brand | Brand clicks are cheap and convert well. Mixed in, they hide poor performance elsewhere. | Almost always |
| Service or product line | Different lines have different margins, so they need different targets | When margins differ by more than about 20% |
| Location | Budget and bids often need to differ by market | When one city or state is worth clearly more |
| High intent vs research | “Emergency plumber” and “how to fix a leak” deserve different money | When you want to protect bottom of funnel spend |
| Seasonal lines | Lets you raise and cut budget without disturbing the rest | When a product has a clear peak window |
What this means for you: if two groups of keywords would happily share the same budget and the same target cost per lead, they belong in the same campaign. Splitting them just spreads your conversion data thinner and slows down Smart Bidding.
How many keywords should be in an ad group?
Few enough that one ad can speak to all of them. In practice that usually means somewhere between three and twenty closely related keywords, not hundreds.
The old advice was to run single keyword ad groups, one keyword per group, so every ad matched perfectly. That made sense when exact match meant exact. It makes much less sense now that Google matches on meaning and intent rather than on the literal string.
The modern version of the same idea is to group by intent. All the ways someone asks for the same thing go in one ad group, even if the wording differs, because they all deserve the same ad and the same landing page.
A useful test: write the ad first. If you cannot write one headline that would honestly satisfy every keyword in the group, the group is too broad.
Does account structure still matter with Smart Bidding?
Yes, but for different reasons than it used to. It no longer matters for bid control, because Google sets bids per auction. It matters more than ever for budget control, measurement, and speed of learning.
Structure decides three things Smart Bidding cannot fix:
- Where your money can go. Budget is set at campaign level. Structure is the only tool you have for protecting spend.
- What you can see. If everything is in one campaign, your reports can only tell you one story.
- How fast Google learns. Conversions pool at campaign level. Twelve thin campaigns learn more slowly than three healthy ones.
That last point pushes in the opposite direction from splitting, and it is the real tension in modern account structure. Every split you make for control costs you a little learning speed. Make the splits you genuinely need and resist the rest.
What does a bad account structure look like?
The two failure modes are opposite, and we see both regularly.
The first is sprawl. Dozens of campaigns, most of them paused, many of them near duplicates, nobody able to say what any of them is for. Conversion data is spread so thin that no campaign ever gets enough volume for automated bidding to work. This usually happens when several people have managed the account over the years and none of them cleaned up.
The second is the single bucket. One campaign, one ad group, a thousand keywords, three ads. Everything competes for one budget, and you have no way to tell which half of the spend is working.
Both are fixable, but remember Google’s warning about losing accumulated data. Rebuild deliberately, not on a whim. This is exactly the kind of thing a proper Google Ads audit should surface before anyone starts moving things around.
Where do Performance Max and Shopping fit?
Performance Max does not use ad groups. It uses asset groups, and it takes most of the structural decisions out of your hands. You control the budget, the target, the assets and the audience signals, and Google handles the rest.
That makes structure around Performance Max more important, not less. Because you cannot steer inside it, the only lever you have is how many Performance Max campaigns you run and what feed or asset group sits inside each one. Our Performance Max guide covers what you can actually control there, and our Shopping guide covers structuring a product feed by priority and margin.
Common questions
Should I use single keyword ad groups?
Generally no, not anymore. Google matches on meaning rather than on exact strings, so a single keyword ad group often ends up serving a dozen different searches anyway. Group by intent instead.
How many campaigns should a small business have?
Most small accounts run well on two to five. A brand campaign, one or two campaigns for the main services, and sometimes a separate campaign for the best geographic market. More than that usually splits the data too thin.
Can I change the structure without losing performance?
You will lose some. Google is explicit that reorganizing wipes accumulated data. The safer approach is to build the new campaign alongside the old one, let it gather data, and then turn the old one off once the new one is performing.
Does structure affect Quality Score?
Indirectly. Quality Score is built from expected click through rate, ad relevance and landing page experience. Tight ad groups make ad relevance easier to achieve, because the ad can match the search closely. That is the main link between the two.
Should each ad group have its own landing page?
Ideally yes, or at least each campaign should. The match between the search, the ad, and the page is what drives both conversion rate and landing page experience. Sending every ad group to the home page is one of the most common and most expensive shortcuts.
How often should structure be reviewed?
Once or twice a year for most accounts, or whenever the business changes what it sells or where it sells it. Structure is not something to fiddle with monthly.
Where to go from here
The quickest way to test your own structure is to open the campaign view and ask, for each campaign, what decision it exists to let you make. If a campaign has no answer, it probably should not be a separate campaign.
If you would rather have someone walk the account with you, our Google Ads management page explains how we approach rebuilds, including how we avoid throwing away performance history. You can get in touch and we will tell you whether your account needs restructuring or just tidying. Often it is the second one.
