Pillar Content and Silos: A System, Not a Template

TL;DR: Pillar content SEO is not “write a huge guide and link everything to it.” The better model is a controlled topic system: one page earns broad trust, the silo keeps the site from drifting, and internal links tell Google which pages deserve to rank for which intent.

At mindnow, I used to treat pillar pages like prestige assets: long, polished, and annoying to maintain. On vadimkravcenko.com and now seojuice.com, I think about them differently. A pillar is the switchboard. The strategy is the system around it.

That ruins the usual framing. Most people who search for pillar content guidance arrive looking for a template. What they need is a boundary system. The page matters, but the edges matter more.

The pillar page isn’t the strategy — it’s the switchboard

A pillar page gets mistaken for the longest page on the site. That mistake creates giant guides that are too shallow for advanced readers and too broad for search engines. The page looks serious. The rankings do not follow.

A better definition is simpler. A pillar page covers the core topic enough to satisfy the broad query, then routes readers to cluster pages for depth. It should answer the first layer of questions, establish the model, and make the next click obvious.

“When considering whether something should be called a pillar page or not, ask yourself this: Would this page answer every question the reader who searched X keyword had, AND is it broad enough to be an umbrella for 20-30 posts?”

Leslie Ye, HubSpot Senior Content Strategist

That umbrella test is useful. It is incomplete. A page can be broad enough to qualify as a pillar and still be a weak SEO asset if the cluster around it is messy.

On seojuice.com, the internal linking content cannot be one monster article because “internal links,” “anchor text,” “crawl depth,” and “orphan pages” are different jobs. The pillar should connect them, not swallow them. I was wrong about this for years (I kept adding sections when I needed new URLs).

A good pillar does three jobs

1. It ranks for the broad, high-level topic.
2. It distributes authority to supporting pages.
3. It prevents readers and crawlers from treating the site like a random blog archive.

The mental model is clean: the pillar is the switchboard; the silo is the fence.

Pillars, clusters, and silos are not synonyms

A pillar is the broad page. A cluster is the group of supporting pages. A silo is the boundary that decides what belongs together and what should stay separate.

“SEO siloing is a search engine optimization technique that structures a website's content by grouping related webpages together in hierarchical categories based on how people search.”

Bruce Clay Inc.

Bruce Clay Inc. gives the classic definition — and it still holds. The problem is that the old silo conversation became too rigid. Folder structure helps, but the deeper question is how topics relate across the site.

A URL can sit in the right folder and still send bad signals if every article links sideways to unrelated content. A content team can publish under /seo/ and still build a pile of pages with no clear center.

“your time spent writing blog posts designed to rank for specific, long-tail keywords could be better spent elsewhere. Namely, on creating topic clusters.”

Sophia Bernazzani Barron, HubSpot Marketing

That cluster-first shift was correct. The next step is stricter: clusters need editorial limits. Without limits, “topic cluster” becomes a nicer name for a content calendar.

The useful distinction

If everything links to everything, you do not have a cluster. You have a maze.

Why silos matter more after the embedding conversation

Topical authority gets talked about like a magic badge. That is sloppy. The better reason to care about silos is more concrete: topical drift can be evaluated at page and site level (the May 2024 Google leak made this part less speculative).

“Google is specifically vectorizing pages and sites and comparing the page embeddings to the site embeddings to see how off-topic the page is.”

Mike King, Founder and CEO at iPullRank

“The siteFocusScore captures how much the site sticks to a single topic.”

Mike King, Founder and CEO at iPullRank

Do not turn that into a fake dashboard metric. Mike King was analyzing leaked Google documentation, and siteFocusScore is a real attribute name from that material (a leaked API field, not a public SEO score). The practical takeaway is not to obsess over a number. It is to stop publishing like the site has no center.

“Don't worry about it.”

John Mueller, Search Advocate at Google

Mueller’s pushback matters. Google representatives are right to resist buzzword SEO. “Topical authority” gets abused by people who want a theory for every ranking movement. Still, the editorial lesson survives: if your site claims one center and your links imply six centers, the site feels scattered.

The practical rule

Every cluster page should make the pillar more believable. If it does not, it belongs in another silo, another site section, or nowhere.

Many content teams do not have a content gap problem. They have a permission problem. They keep approving posts because the keyword has volume — even when the topic pulls the site away from what it should be known for.

Build the silo map before you write the pillar

The map comes before the article. This is the part that feels slow, so teams skip it and then call the pillar strategy broken.

