Topical authority explained: the map, not the pile
"Topical authority" is one of the most repeated phrases in SEO, and one of the most stretched. At its best it means covering a subject so well that your site is the obvious place to send someone asking about it. At its worst it's an excuse to publish hundreds of near-identical pages.
By the Boltly team · Melbourne
Updated
Subject mapHot water systems, as an example
- Hot water systems
- Installation and repairs
- Replacement cost
- Rebates
- Heat pump or gas
- Tank size
- No hot water
- Leaking tank
Reading the map
- Yellow stop the main service page, where every line meets
- Each line one decision a customer is trying to make
- Each stop one question that earns its own page
Not on the map: pages for wording variations ("price", "cost", "how much") and suburb copies of the same page.
An illustration of how a plumber might map one subject.
What topical authority means
Topical authority is the SEO industry's name for the trust a site earns on a subject by covering it thoroughly, accurately and from real experience, so that its pages are a strong choice for many related searches. It isn't a score you can look up, and Google hasn't published a general "topical authority" ranking factor for ordinary websites.
The phrase gets used to sell volume: "you need topical authority, so you need 200 articles". That's how plenty of sites end up with dozens of thin pages that repeat each other, and nothing Google has published supports it. Its guidance points to focus, depth, first-hand knowledge and one good page per real question.
The useful version: pick the subjects your customers ask about, answer each real question once and well, link the answers, and keep them accurate.
What Google has actually said
Four pieces of Google documentation support the sensible version of topical authority and rule out the spammy one.
23 May 2023
A "topic authority" system exists, for news
Google's Search Central blog described a topic authority system that helps find expert sources for newsy searches in specialised areas such as health, politics or finance. It looks at how notable a publication is for a topic or place, how often its original reporting is cited, and its reputation.
Google Search Central blog, "Understanding news topic authority"
Updated 10 Dec 2025
Site-wide signals are real
Google's guide to its ranking systems says it mainly ranks individual pages, but site-wide signals and classifiers also contribute. It adds that good site-wide signals don't mean every page will rank well.
Google Search Central, "A guide to Google Search ranking systems"
Updated 1 Oct 2026
Focus helps; scattering hurts
Google's helpful content guidance asks whether your site has a primary purpose or focus, and lists producing lots of content on many different topics, hoping some performs, as a warning sign.
Google Search Central, "Creating helpful, reliable, people-first content"
Current guidance
Links show how pages relate
Google says it uses links as a signal of relevance and to find new pages, and asks for descriptive anchor text.
Google Search Central, "Link best practices for Google"
Google doesn't say how many pages a subject needs, publishes no topical score, and says in its helpful content guidance that it has no preferred word count.
All four read 4 October 2026.
How to map a subject, one real question at a time
A subject map lists the questions your customers ask, groups them, and decides which deserve a page of their own. The last step is where most sites go wrong.
Collect real questions
Use questions from phone calls and emails, your Search Console searches, Google's autocomplete and "People also ask" boxes. Write them down in the customer's words.
Group them by need
"How much is a new hot water system" and "hot water replacement price" are the same need. "Is a heat pump worth it" is a different one. Group by what the person is trying to decide, not by the wording.
Give each need one page
A need that a reader would search for on its own, with enough to say, earns a page. A need that's really part of a bigger decision becomes a section of that page. Variations of wording never get separate pages.
Choose the main page for the subject
Often called a pillar page: the broad page that introduces the subject and links out to each supporting page. For many small businesses, this is simply the service page.
Link them like a map
Every supporting page links back to the main page and across to its closest neighbours, with anchor text that says what's on the other end. A reader should never hit a dead end.
Keep it true
Prices, rebates and rules change. Review the pages that carry facts at least once a year; a map is only as trustworthy as its least accurate page.
Our keyword research guide covers finding the questions, the semantic SEO guide how Google reads related ideas, and the content strategy article how a map becomes a publishing plan.
Page or section? Sorting a plumber's questions
Here's how we'd sort ten hot water questions for a local plumber. The questions are typical; the decisions are ours.
Six of the ten earn their own page, because each is a separate decision someone might search for on its own day. Three become sections of a bigger page, because nobody needs them without the surrounding context. The tenth, a page per suburb, gets nothing: the same answer with a different place name is what Google's doorway policy describes.
Price sits on the cost page because it's the same need in other words. Installation time and a dripping relief valve get headings inside the installation and repairs page, where readers meet them.
The result is six well-built pages around one service page, linked together: a realistic job for a small business.
Sorting tableIllustration
- Hot water replacement costOwn page
- Heat pump or gas?Own page
- Hot water rebatesOwn page
- No hot water: what to checkOwn page
- Leaking hot water tankOwn page
- What size tank do I need?Own page
- Hot water system priceSame as cost
- How long installation takesSection
- Relief valve drippingSection
- Hot water plumber in each suburbNo page
A year of weekly blog posts and the traffic line hasn't moved
A posting schedule isn't a subject map. Fifty posts on general topics ("why maintenance matters", "five tips for winter") mostly compete with larger sites that answered the same thing years earlier, and none of them is the page a customer needs on the day they're ready to buy.
