Topical authority isn’t a score Google publishes. It’s a way of describing something SEOs see again and again: a site that covers one subject in depth tends to rank more easily for new content on that subject than a site that touches it once. Google’s own documentation talks about rewarding sites that show expertise on a topic, and its systems are designed to recognize sources that are knowledgeable about a subject.
Why it matters
Imagine two coffee sites. One publishes a single post on cold brew. Bean & Barrel Coffee publishes a set of connected pages: a cold brew guide, the best beans for cold brew, cold brew ratios, cold brew concentrate versus ready-to-drink, how long cold brew keeps, a recipe for cold brew with milk, and product pages for its cold brew blend. Each links to the others. When Bean & Barrel publishes the next cold brew article, it has a head start because the site has already shown it knows the subject.
For a local business, the same principle applies on a smaller scale. Coastline Plumbing covering water heaters thoroughly (repair, replacement, tankless, maintenance, common noises, costs, brands it services) is more convincing than one generic “water heaters” page.
How to build it
- Pick a focused topic close to what you sell. Depth in a few areas beats thin coverage of many.
- Map the subtopics people search for: questions, comparisons, problems, costs.
- Organize them into a topic cluster around a central pillar page.
- Link the pages together with descriptive internal links.
- Show real expertise: first-hand experience, specific details, original photos, named authors.
- Fill gaps and keep content current rather than jumping to a new topic too soon.
Common mistakes
- Writing about everything. A plumber’s blog with posts on cryptocurrency and travel tips dilutes the signal.
- Volume over quality. Fifty thin AI-written posts on a topic don’t create authority; they can do the opposite.
- Unlinked content. Related articles that never link to each other don’t form a cluster.
- Ignoring trust. Topical authority overlaps with E-E-A-T: who wrote it and why should readers believe them?
How to plan it
RankThat’s Content tools include topical authority planning, content gap analysis and topic ideas, so you can see which subtopics you’ve covered, which competitors cover that you don’t, and what to write next.