What a topic cluster is
A topic cluster is a group of pages organised around one subject. The centre is a pillar page that covers the subject broadly and points to the commercial offer. Around it sit cluster pages, each of which answers one narrower question in full and links back to the pillar and to the closest related cluster pages.
For B2B, the structure matters because the buying decision is spread across several questions. One person asks what a service costs. Another asks how long results take. A third asks how to tell whether the work is paying off. A site with one service page answers none of those in depth. A site with a cluster answers each one on its own page, and links them so a reader can move from question to decision without leaving the site.
The structure is also a way of deciding what not to write. If a proposed article does not link to a pillar, does not answer a question a buyer asks, and does not have a clear place in the set, it probably does not belong on the site.
Start with the pillar
Choose the pillar first. For a B2B SEO agency, this is usually the service page, because it is the page that should win the commercial search and close the enquiry. If the service has more than one main offer, give each its own pillar rather than forcing all of them into one page.
The pillar should explain the service in full: what it includes, who it is for, what it costs in outline and how the work is run. It should not be a long list of links. The cluster pages do the detailed explaining. The pillar gives them a home.
Test the pillar before you build around it. Ask whether a reader who knows nothing about the service would understand it after one page. If the answer is no, the cluster will not fix that.
Build the cluster from buyer questions
Collect the questions before you name any page. Use three sources: the discovery calls your sales team has, the enquiries that come through forms and email, and the search queries that bring visitors to the site. Group the questions by the stage of the decision they belong to, from "is this a problem we need to solve" to "which provider should we pick" to "how do we know it worked".
Each group becomes a candidate cluster page. Each question inside the group becomes a section or, if it is large enough, its own page. Keep the number small at first. Three or four cluster pages that answer their questions well do more than twelve that repeat each other.
Give each page one search
Every cluster page owns one primary search. That keeps the pages from competing. Two pages on "B2B SEO cost" with slightly different titles will both struggle. One page on the cost, and one on what the cost includes, each with its own primary search, can both rank.
Before you approve a new page, check the live site and the content calendar for any page that already owns the search. If one does, update that page instead of publishing another.
Link with a reason
Links inside a cluster should be in the body of the text, next to the sentence that makes the reader want the other page. A list of related links at the foot of each page helps navigation a little and adds almost nothing to understanding. Use both, but make the in-text links the main ones.
The rule for linking is simple. From each cluster page, link to the pillar once and to the one or two cluster pages a reader would most likely need next. From the pillar, link to every cluster page, in the order a buyer would read them.
An illustrative build
Suppose a B2B software company wants to rank for its outsourced SEO service. The pillar is the service page. The buyer questions, gathered from calls, include what the work covers, how long it takes to show results, what the reporting looks like and how the team should choose a provider.
Four cluster pages follow from that list. One explains what the service covers and what it does not. One sets out how long results take, with the dependence on the sales cycle made clear. One covers reporting for a senior audience. One is a checklist for choosing a provider. Each page has one primary search, links back to the pillar in the body, and links to one neighbouring page. The pillar links to all four.
The example is illustrative. The point is the shape: one commercial page, four questions, each answered once.
The link map for that cluster is short enough to check at a glance:
| Page | Primary search | Links out (in the body) | Links in |
|---|---|---|---|
| Pillar: service page | the service name | to each cluster page, in reader order | from each cluster page |
| Cluster 1: what the service covers | what the service includes | pillar; cluster 2 | pillar; cluster 2 |
| Cluster 2: how long results take | how long the service takes | pillar; cluster 3 | pillar; cluster 1 |
| Cluster 3: reporting for leadership | reporting for leadership | pillar; cluster 4 | pillar; cluster 2 |
| Cluster 4: how to choose a provider | how to choose the provider | pillar; cluster 1 | pillar; cluster 3 |
Every page has one primary search, a link back to the pillar, and a path to the next question. If a row were missing its incoming links, the page would be an orphan and the fix would be a link, not a rewrite.
The sequence matters as well as the links. A reader who lands on cluster 2 first will often want to know what is included, so cluster 1 should be one click away. Write the pages in the order a buyer reads them, not the order they came to mind.
Map the links before you write
Once the pages are chosen, draw the link map on paper or in a spreadsheet before any draft starts. Each row is a page. Each column is a link: to the pillar, to the page before it in the reader's path, to the page after it, and to any page that answers an objection. A page with no incoming links from the set is an orphan, and orphans rarely earn rankings or enquiries.
The map also shows where the cluster is thin. If one cluster page has four outgoing links and another has none, the second page is probably not connected to the question it answers. Fix the map first. Editing sentences rarely fixes a structural gap.
Keep the cluster from sprawling
A cluster grows whenever someone has a new idea. Set a rule for adding pages. A new page should answer a question sales hears often, have a primary search no existing page owns, and have a clear place on the link map. If it fails any of those tests, it becomes a section of an existing page or it is dropped.
Review the cluster every quarter. Look for pages that have not earned a visit in six months, pages that answer a question buyers no longer ask, and pairs of pages that now compete. Merge, redirect or rewrite them. A smaller cluster that is current does more work than a larger one that nobody maintains.
Measure honestly
Search engines do not publish a topical authority score, and no tool reliably reports one. Measure the cluster by what you can see.
- Rankings for the set. Track the primary search for each page, not only the pillar. Look for pages moving up together over a quarter.
- Enquiries from the cluster. Ask the sales team which pages the enquiry came through, or set up the form to record the page that was read before it.
- Coverage of the buyer questions. Each quarter, check whether the questions from sales are answered on the site. A question with no page is a gap.
- Pages that cannibalise. If two pages swap positions for the same search, one of them needs changing.
A cluster that is not moving on these measures after two or three quarters is usually either too broad, too thin, or pointed at questions buyers do not ask.
Common mistakes
- Too many pages too early. A large cluster of thin pages is harder to maintain than a small one that is complete.
- A pillar with no commercial purpose. If the pillar does not lead to the service, the cluster earns traffic but no enquiries.
- Overlapping pages. Two pages that answer the same question compete with each other. Merge them.
- Links added only at the bottom. Readers rarely reach the end of a page. Put the links where the reader needs them.
- Clusters built from keyword lists alone. A list of terms with similar wording does not make a set of questions a buyer will ask.
Where to start
Pick the service you most want to win. Write the pillar, then list the five questions sales hears most. Build the three cluster pages that answer the most common questions, link them both ways, and measure them for a quarter before you add more. The B2B content marketing page explains how this fits with the rest of the content plan, and the brief template shows how to plan each page before it is written.
How the links between those pages should be planned and audited is covered in internal linking for large B2B sites. For a review of which clusters your site already has and where the gaps are, the B2B SEO services team can run it as part of a free audit.