Make four decisions before writing:

1. Core topic: the broad query the pillar deserves to target.
2. Subtopics: the supporting intents that need their own pages.
3. Exclusions: related topics that should not be in this silo.
4. Link rules: which pages can link to which other pages.

Take the internal linking silo. A possible pillar is Internal Linking for SEO. Cluster pages might include anchor text optimization, orphan pages, crawl depth, contextual links, sitewide links, and an internal link audit.

Adjacent topics are different: backlink outreach, technical SEO audits, content pruning, and general SEO content strategy. They can touch the internal linking conversation. That does not put them inside the silo.

Adjacent does not mean same. This matters for seojuice.com because internal linking touches almost every SEO problem. That does not mean every SEO article should be stuffed into the internal linking silo. The category would become useless.

The boundary test

A page belongs in the silo if the pillar would feel incomplete without mentioning it. A page does not belong just because you can force a link with a clever sentence.

For example, orphan pages belong in an internal linking silo because a pillar on internal links feels incomplete without them. Backlink outreach does not. You can write a sentence connecting backlinks to internal PageRank flow, but that does not make outreach part of the silo.

The 20 to 30 post trap

HubSpot’s “20-30 posts” benchmark is useful for mature topics. It is dangerous as a launch requirement.

Smaller sites can start with 5 to 8 strong support pages and expand when search intent demands it. Forcing 30 cluster pages on a young domain creates thin posts, repeated intros, and maintenance debt. Better to publish fewer pages that deserve links.

Decide what goes on the pillar and what becomes a cluster page

The pillar should answer the broad query and preview the subtopics. It should not satisfy every advanced query. If a subtopic has a distinct search intent, a different SERP shape, or a different conversion path, it deserves its own URL.

This is where the “ultimate guide” breaks. It tries to rank for the pillar keyword and every cluster keyword at once. The result is a page with no clear job.

Anchor text is a good example. A pillar on internal linking should explain what anchor text is and why it matters. It should not contain the entire anchor strategy. That belongs on a dedicated page because the reader problem is different.

Suggested pillar page anatomy

1. Definition and problem framing.
2. Quick model or diagram.
3. Main subtopics with short explanations.
4. Links to deeper cluster pages.
5. Examples from the site or business.
6. Common mistakes.
7. Maintenance notes.
8. Conversion block or next step.

Keep the pillar useful, not heroic. The reader came for orientation. Give them the map, then send them to the page that solves the next problem.

Internal links are the control system, not decoration

A topic cluster without link discipline — restraint is the work — is just a content calendar.

The pattern is simple. The pillar links to every major cluster page. Each cluster page links back to the pillar. Closely related cluster pages link to each other when the user need is real. Pages outside the silo link in selectively, not automatically.

“It's not the number, sheer number of links...It was the number of different types of links and the variety of anchor text that made the most significant difference.”

Cyrus Shepard, Founder of Zyppy SEO

That turns into practical anchor rules. Do not use the same exact-match anchor every time. Use anchors that describe the next step from the reader’s current context. “Internal link audit” is fine. “Find orphan pages before they rot” may be better in a troubleshooting article.

Four link types inside a modern silo

• Pillar-to-cluster links: use these for every major support page the pillar introduces.
• Cluster-to-pillar links: use these when the reader needs the broader model.
• Cluster-to-cluster links: use these only when the next page solves a connected problem.
• Supporting links from adjacent silos: use these when the adjacent page adds context without blurring the topic.

The key is intent. A crawl-depth article can link to orphan pages because the reader may need both problems solved in the same audit. A content pruning article can mention internal links, but it should not be treated as a child of the internal linking pillar.

What not to link

Restraint is part of architecture. If a page is only loosely related, do not link it from the pillar just because it exists. Bad internal links blur the topic and distract the reader.

This is also where old content causes damage. A blog post from three years ago may still link to every “related” article in a footer widget. That looks harmless. It can flatten your silo into a soup of weak associations.

Use pillar content to show expertise, not to cosplay authority

A pillar cluster does not automatically prove expertise. A shallow cluster can look manufactured. The expertise signal comes from coverage depth, original examples, clear ownership, and sensible page relationships.

“I personally believe that almost, if not all, of the core updates since early 2017 are focused on some element of E-A-T.”

Marie Haynes, Founder at Marie Haynes Consulting

At mindnow, client sites with real operational knowledge were easier to cluster because the boundaries already existed in the business. The SEO work was mostly translation: turn service knowledge into pages, connect the pages, and remove the parts that did not belong.

