Topic Clusters SEO
A topic cluster is an SEO content structure where one broad pillar page supports and links to multiple cluster pages that cover related subtopics in depth.
What I’d do first
- Pick a topic broad enough for 5+ subtopics but narrow enough to own.
- Audit existing content before creating new pages.
- Map subtopics and plan internal links before writing.
- Track cluster performance as a group, not individual pages.
- Update and expand your cluster over time.
The path I'd take
- Choose your pillar topic — one broad theme that aligns with your business goals and has search volume.
- Research subtopics — use tools like Ahrefs or Semrush to find long-tail keywords and questions people ask.
- Create the pillar page — write a comprehensive overview that links out to each planned cluster page (even if they don't exist yet).
- Write cluster pages one by one — each covers a specific subtopic in depth, linking back to the pillar and to other relevant cluster pages.
- Update and expand — add new cluster pages over time, refresh outdated ones, and keep the pillar page current.
- Track cluster performance — monitor rankings and traffic for the whole group, not just individual pages.
Watch-outs
- Don't pick a topic that's too narrow — you won't have enough subtopics to build a cluster.
- Don't publish cluster pages without linking them back to the pillar — that's the whole point.
- Don't create overlapping pages that target the same intent. Each cluster page should have a unique angle.
- Don't treat it as a one-time project — clusters need maintenance: add new pages, update old ones, and refresh the pillar.
What I got wrong
I used to write standalone blog posts targeting individual keywords. They ranked okay, but I never built real authority. When I first tried topic clusters, I picked a topic that was too broad ("digital marketing") and ended up with a pillar page that was too generic and cluster pages that didn't connect well. I also forgot to cross-link cluster pages to each other, so the structure was weak. Now I start with a focused topic, map subtopics first, and link everything deliberately.
Next step
Quick answers
How many cluster pages do I need for a topic cluster?
There's no fixed number, but aim for at least 3–5 cluster pages to start. The key is covering distinct subtopics without overlap.
Can I turn existing blog posts into a topic cluster?
Yes. Audit your current content, identify a broad pillar topic, and reorganize existing posts as cluster pages with proper internal links.
Do topic clusters still work in 2025?
Yes. Google's emphasis on topical authority and helpful content makes clusters more relevant than ever. Just keep updating them.
Sources
Primary documentation is linked directly. Anything commercial is marked nofollow.
- Google Search Central — Best primary source for how Google understands content, internal links, and helpful content principles.
- HubSpot Topic Clusters research — Foundational industry explanation of topic cluster planning and content grouping.
- Moz Topic Clusters guide — Well-known SEO reference with practical workflow ideas for auditing and grouping content.
Notes from Callum Bennett.