Topical authority is the depth and reliability a site shows on a subject when it covers that subject thoroughly, accurately and from real experience. Content clusters are the practical way to build it: one hub page on a broad topic, connected by internal links to supporting pages that each answer a specific question in full.
“Topical authority” is not a score Google publishes, and no tool can measure it directly. It is a useful name for something real: sites that cover a subject well, with connected pages written by people who know the work, tend to be easier for search engines and AI assistants to trust on that subject. This guide explains how to plan a content cluster, how many pages a cluster really needs, how to avoid producing thin or repetitive content, and how to measure whether the cluster is working. It is written for teams who want to publish less, but better.
Key takeaways
- Depth beats breadth. Ten connected, excellent pages on one topic usually do more than fifty scattered posts across many topics.
- Every page needs a distinct job. If two pages answer the same question, merge them.
- Experience is the differentiator. Google’s people-first content guidance asks whether content shows first-hand expertise. Generic summaries rarely do.
- Scale is not a strategy. Google’s spam policies treat mass-produced pages made mainly to manipulate rankings as scaled content abuse, however they are produced.
- Links make it a cluster. Without hub-to-spoke and spoke-to-spoke links, it is just a list of articles.
What is topical authority, really?
Search engines try to show the most helpful, reliable result for a query. For many queries, the best result comes from a source that clearly understands the whole subject, not just one keyword. A site that explains technical SEO, Core Web Vitals, migrations, structured data and audits, with each page linking to the others and written from hands-on work, gives a much stronger impression of expertise than a site with one generic “What is SEO?” post.
Google’s guidance on creating helpful, reliable, people-first content sets out the questions to ask of every page: does it provide original information or analysis, does it offer a substantial and complete description of the topic, does it demonstrate first-hand expertise, and would a reader leave feeling they learned enough to achieve their goal? A content cluster is a way of answering yes to those questions across an entire subject.
Why does this matter for AI search?
AI assistants and Google’s AI features summarise information and cite sources. Google’s documentation on AI features confirms there is no separate optimisation for AI Overviews or AI Mode; the foundations of helpful content and technical SEO apply. In practice, a site that covers a topic in connected depth gives these systems more relevant, quotable passages to draw on. Our guides on answer engine optimization and generative engine optimization cover the answer-level detail.
What does a content cluster look like?
A cluster has three parts:
- A hub (sometimes called a pillar page): a broad, well-organised page that introduces the topic, defines the key ideas and links to every supporting page. It may be a guide or a service page.
- Supporting pages (spokes): each answers one specific question or covers one subtopic in full.
- Links: the hub links to every spoke, every spoke links back to the hub, and spokes link to each other where the topics genuinely overlap.
One hub, connected spokes
This is the cluster this guide belongs to. Each spoke links back to the hub and to two or more siblings.
In our own library, the SEO strategy guide acts as the hub. Supporting guides include keyword research and search intent, site architecture and internal linking, technical SEO, Core Web Vitals, entity SEO and structured data, the SEO audit checklist, website migration SEO and link building and digital PR.
The Bargaon cluster plan: six steps
This is the process we use to plan a cluster from scratch. It keeps the focus on buyer questions and on pages that deserve to exist.
1. Choose a topic you can genuinely own
Pick a subject tied to what you sell and where you have real experience. Ask: could our team answer a buyer’s hardest question on this topic from memory? If not, the cluster will struggle to offer anything beyond what already ranks.
2. List every question a buyer asks
Use sales calls, support tickets, Search Console, People Also Ask and keyword tools. Write each as a full question. The process is covered in detail in our keyword research guide.
3. Group questions into pages
Group questions that one page could answer completely. Each group becomes a spoke. Questions that are too small for their own page become sections or FAQs within a spoke.
4. Decide what the hub must do
The hub should give a complete overview, define terms, explain how the subtopics connect and link to every spoke with a short summary of what each one covers. It should be useful on its own, not just a table of contents.
