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Google Ads does not charge any additional fee to add extensions to your ads.
Your actual Cost Per Click for ads with extensions is calculated the same way as for ads without extensions. I.e. you bid against other businesses seeking to place ads on the same keywords, and you pay the cost of the click, no matter what part of your ad they click on.
It may occasionally cost you more if you use extensions. If your ad has multiple things that can be clicked as a result of adding extensions, a user may click the same ad more than once. In this case Google Ads charges for two clicks rather than one.
The maximum charge is two clicks per impression for each ad and its extensions no matter how many times someone clicks on the ad.
Something else to consider is that the conversion rate may increase or decrease based on which page a user lands on. If you use Automated Extensions and the user clicks a link and is directed to a broken or non-sales page, then the conversion rate may decrease as a result of using the extensions. For this reason we recommend turning off Automated Extensions and using Manual Extensions instead.
If your ad is larger it tends to take up more real estate on the Google search results. So an ad loaded with extensions should theoretically get a higher Click-through rate than one without them. Given there is no additional charge, it makes sense to use as many extensions as it makes sense to, as long as they are effective.
This tip and many others are found at https://www.petramanos.com/category/tips/