Should you create related content to boost your topical authority?

Does Google really measure a “topical authority”?

Yes, and it’s not new. The algorithm has long assessed the semantic consistency of a site through the analysis of its content corpus. What Mueller refers to as “topical authority” likely relates to several combined signals: the lexical coverage of a topic, the frequency of publication on related themes, and the internal links that weave this network of meaning.

The notion of topical authority is not officially documented in Google’s public guidelines, but all field tests converge: a site that covers a topic in depth and its peripheral angles performs better on broad queries. Mueller confirms this without revealing the exact metrics used.

What exactly do we mean by “related topics”?

This is where things get tricky. The statement remains vague about the acceptable scope. For a laptop seller, product reviews are obviously related. But what about an article on “how to optimize Windows 11” or “the best desks for remote work”? The boundary between related and off-topic depends on Google’s interpretation.

In practice, we observe that Google favors content that shares named entities and lexical co-occurrences with the core business. If your site frequently mentions brands, components, and uses related to laptops, an article about remote work desks may dilute your topical signal rather than reinforce it.

How does this authority translate into visibility?

Mueller indicates that this strategy allows Google to “show the site for broad queries.” In other words, a site recognized as a topical expert has a better chance of ranking for highly competitive generic terms. This aligns with what we observe: specialized sites dominating a sector often capture positions on broad informational queries, even without massive backlinks.

But beware: this mechanism does not replace traditional relevance signals. Good internal linking, content optimized for user intent, and a clear architecture remain essential. Topical authority acts as an amplifier, not a substitute.

• Semantic coherence: Google analyzes lexical density and recurring entities on your site
• Vague scope: The boundary between “related” and “off-topic” is not officially documented
• Impact on broad queries: A recognized topical authority facilitates positioning on generic terms
• Complementarity of signals: Topical authority does not excuse fundamental SEO practices

Does this statement align with real-world observations?

Absolutely. All audits I’ve conducted over the past decade show that sites with a dense topical coverage outperform their competitors with equivalent backlinks. Pure specialized players often crush generalists better endowed with incoming links — that’s exactly what Mueller describes here.

However, [To verify]: Mueller speaks of “trust” and “reputation,” but Google has never explained a dedicated metric. We can assume it involves a composite score integrating E-E-A-T, but there is no formal proof. It would be helpful for Google to clarify whether this “reputation” is a distinct signal or a result of other factors.

What nuances should be added to this advice?

The main limit is the risk of thematic dilution. If you broaden your scope of related content too much, you risk blurring your main signal. I’ve seen e-commerce sites lose positions after launching a catch-all blog meant to “cover the theme.”

Another critical point: Mueller does not mention the quality of related content. Publishing twenty mediocre laptop reviews will not build any reputation — on the contrary, it may trigger quality filters. Depth and originality matter as much as coverage.

In what cases does this strategy fail?

The first failure case is sites confusing volume and relevance. Creating fifty related articles on low commercial intent queries won’t enhance your reputation if your goal is to sell. Google will prefer competitors whose related content aligns with the dominant user intent in the niche.

The second pitfall: neglecting architecture. Even with excellent related content, if your internal linking doesn’t clearly connect these pages to strategic pages, the reputation effect will be limited. Internal PageRank must circulate coherently for Google to understand your thematic topology.

How to define the scope of your related content?

Start by mapping your main entities: brands, products, components, uses. Use an NLP tool to extract lexical co-occurrences from your strategic pages. Any related content should share at least 40% of these entities to be considered relevant.

Next, analyze the SERPs of your dominant competitors. What types of related content are they publishing? What is their average depth? Don’t blindly copy, but identify recurring patterns: buying guides, comparisons, tutorials, glossaries. These formats have proven effective for building authority.

What volume of related content should you aim for?

There’s no magic ratio, but an empirical rule: for each strategic page (product sheet, service), aim for at least three quality related contents. Quality means: minimum 1,200 words, original research or field expertise, internal links to strategic pages.

Avoid publishing too quickly. It’s better to have ten excellent related contents published over three months than fifty mediocre articles in one month. Google values consistency and depth over raw frequency. A good rhythm: one related content per week, with a quality audit before publication.

How to measure the impact of this strategy?

Monitor the evolution of your positions on broad high-volume queries — those where you aren’t ranking yet due to lack of authority. If your strategy is working, you should gain positions between the top 20 and top 10 within three to six months following the regular publication of related contents.

Another key metric: the click-through rate on your strategic pages from your related contents. If these generate traffic but zero conversions to your target pages, it means your internal linking is failing or your related contents are attracting the wrong audience. Adjust accordingly.

• Map your main entities and lexical co-occurrences
• Analyze the related contents of your three main competitors
• Define a minimum ratio of 3 related contents per strategic page
• Publish at a regular pace (1 content/week) rather than in bulk
• Track positions on broad queries and internal traffic to target pages
• Audit quality quarterly and prune underperforming contents