Ad extensions, now called assets in Google Ads, are the extra pieces of information that appear with your ad: links to other pages, short benefit phrases, phone numbers, locations, prices and images. They do not replace a good headline, but they make your ad larger, more useful and more likely to be clicked. Best of all, most extensions cost nothing extra beyond the click itself, yet many small accounts never set them up at all.
Why extensions matter
On a phone screen, space is scarce. An ad with sitelinks, callouts and a location takes up more of that screen, pushes competitors further down, and gives the searcher more reasons to choose you. A searcher who wants pricing can click a pricing sitelink. One who wants to call can tap the phone number. One who is unsure about trust can read callouts such as Free quotes or Same-day service. Each extension answers a different question, without forcing the searcher to visit your site first.
Extensions also improve relevance. Google can show different extensions for different searches, and it can test which combinations perform best. That means a well-set-up ad is not one fixed message, but a flexible set of messages that adapts to the search. If you only write headlines and ignore extensions, you are giving Google less to work with, and giving competitors an easy advantage.
Sitelinks: give searchers a shortcut
Sitelinks are additional links below your main ad, each with a short title and optional description. Use them for the pages people most often need: Pricing, Book now, Services, Reviews, Contact, and a specific popular service. Link to the exact page, not the home page, and write descriptions that explain what the visitor will find there.
A dental clinic might use sitelinks for Emergency appointments, Teeth whitening, Check-up prices, and Patient reviews. A plumber might use Emergency call-out, Boiler servicing, Fixed prices, and Book online. Create sitelinks at account level for pages that apply everywhere, and at campaign level for pages that only apply to one service. Avoid duplicate sitelinks that all point to the same page, because they waste space and confuse the choice.
Callouts, structured snippets and call extensions
Callouts are short phrases, up to 25 characters each, that highlight benefits: Free quotes, No call-out fee, Open 7 days, Locally owned, 5-star rated. They do not link anywhere, but they add credibility in a few words. Use four to six callouts, keep them specific, and avoid repeating the headline. Free delivery is useful. Best service is not, because it cannot be verified.
Structured snippets show a header and a list of values, such as Services: Emergency plumbing, Boiler repair, Drain cleaning, or Types: Birthday cakes, Wedding cakes, Cupcakes. They help searchers understand your range quickly. Call extensions add a phone number and a call button, which is essential for businesses that convert by phone. Set call reporting so calls count as conversions, and use call scheduling so the number only appears when someone can answer.
Location, price, promotion and image extensions
Location extensions show your address and distance, and are especially valuable for local searches such as near me. Link your Google Business Profile correctly, and check that opening hours are accurate. Price extensions show a product or service with a price and a link, which helps pre-qualify clicks: people who click already know the cost, so they are less likely to bounce on price alone.
Promotion extensions highlight a time-limited offer, such as 10 percent off first booking until a date. Use them only for genuine offers, with a clear end date, and remove them when the offer ends. Image extensions add a photo next to your ad, which can lift click-through rate for visual products and services. Use bright, clear images that show the actual product or result, not a generic stock photo that could belong to any business.
A worked example: a local gym
Imagine a gym advertising for gym membership near me. Without extensions, the ad is a headline, a description and a link. With extensions, the same ad can show sitelinks for Membership prices, Class timetable, Free trial and Personal training, callouts for No joining fee, Open 24 hours and Free parking, a location with distance, and an image of the gym floor. The searcher can choose the exact next step that fits their question, and the gym does not pay extra for that larger ad, only for the click.
That gym should also check performance by extension. If the Free trial sitelink gets most clicks, make the trial more prominent on the landing page. If call extensions produce many calls but few memberships, check who answers the phone and what script they use. Extensions are not just decoration. Their click data tells you what searchers actually want, which is useful for your website and your ads.
Setup, policy and common mistakes
Set up extensions at the highest level that makes sense, then override them at campaign or ad group level where needed. Account-level extensions save time, but campaign-level extensions keep messages relevant. Check that every sitelink destination loads quickly on mobile, that phone numbers are correct, and that promotion dates are current. Broken sitelinks and outdated offers are worse than no extensions, because they send a motivated searcher to a dead end.
Common mistakes include using the same callout in every ad group, even when it does not apply, linking sitelinks to the home page, and adding extensions once and never reviewing them. Review extensions monthly, remove low performers, and test new ones based on questions customers actually ask. Also remember that Google decides which extensions to show, and when. Having more good extensions increases the chance of a strong combination, but it does not guarantee every extension will appear in every auction.
Extensions checklist
- Sitelinks to the most useful pages, with accurate destinations.
- Four to six specific callouts, not vague claims.
- Structured snippets that show your real range of services or products.
- Call extensions with reporting and scheduling, where calls matter.
- Location extensions linked to an accurate Business Profile.
- Price or promotion extensions only for genuine, current offers.
- Clear images that show the actual product or service.
- A monthly review of extension clicks, calls and landing page results.
Next, improve the main message with the ad copy guide, check Quality Score, and browse the guides index for your next improvement.
A quick setup routine
Set aside 30 minutes for a first extension setup. Start with four sitelinks, four callouts, one structured snippet, and a call extension if calls matter. Check the ad preview on mobile and desktop, click every sitelink to confirm the destination, and make sure the phone number is correct. Then add location or image extensions if they apply. That single routine often improves click-through rate within two weeks, without changing your bids or keywords. Revisit the setup after your first month, when you will have real click data to show which shortcuts searchers actually use and which ones they ignore.
Finally, remember that extensions work best when the rest of the campaign is also in order. If keywords are too broad, ads are generic, or the landing page does not match the promise, extensions will improve clicks but not necessarily sales. Fix the core first, then use extensions to give good ads more room to work. That order keeps your budget focused on visitors who are most likely to become customers, not just visitors who were curious enough to click a larger ad.