What Is a Sitelink Extension?
A sitelink extension is an ad asset you add to a Google Ads campaign that appends two to six extra links below your main ad headline. Each sitelink includes a short headline and an optional two-line description, and each link points to a different page on your website. When Google determines that sitelinks are relevant to a search, it selects and displays them automatically beneath the standard ad text.
Sitelinks were originally known as "ad extensions" but Google rebranded them as "ad assets" in 2023. The functional behaviour remains the same: the system evaluates the user's search intent, your ad's relevance, and your account's overall quality to decide whether to show sitelinks and which combination to display. This means you cannot control exactly which sitelinks appear on any given impression, only which ones are eligible.
The most important thing to understand about sitelink extensions is that they increase the physical size of your ad on the search results page. A larger ad captures more visual attention and occupies more screen space, which reduces the visibility of competing ads. This size advantage alone is a compelling reason to add sitelinks even before considering the navigation benefit they provide to users who already know what they are looking for.
From a cost perspective, sitelinks operate on the same cost-per-click model as your main ad. Clicks on sitelinks are charged at the same bid rate, so each sitelink click represents an additional spend item. Well-configured sitelinks tend to direct users to high-converting pages, which makes the incremental spend worthwhile for most South African businesses running search campaigns in competitive verticals like insurance, property, legal services, and automotive.
Sitelink Extension In Practice
Consider a Johannesburg-based solar installation company running Google Ads for the keyword "solar panels Johannesburg". Without sitelinks, the ad shows a headline and two lines of description. With four sitelinks configured, the ad could additionally show links to "Get a Free Quote", "Solar Panel Pricing", "How Installation Works", and "Customer Reviews". A user who is comparison shopping immediately clicks the pricing sitelink rather than the main headline, landing on the exact page that answers their question. This relevance improvement reduces bounce rate and increases the probability of a conversion.
For South African businesses with multiple service lines, sitelinks are particularly effective at directing different audience segments to the right starting point. A Cape Town accounting firm might use sitelinks for "Tax Returns", "Business Accounting", "Payroll Services", and "Contact Our Team". Each sitelink addresses a different user intent within the same broad campaign, improving the experience for all searcher types without requiring separate ad groups for every permutation.
How sitelink extensions work
Sitelink extensions (now often called sitelink assets) are additional links shown beneath a Google search ad that take users to specific pages of your site beyond the main landing page, such as particular products, services, categories or a contact page. Rather than an ad offering a single link, sitelinks let it present several relevant destinations, so a searcher can go straight to the part of the site most relevant to them. You provide the sitelinks, each with link text and a destination, and Google shows a selection when it judges they will help and when the ad's position and format allow, so they do not always appear or all show at once. Sitelinks make an ad larger and more useful, occupying more of the results page and giving searchers more ways to engage, which is why they are a standard, recommended addition to search campaigns: they enhance an ad at no direct extra cost while improving its relevance and prominence.
The benefits of sitelink extensions
Sitelink extensions benefit search ads in several ways. They make an ad more prominent and take up more space on the results page, which can improve visibility and click-through, and they can improve the ad's usefulness and relevance by offering searchers direct routes to what they want, sending people to the most relevant page rather than a generic landing page, which supports conversion. Because they add information and links without extra cost per impression, and you are only charged normally when someone clicks, sitelinks enhance an ad efficiently. They also contribute to the overall quality and expected impact of the ad's format, which factors into ad rank, so a well-extended ad can compete more effectively. The practical guidance is to add several relevant, distinct sitelinks pointing to genuinely useful pages, so Google has options to show the most fitting ones. Because they improve prominence, relevance and usefulness at no direct extra cost, sitelink extensions are considered a basic best practice for search campaigns rather than an optional extra.
FAQ
How many sitelink extensions should I add to a Google Ads campaign?
Google recommends adding at least four sitelink extensions per campaign. The system selects the most relevant ones to display based on the search query and device. Having six to eight sitelinks gives the algorithm enough variety to optimise for different user intents and increases the chance of showing a larger ad format.
Do sitelink extensions cost extra in Google Ads?
Sitelink extensions do not have an additional setup cost. You pay the same cost-per-click whether a user clicks the main headline or a sitelink. Each click on a different sitelink counts as a separate click, so budgeting should account for the potential increase in overall click volume when sitelinks are active.
Do sitelink extensions cost extra?
No, there is no extra charge for adding sitelink extensions or for them appearing. You are charged as normal only when someone clicks, at your usual cost per click, whether they click the main ad or a sitelink. This makes sitelinks a way to enhance an ad's prominence and usefulness at no direct additional cost.
How many sitelink extensions should you add?
Add several relevant, distinct sitelinks, more than the few that may show at once, so Google has options to display the most fitting ones for each search. Providing a good range of genuinely useful destinations lets the system choose the best combination, while too few limits its ability to enhance the ad.