The weak version is easy to spot. A team reads about topical authority, commissions twenty articles, and calls the folder a silo. The pages repeat the same beginner explanations. No one owns the point of view. The links are decorative.

Signs your pillar is pretending

1. It defines basic terms for 3,000 words.
2. It links to thin posts that repeat the same intro.
3. It has no examples from the business.
4. It targets every keyword variation on one URL.
5. It has not been updated since launch.

The fix is not always more writing. Sometimes the fix is editing the system until the real expertise is visible.

How to measure whether the pillar and silo are working

Rankings matter, but they are late signals. Measure the system before you judge the headline position.

Track whether the pillar gains impressions for the broad topic. Track whether cluster pages gain impressions for specific subtopics. Track internal link clicks from the pillar to cluster pages. Track crawl depth, orphan pages, and cannibalization.

The pattern should make sense. Early on, the pillar may move first for broad impressions. Later, cluster pages should pick up long-tail visibility. If only the pillar grows and cluster pages stay flat, the support pages may be weak or poorly linked. If cluster pages rank but the pillar does not, the pillar may be too generic.

Useful checks

SEOJuice can bridge naturally into internal link audits here, but the point is bigger than a tool. The question is whether the site architecture is visible to a crawler (not the sitemap) and useful to a reader.

Common failure modes

Most pillar failures start with good intentions. The team wants depth, so the pillar becomes too long and too vague. The team wants coverage, so the cluster pages become rewritten subsections. The team wants order, so the silo mirrors company departments instead of how people search.

The worst pattern is universal linking. Every post links to every other post. It feels safe because no page is isolated. It fails because no relationship has weight.

Old content creates another leak. The team launches the new pillar, updates the new cluster pages, and leaves the archive alone. Then old posts keep pointing crawlers into outdated paths. The silo looks clean in the spreadsheet and messy on the site.

Adjacent topics also creep in because nobody says no. A keyword has volume. A competitor wrote about it. A sales call mentioned it. Suddenly the pillar is carrying pages that belong somewhere else.

Content pruning helps here. Sometimes the best move is not to write a missing cluster page. It is to merge two weak pages or remove a page that makes the topic look scattered. I have written exactly this kind of pillar before (it looked complete and ranked for nothing).

A 30-day plan for building a pillar and silo system

Week 1: Map the topic

Pick the pillar query. Collect existing URLs. Mark pages as core, support, adjacent, duplicate, or remove. Do not decide based on ego. Decide based on whether the page strengthens the topic.

Week 2: Design the cluster

Choose the first 5 to 8 cluster pages. Do not start with 30 unless the site already has the authority and editorial capacity to maintain them. Each cluster page needs its own intent, not just its own keyword.

Week 3: Write or rebuild the pillar

Build the pillar as an overview and routing page. Add short, useful sections for each cluster topic. Link only where the next click helps. This is the part teams skip and then blame the framework.

Week 4: Wire, publish, and audit

Add pillar-to-cluster links, cluster-to-pillar links, and selective sibling links. Check anchors. Check crawl depth. Check that no important support page is orphaned.

Then revisit the cluster quarterly. Pillars decay because the supporting pages change and nobody updates the hub. A pillar that points to stale pages stops acting like a switchboard and starts acting like a museum.

Frequently Asked Questions

What is pillar content SEO?

Pillar content SEO is the practice of building a broad page around a core topic, then supporting it with focused cluster pages and internal links. The pillar handles orientation. The cluster pages handle depth.

How many cluster pages does a pillar need?

There is no fixed number. Mature topics may support 20 to 30 posts, but smaller sites can start with 5 to 8 strong pages. Quality and fit matter more than reaching a quota.

Is a content silo the same as a topic cluster?

No. A topic cluster is the group of related pages. A silo is the boundary system that decides what belongs in that group, what should link together, and what should stay separate.

Can one page belong to two silos?

Sometimes, but be careful. If a page genuinely serves two topics, it may need links from both areas. If it exists because the team could not choose a target intent, split it or rewrite it.

Conclusion: modern pillar SEO is editorial restraint

Pillar content SEO is about deciding what the site is about, proving that topic through focused support pages, and using internal links to make the relationships obvious.

The bloated-pillar model is tempting because it feels productive. Add more sections. Add more keywords. Add more links. The modern version asks for the harder thing: boundaries.

The pillar gets attention. The silo earns trust. The links make the system legible.

Build the links that make your pillar work

If your pillar page is already live, the next step is not more writing. Audit the internal links, find the orphan pages, clean up anchor text, and confirm the silo is visible to a crawler — not just to your sitemap. SEOJuice is built for that job.