5. Plan the links before writing
Draw the cluster. Mark which spokes link to which. Agree the anchor text. Add a link from each spoke to the relevant service page, because a reader who has learned enough may be ready to talk.
6. Publish in a sensible order
Start with the hub and the spokes that answer the most commercial questions. Add the rest steadily. Update the hub every time a new spoke goes live.
How many pages does a cluster need?
As many as the topic genuinely requires, and no more. For a focused B2B service topic, that is often six to twelve supporting pages. Broader topics may need more, split into sub-clusters. The table below shows how to decide.
| Question type | Treatment | Example |
|---|---|---|
| Needs a step-by-step answer of 1,500+ words | Own spoke page | How to plan a website migration |
| Has its own search demand and distinct intent | Own spoke page | Core Web Vitals thresholds and fixes |
| Can be answered in a paragraph or two | Section or FAQ in a related spoke | What is a canonical tag? |
| Same intent as an existing page | Merge into that page | “Keyword research process” vs “how to do keyword research” |
| Commercial (“hire”, “cost”, “agency”) | Service page, not a guide | Technical SEO consultant |
| Outside your expertise | Do not publish; link out to a trusted source if needed | Legal advice on data protection fines |
What makes a supporting page strong?
A spoke wins when it is clearly the best answer to its question. We check every guide against these standards before publishing:
- A direct answer first. A 40 to 60 word answer in the opening paragraph, then the detail.
- Question-style headings that match how buyers ask.
- Evidence with dates. Statistics from named, recent sources, with the year in the sentence.
- A table, checklist or diagram that makes the information easier to use.
- An original framework or worked example from real practice, clearly labelled when illustrative.
- Honest limits: what the approach cannot do and when to get help.
- Connected links to the hub, siblings and the relevant service.
Same effort, different results
Two hypothetical plans with the same budget of 20 pieces over six months. Fictional figures for illustration only.
How do you scale content without crossing into spam?
Google’s spam policies define scaled content abuse as generating many pages primarily to manipulate search rankings rather than to help users, and they make clear this applies however the content is created, whether by automation, people or a combination. The same document describes site reputation abuse and expired domain abuse, which also target shortcuts to authority.
That does not mean you cannot use AI or templates. It means every page must earn its place. Practical safeguards:
- Every page answers a real question with information a reader cannot easily get elsewhere.
- A person with relevant experience reviews and edits every page before publishing.
- Location or industry variants are only created when the content genuinely differs, not by swapping a city name.
- Pages that get no impressions after six months are reviewed: improved, merged or removed.
Worked example: planning a CRM cluster
Imagine a fictional consultancy that sets up CRM systems for small B2B teams. Its sales team keeps hearing the same questions: which CRM should we choose, how do we move from spreadsheets, how should leads be passed to sales, what should we automate first, and how do we know whether it is working?
The cluster plan looks like this:
- Hub: the CRM service page, which explains the offer and links to every guide below.
- Spoke 1: choosing a CRM for a small B2B team, an honest comparison with decision criteria.
- Spoke 2: migrating from spreadsheets to a CRM, a step-by-step guide with a data-cleaning checklist.
- Spoke 3: lead management and sales handoffs, covering stages, ownership and response times.
- Spoke 4: what to automate first, with a priority table.
- Spoke 5: CRM reporting that leadership will actually use.
- FAQs inside spokes: “How long does CRM setup take?”, “Do we need a paid plan?”, “Who should own the CRM?”
Each spoke links to the hub, to the two most related spokes and to a free tool where one exists. The hub summarises each spoke in two sentences. Five pages, all clearly needed, all connected. Twenty thin posts on “CRM tips” would cost more and do less. This example is illustrative and does not describe a real client.
What are the most common cluster mistakes?
- Hubs that are only link lists. A hub must be useful on its own. If it adds nothing but links, readers bounce and search engines see little value.
- Spokes that overlap. Two pages answering the same question compete with each other. Merge them and redirect the weaker URL.
