How to Cluster Keywords Into Pillar and Supporting Pages

How do I cluster keywords into pillar and supporting pages?

To cluster keywords, group your list by the topic and intent behind each term, pick one broad “pillar” keyword to anchor each group, assign the narrower keywords to individual supporting pages, then link every supporting page to the pillar and back. The result is a topic cluster — one hub page surrounded by focused spokes.

This is how a pile of keywords becomes a site structure that ranks. Instead of ten random posts fighting each other for attention, you build one authoritative hub and a set of deep-dive pages that reinforce it. Below is the exact process, a worked example, and the linking mistakes that quietly waste the effort.

Why clustering matters for a small business

Clustering works because search engines reward topical depth, not scattered one-off posts. HubSpot’s own research on the model reported that pages organized into topic clusters, with a pillar page and supporting content interlinked, drove a measurable lift in rankings across the linked pages — the more the cluster linked internally, the better the whole group performed. A single strong post is fragile; a connected cluster compounds.

It also protects you from the most common outcome in SEO: publishing into the void. Ahrefs found that 96.55% of content gets no traffic from Google, often because isolated pages carry no topical authority and no internal links pointing to them. Clustering fixes both — every page you publish now supports and is supported by the others, so a new post launches with backup instead of alone.

“We had 40 blog posts and none of them ranked. We didn’t write more — we grouped them into five clusters, built a pillar page for each, and linked them up. Within a few months the pillars were on page one.” — Aisha Rahman, marketing lead at a services firm (illustrative).

How to cluster your keywords into pillars and spokes

You can cluster an existing keyword list in a couple of hours with a spreadsheet. Here’s the order.

1. Start with a full keyword list grouped loosely by theme

Gather your keywords in one sheet — from Google Search Console, free keyword research tools, and “People Also Ask.” Then do a rough first pass, dragging obviously related terms near each other: everything about “email marketing” in one area, everything about “SEO” in another. Don’t overthink it yet; you’re just making the real clustering easier.

2. Group keywords by topic and intent, not just words

Now tighten the groups. Two keywords that share a word can belong to different clusters, and two that share none can belong together. “How to price a cleaning job” and “cleaning quote calculator” belong in the same cluster even though the wording differs, because they serve the same underlying job. Group by what the searcher wants, and split a group the moment its intent diverges — informational terms and buying terms rarely share a page.

3. Pick one broad keyword as the pillar for each group

Within each cluster, choose the widest, highest-level term as the pillar — the one that could plausibly cover the whole topic. For a cleaning business, “how to start a cleaning business” is a pillar; “how to price a cleaning job,” “cleaning business insurance,” and “cleaning supplies checklist” are spokes beneath it. The pillar targets the broad head term; the spokes target the specific long-tail questions.

4. Assign each remaining keyword to one supporting page

Give every narrower keyword its own supporting page, and keep it to one primary keyword per page. Resist the urge to stuff five spoke topics into one post — each deserves its own focused URL so it can rank for its specific query. If two keywords are near-identical (mere phrasings of the same question), merge them onto one page; if they’d each need a different answer, split them. Our guide on how many keywords one post should target covers where that line sits.

5. Confirm each pillar is actually worth building

Before you commit weeks of writing, sanity-check the pillar keyword: does it have real search demand and beatable difficulty? A cluster is a big investment, so you don’t want to anchor it to a term nobody searches or one you can’t rank for. Run the checks in our guide on whether a keyword is worth targeting on the pillar term specifically — the spokes can be lower-volume, but the pillar should earn its central spot.

6. Link every spoke to the pillar — and the pillar to every spoke

This is the step that makes it a cluster rather than a folder. Each supporting page links up to the pillar with descriptive anchor text, and the pillar links down to each supporting page. This tells search engines the pages belong together and routes authority through the group. Skip it and you have unrelated posts; do it and you have a structure that lifts every page in it.

7. Publish the pillar and spokes, then expand over time

You don’t need all ten pages live on day one. Publish the pillar and a few spokes, then add supporting pages as you write them, linking each new one into the cluster. Clusters are meant to grow — every future post either extends an existing cluster or starts a new one, which keeps your whole site organized instead of sprawling.

A worked example

Say you run a bookkeeping service. Here’s one cluster:

• Pillar page: “Small Business Bookkeeping: A Complete Guide” (targets the broad term small business bookkeeping) — a long, thorough hub that introduces every subtopic and links out to the spokes.
• Supporting page: “How to Reconcile Your Bank Accounts” (bank reconciliation)
• Supporting page: “Cash vs Accrual Accounting for Small Businesses” (cash vs accrual)
• Supporting page: “How Much Does a Bookkeeper Cost?” (bookkeeper cost — a decision-stage term)
• Supporting page: “Bookkeeping Software for Freelancers” (bookkeeping software)

Each spoke links up to the pillar (“part of our complete guide to small business bookkeeping”), and the pillar links down to each spoke where it introduces that subtopic. That’s a topic cluster: one hub, several focused spokes, all wired together.

Common mistakes that weaken a cluster

A few traps make a cluster underperform:

• Grouping by keyword string instead of intent. Terms that share a word can want different pages; terms that share none can want the same one. Cluster by what the searcher needs.
• Overloading the pillar. A pillar that tries to fully answer every spoke leaves nothing for the spokes to rank on — and you end up competing with yourself. Keep the pillar broad; let spokes go deep. This self-competition is a form of keyword cannibalization worth avoiding.
• Forgetting the internal links. The links are the cluster. Unlinked pages on the same topic are just a folder, and HubSpot’s research tied the ranking lift specifically to the interlinking.
• Making every page a blog post. Some spokes are informational posts; a decision-stage spoke like “bookkeeper cost” or a service page belongs in the cluster too. Match each page’s format to its intent.
• Building a cluster no one searches. A beautiful structure around a dead topic still gets no traffic. Validate the pillar’s demand before you invest.

Where tools fit

You can cluster entirely by hand — a spreadsheet, your keyword list, and good judgment about intent are the whole toolkit. Paid suites like Semrush and Ahrefs offer keyword-grouping and “parent topic” features that speed up the sorting on big lists, and they’re worth it once you’re clustering hundreds of terms across many topics.

Full disclosure: ScoutRival is our tool, and it won’t do the clustering thinking for you — that’s judgment work. Where it helps is executing the plan: once you’ve mapped a cluster, ScoutRival’s BlogCraft drafts each pillar and spoke as a full SEO article you publish to WordPress in one click, its SEO audit scores the pages, and it checks your AI visibility across ChatGPT and Google Gemini on demand (no invented “rank,” no scraping). It also monitors competitors’ website and social, so you can see which clusters they’ve built and where the gaps are. It is not a CRM, scheduler, or review monitor. Plans run Free, $29, $89, and $149/month. If you’re new to the whole process, start with our keyword research for beginners walkthrough, and browse the wider SEO library for more.