Related niche topics and subcategories: one website or separate domains?

If related topics serve overlapping audiences and clear categories can help readers navigate, consider keeping them on one website first. Consider separate domains only if the audiences have distinct needs and separate sites would genuinely be easier to use and maintain. This is conditional advice from public discussions, not an official search engine rule. Nor is there evidence supporting claims that categorization immediately improves rankings or that separate sites are necessarily better. The decision should focus on how the topics relate, readers’ needs, and the maintenance burden—not just whether a domain name can include keywords.

Related topics and readers who browse across categories make a stronger case for one site

News about different sports can sit within a single sports website, organized into subdirectories for football, cricket, tennis, and so on. In public discussions, the reasoning behind this arrangement is that readers who follow multiple sports are less likely to be confused if everything stays on one site. Each category can still have an appropriate URL and page title, without needing a separate domain.

A response to an IT training case also favored keeping content together, but with important conditions: the main site already had substantial content, and the training topics were closely related. The respondent argued that creating topic sections within a single domain would better consolidate internal and external links and organize the content. This was a judgment about that particular situation, not evidence that every website would gain a ranking advantage from doing so.

Readers interested in only one category provide a reason to consider separate sites, not a fixed threshold

Another response offered a contrasting condition: if typical readers care about only one sport, consider separate domains linked to one another; if they regularly follow several sports, use a single domain. The difference between these recommendations lies in their assumptions about how readers use the sites, not in one structure being universally correct.

• If “95% of users read only one category” is merely a planning assumption, it must not be treated as observed behavior, much less an official criterion for splitting a site.
• Using the same layout but different content styles is not enough on its own to determine the number of domains. Compare which arrangement makes it easier for readers to find and use the content.
• Even if each site has a clear focus, maintenance costs still need to be weighed. The discussion notes that multiple sites usually create extra work, and difficulty maintaining them over time may harm the user experience.

For a coffee website, clarify how the categories relate rather than deciding by article count

Having 40 articles each about coffee machines, coffee grinders, coffee tables, and coffee spoons is not, by itself, enough to decide whether to create separate sites. Applying the conditions above, first ask: Do these categories serve the same audience? Do readers need to find related information across categories? Can the categories be clearly distinguished within one website? Shared use of the word “coffee” does not establish that readers’ needs are the same.

If the answers point to shared use cases, start by planning categories and subcategories within one site. If the needs are distinct, then compare whether separate websites would be more convenient. Categories can organize content, but the available material provides no article-count threshold for splitting a site and does not establish that keyword domains offer a ranking advantage over categories within one site.