The site diversity system is a confirmed Google system that generally shows no more than two web listings from the same site in the top results, unless its systems judge more to be especially relevant. Subdomains are usually treated as part of the root domain. Google launched it in June 2019 and said it is about display, not ranking. For a site, this means several pages targeting the same query compete for two slots, so consolidating overlapping pages matters more than publishing more of them.
What is the site diversity system?
The site diversity system is a Google Search system that limits how many web listings from a single site appear in the top results. Google describes it in its ranking systems guide.
Google first announced it through its Search Liaison account on 6 June 2019, as reported by Search Engine Land the same day.
Our site diversity system works so that we generally won't show more than two web page listings from the same site in our top results, so that no single site tends to dominate all the top results.
Google, A guide to Google Search ranking systems, Google Search Central
How does the site diversity system treat subdomains and exceptions?
Two rules sit alongside the limit. Google may still show more than two listings when its systems decide that is especially relevant to a particular search. And subdomains are generally counted with the root domain, although they are sometimes treated as separate sites when Google deems it relevant.
Danny Sullivan also said at launch that it applies to the main web listings, not features such as featured snippets or map listings, as reported by Search Engine Roundtable.
Site diversity generally treats subdomains as part of a root domain.
Google, A guide to Google Search ranking systems, Google Search Central
What evidence is there that Google uses the site diversity system?
This is a Confirmed system. It is named and described in Google's ranking systems guide and was announced publicly at launch. Google's Danny Sullivan was clear that it changes what is displayed rather than how pages are ranked.
It's not really about ranking. Things that ranked highly before still should. We just don't show as many other pages.
Danny Sullivan, Google, reported by Barry Schwartz, Google search update aims to show more diverse results from different domain names, Search Engine Land
What does the site diversity system mean for sites?
If Google will usually show at most two of your pages for a query, then a third, fourth or fifth page aimed at the same query adds little and can split signals. That turns keyword cannibalisation from a tidiness issue into a hard ceiling.
Moving content to a subdomain is not a reliable way around the limit, because Google generally treats subdomains as the same site. The falsifiable test is in Search Console: for your top queries, count how many distinct URLs from your site receive impressions. Where three or more URLs share a query and rotate, the site is competing with itself for two slots.
- Merge or differentiate pages that target the same intent.
- Choose one primary URL per intent and point internal links and canonicals at it.
- Do not spin up subdomains to occupy more results; it usually will not work and can look manipulative.
Which Laurelin audit checks test for site diversity issues?
The new check, Three or more URLs compete for the same query, uses Search Console data to find queries where several of your URLs share impressions. It measures a symptom (URL rotation and split impressions) that the documented two-listing limit makes costly; it cannot see Google's diversity decisions directly.
Related checks:
- Internal duplicate content: duplicate pages are the most common cause of same-query competition.
- Duplicate titles across pages: a quick signal that pages target the same query.
- Doorway pages: many near-identical pages aimed at one query set.
- Page-per-query variant farm: the scaled version of the same pattern.
- Non-canonical URL indexed: unconsolidated duplicates that can take one of the two slots.
What are the key dates for Google site diversity system?
Frequently asked questions about Google site diversity system
How many results from one site does Google show?
Google says it generally won't show more than two web listings from the same site in its top results, but may show more when especially relevant to a search.
Do subdomains count as separate sites?
Generally no. Google says site diversity treats subdomains as part of the root domain, though sometimes they are treated separately when deemed relevant.
Is site diversity a ranking factor?
Google said at launch that it is not really about ranking; it limits how many pages from one site are shown.