- Forgetting the commercial link. Educational pages that never mention the related service leave readers with nowhere to go once they are ready.
- Publishing everything at once, then stopping. Clusters need updates. A cluster that was excellent two years ago and never touched since will slowly lose ground.
- Chasing topics outside your expertise. Adjacent topics with high search volume can attract the wrong audience and weaken the impression of focus.
- Treating word count as quality. A padded 3,000-word page is worse than a sharp 1,500-word page that fully answers the question.
How do you measure whether a cluster is working?
Measure the cluster as a group, not page by page. In Search Console, filter by the /guides/ folder or by a list of cluster URLs and track:
| Metric | Where | What it tells you |
|---|---|---|
| Impressions for cluster queries | Search Console, Performance | Whether Google shows the cluster for the topic |
| Number of distinct queries | Search Console, Performance | How broadly the cluster is understood |
| AI Overviews and AI Mode impressions | Search Console, generative AI report | Whether cluster pages appear in AI features |
| Clicks to service pages | Analytics, internal link clicks | Whether learning turns into consideration |
| Enquiries from cluster visitors | CRM, with source tracking | Whether the cluster produces business |
Google says its Search Console generative AI performance report was available to all websites worldwide by 31 August 2026, which makes the third row possible for most sites. Connect the last row to your CRM using the approach in our marketing analytics and attribution guide.
Expect clusters to take months, not weeks. New pages need to be discovered, indexed and tested by search engines. Review the cluster each quarter.
How do you keep a cluster up to date?
- Quarterly: check each page’s queries in Search Console; add sections for new questions; fix broken links.
- Every six months: refresh statistics with newer sources; update the “last updated” date only when the content truly changes.
- Yearly: review the whole cluster map; merge pages that overlap; retire pages that no longer fit your offer, with redirects.
- When anything changes: a platform update, a new Google policy or a change to your service should trigger an update to the affected pages.
A simple rule of thumb: if a page in the cluster has had no impressions at all after six months, and it is indexed, it probably either targets a question nobody asks or duplicates another page. Review it before writing anything new.
What topical authority cannot do
A cluster improves your chances; it does not guarantee rankings or AI citations. Strong competitors, a young domain, technical problems or weak external reputation can all hold a good cluster back. Fix technical foundations first with the SEO audit checklist, and build external credibility honestly, as described in our link building and digital PR guide.
Frequently asked questions
Is topical authority a Google ranking factor?
Google does not publish a “topical authority” score. The term describes the effect of covering a subject thoroughly and reliably, which aligns with Google’s guidance on helpful, people-first content.
Should the hub be a guide or a service page?
Either can work. For commercial topics, a service page can act as the hub with guides as spokes. For broader educational topics, a hub guide is usually clearer. Avoid making one page try to do both jobs badly.
How long should each supporting page be?
Long enough to answer its question completely. For most guides that is 1,500 to 3,000 words, but length is a result of completeness, not a goal in itself.
Can I use AI to write cluster content?
AI can help with research and drafting, but each page needs review and real expertise from a person who knows the work. Google’s spam policies target scaled, low-value content regardless of how it is made.
How many clusters should a small business build?
Start with one cluster for your most important service. Finish it properly, then move to the next. Two strong clusters are better than five half-built ones.
What should I do with old blog posts that do not fit any cluster?
Review their traffic and links. Posts with value can be updated and linked into the closest cluster. Posts with no traffic, no links and no relevance to your offer can be merged into a related page or removed with a redirect to the nearest relevant page.
Sources and further reading
- Google Search Central: Creating helpful, reliable, people-first content.
- Google Search Central: Spam policies for Google web search, including scaled content abuse.
- Google Search Central: AI features and your website.
- Search Console Help: Generative AI performance report.
- Google Search Central: SEO link best practices.
Want a cluster plan for your main service? Bargaon’s SEO, AEO and GEO service maps the questions your buyers ask, plans the hub and spokes, and helps your team write pages that deserve to rank.