Silos SEO
An SEO silo is a website architecture method that groups closely related pages into themed sections so search engines and users can understand the site’s topic structure more easily.
Key takeaways
- Silos group related content to improve topical relevance and internal linking.
- Modern silos are flexible – not rigid blocks.
- Plan silos before writing content for best results.
- Avoid thin pages and over-isolation.
Think of each silo as a focused library section dedicated to one broad topic.
Example
A travel site might create a silo for “Hiking in Patagonia”:
- Pillar page: Patagonia Hiking Guide (covers routes, seasons, permits)
- Supporting pages: Best Patagonia Hiking Trails, Packing for Patagonia, Patagonia Safety Tips
- All pages cross-link to the pillar and each other, forming a coherent topic cluster.
When should I use this?
- You have a large content set (50+ pages) around a broad topic.
- Your site has clear categories (e.g., e-commerce departments, blog categories).
- You want to build topical authority for a specific subject.
- You’re planning a new site or restructuring existing content.
What it is not
- A rigid barrier – silos should not block useful links between related topics.
- A content shortcut – thin pages inside a silo still need real value.
- A URL trick – folder structure alone won't create a silo without internal linking.
- A replacement for quality content, crawlability, or overall site architecture.
Quick start
- Map your topics – list head terms and subtopics.
- Assign a pillar page – the main landing page for the head term.
- Create supporting pages – each focused on a subtopic.
- Link consistently – link supporting pages to the pillar and to each other where relevant.
- Use descriptive URLs – include the topic in the path (e.g.,
/patagonia-hiking/trails/).
Common mistakes
- Treating silos as sealed sections – avoid over-isolation; keep helpful cross-links.
- Building silos without keyword mapping – start with research, not folder names.
- Creating thin supporting pages – each page must add real value.
- Using silos as a band-aid – fix basic architecture issues before adding silo structure.
Next step
FAQ
Are SEO silos the same as topic clusters?
They are very similar. Modern SEO often treats silos as a synonym for topic clusters or hub-and-spoke structures, rather than rigid isolated sections.
Should I silo my entire website?
Only content-heavy sections benefit most. Avoid siloing thin pages or forcing unrelated content into a silo.
Related topics
Sources
- Google Search Central — Best source for Google’s guidance on site structure, internal linking, and crawl/index understanding.
- Ahrefs Blog — Clear modern critique of rigid siloing and useful framing versus topic clusters.
- Semrush Blog — Concise definition of silo SEO and its traditional isolated-linking model.
- Bruce Clay — Longstanding SEO reference explaining silo architecture and implementation.
Reviewed by Lucía Marín, Founding editor.