If that's you, pause the schedule for a month and audit what you have; for fifty posts it takes about half a day.
- Sort posts by clicks. In Search Console's Performance report, open the Pages tab for the last twelve months. Most small-business blogs find a handful of posts doing all the work.
- Check what each earner ranks for. Open a post's queries. If the queries are close to what you sell, that post is a stop on your map; link it to the service page and keep it accurate.
- Group the rest by need. Posts with no clicks that cover the same need get merged into one fuller page and redirected. Posts on topics nobody who buys from you would search get retired.
- Rewrite from the job, not the topic. The posts that earn their place carry things a bigger site can't copy: what you charged on a recent job, the fault you see most each winter, the photo of the part that failed.
One page a month that answers a real customer question in full will do more than four that restate what's already on page one. Google's own guide to its AI features makes the same split: it calls tips-list articles built on common knowledge "commodity content" and asks for first-hand, expert takes instead.
Source: Google Search Central guide to generative AI features in Google Search, last updated 10 July 2026, read 5 October 2026.
When "coverage" turns into scaled content
Pushed too far, map-building turns into what Google's spam policies target. Four patterns to avoid:
A page per wording
Separate pages for "cost", "price" and "how much" of the same thing. Google's generative AI guide says making content for every variation people might search, mainly to manipulate rankings, breaches its scaled content abuse policy.
A page per suburb with nothing new
The same service page with a different suburb name. Google's doorway policy names pages targeted at specific regions that funnel to one place.
Mass-produced articles
Dozens of AI-written posts published to "fill the map". Google's spam policy covers many pages made mainly to manipulate rankings, however they're made.
Topics far from the business
A plumber publishing travel tips because a tool said they'd get traffic. Google's helpful content guidance flags writing on many different topics in the hope something works.
Google's spam updates in March, June, August and September 2026 enforce these policies. The fix for a site that has drifted into any of them is usually fewer, better pages: merge the near-duplicates, redirect them to the strongest version, and rewrite what's left from real experience.
Sources: Google Search Central, "Spam policies for Google web search" (last updated 28 August 2026) and the generative AI features guide (last updated 10 July 2026), read 4 October 2026.
How to tell if a subject map is paying off
There's no topical authority figure to watch, but Search Console shows the effect clearly enough.
- More queries per page. In the Performance report, filter to one page and count the queries it appears for. A useful page starts showing for related searches you never wrote it for.
- Supporting pages lifting the main page. Watch the service page's impressions as its supporting pages go live and get linked. They should rise together.
- Fewer pages competing with each other. If two of your pages swap places for the same search month to month, they're probably answering the same need. To check, click the search in the Performance report's Queries tab, then switch to Pages: more than one of your URLs there is the warning. Keep the stronger page, fold in anything useful from the weaker one, and 301 redirect the weaker URL.
- Enquiries that mention the content. Ask new customers how they found you. "I read your page on heat pumps" is the best measure there is.
Give it time. Google's SEO starter guide says changes can show within hours or take several months. A focused map usually shows first in the queries report, then in enquiries.
Our content and on-page SEO service maps the subject with you, writes the pages from your knowledge and links them. Our article on how long SEO takes covers timing.
Topical authority, answered
What is topical authority in SEO?
It's the SEO industry's term for the trust a site earns on a subject by covering it thoroughly and accurately from real experience. It describes the result of focused, helpful content and good internal linking. It isn't a published Google metric.
Is topical authority a Google ranking factor?
Not as a named factor for ordinary sites. Google has described a "topic authority" system for news searches (May 2023), and its ranking guide says site-wide signals contribute alongside page-level ones.
What is a topical authority map?
A topical map, or topical authority map, is a plan of the questions people ask about a subject, grouped by need, showing which deserve their own page, which become sections, and how the pages link.
What are pillar pages and topic clusters?
A pillar page is a broad page introducing a subject; a topic cluster is the set of supporting pages that each answer one part of it in depth, all linked to the pillar and to each other.
Is there a topical authority checker?
Several SEO tools offer one, but each uses its own formula. Google doesn't publish a topical score. Search Console, filtered by page, shows the more useful signal: how many related searches each page appears for.
How many articles do I need for topical authority?
There's no number. Google says it has no preferred word count, and nothing it publishes sets a page count. Write one page for each distinct question your customers have, and stop when the remaining ideas are wording variations or belong as sections.
Can a small business build topical authority?
Yes, often more easily than a big one: a narrow subject tied to what you do is easier to cover completely. A plumber who answers every real question about hot water systems in their area has a focus a national directory can't match.
Google's autocomplete suggested "topical authority in seo", "what is a topical authority map", "topical authority checker", "pillar pages and topic clusters" and "topic cluster in seo" when we searched from Australia on 4 October 2026.
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