The auction changes even when your account does not. But before concluding the market moved, check whether something in the account actually did, because that is both more common and easier to fix.

1. Check the change history

Google Ads keeps a full log under Tools, then Change history. It shows every modification, what it was, and who made it.

Set the range to cover the fortnight before costs rose. Look for budget changes, bid strategy changes, new keywords, match type changes and edits to conversion settings.

Two things surface here more often than people expect. One is a change made by an agency or a colleague that nobody mentioned. The other is Google itself.

2. Check whether Google changed it for you

Auto-apply recommendations lets Google change your account automatically, and several types are enabled by default in many accounts.

Go to Recommendations, then Auto-apply, and look at what is switched on. Common ones that raise costs: broadening match types, adding keywords, raising budgets, and enabling Display expansion on Search campaigns.

Turn off anything you would not have approved yourself. Then check the change history again, because auto-applied changes appear there attributed to Google.

3. Check whether competitors arrived

Open the auction insights report on the affected campaign. It shows which other advertisers appear in your auctions and how their impression share has moved.

A new competitor with a large budget raises costs for everyone in that auction. So does an existing one becoming more aggressive.

There is no way to make them leave. The response is to compete where they are not: more specific long-tail keywords, tighter geography, better quality score so you pay less for the same position, and a stronger offer so a higher click cost still produces an economic lead.

4. Check quality score

Quality score directly affects what you pay per click for a given position. A decline raises costs without you touching a bid.

Add the quality score column to your keyword view and look for anything that has dropped. Common causes: a landing page that got slower, ad copy that has drifted away from the keyword, or a page that changed and no longer matches what the ad promises.

This one is worth chasing, because improving it lowers costs permanently rather than shifting them around.

5. Check for seasonality and match type drift

Cause	Signature
Seasonal demand	Costs and volume both up; repeats yearly
New competitor	Auction insights shows a new name
Quality score drop	Same position, higher cost per click
Auto-applied change	Appears in change history
Match type drift	Search terms report shows broader queries

Match type drift is worth explaining. Broad match keywords expand over time as Google's models reinterpret them, so a keyword that once matched narrow searches gradually pulls in wider, more expensive ones. The search terms report shows it plainly.

Compare this year against the same month last year rather than against last month, because that separates a seasonal pattern from a genuine change.

What not to do

Do not cut bids reflexively. Lower bids mean lower positions, which usually means fewer conversions at a similar cost per lead, so you shrink the account without improving it.

Diagnose first. In most cases the answer is in the change history or the auction insights report, and it takes ten minutes to find.

Juicy Designs monitors accounts for exactly these shifts and explains them monthly. See Google Ads management or a free account audit. Related: improving quality score and Google's recommendations.

Frequently asked questions

Why did my Google Ads costs go up without me changing anything?

Usually one of five things: more competitors entered your auctions, a seasonal demand spike, a quality score decline, a change Google applied automatically, or your match types drifting into more expensive searches. The auction changes even when your account does not.

Can Google change my account without me doing it?

Yes, if auto-apply recommendations are enabled, which they are by default for several recommendation types. Check under Recommendations, then Auto-apply, and review the change history for anything you did not authorise.

How do I see what changed?

Google Ads has a change history under Tools that shows every modification, who made it and when. Compare the date your costs rose against that log before assuming the market changed.

Does a lower quality score raise my costs?

Yes. Quality score affects what you pay per click for a given position, so a decline, often caused by a slower landing page or less relevant ad copy, raises costs without any bid change.

What should I do first?

Check the change history, then the auction insights report to see whether new competitors appeared, then your quality scores. Those three explain the large majority of unexplained cost increases.