Topic Cluster Architecture — Pillar and Spoke Content Strategy

What Topic Clusters Are

A topic cluster is a group of semantically related pages organized around one central pillar page. The pillar page covers the broad topic at a high level. Spoke pages cover specific sub-topics in depth. All spokes link back to the pillar; the pillar links to all spokes.

Topic clusters serve three SEO functions:

1. Topical authority signaling — collective entity coverage proves expertise to Google
2. Internal PageRank concentration — interconnected pages amplify authority
3. Query coverage expansion — each spoke targets distinct sub-queries the pillar cannot serve alone

Pillar Page Design

The pillar page covers the entire topic at moderate depth — comprehensive enough to be the authoritative hub, not so deep that it duplicates every spoke.

Pillar page criteria:

• Covers 10-15 sub-topics the site addresses
• Each sub-topic gets 150-250 words (not the full treatment — that's the spoke's job)
• Includes a link to the spoke page for every sub-topic covered
• Internally linked from homepage and main navigation
• Length: 3,000-5,000 words

H2 structure: One H2 per cluster topic. Each H2 section → 150-250 words → internal link to spoke with descriptive anchor.

Spoke Page Design

Each spoke page covers exactly ONE sub-topic from the pillar, at full depth.

Spoke page criteria:

• Covers one specific attribute/sub-topic only (narrow scope)
• Goes deeper than the pillar's treatment of this topic
• Contains 1 internal link back to the pillar (in main content body, not footer)
• May link to adjacent spokes (only if strong contextual overlap)
• Length: 1,500-3,000 words depending on topic depth

Topic Cluster Internal Linking Architecture

HOMEPAGE
   |
PILLAR PAGE (e.g., "Roof Replacement Guide")
   |      |      |      |      |      |
SPOKE 1  SPOKE 2  SPOKE 3  SPOKE 4  SPOKE 5  SPOKE 6
(Types) (Cost)  (Timeline) (Signs)  (Process) (Insurance)

Rules:

• PILLAR links OUT to all spokes (with descriptive anchor: "roof replacement cost in Florida")
• Every SPOKE links BACK to PILLAR (with anchor: "complete roof replacement guide")
• SPOKE to SPOKE links: only when directly complementary (e.g., Cost ↔ Insurance)
• No spoke-to-spoke links between unrelated sub-topics

Cluster Sequencing (Publication Order)

Publish in this sequence to maximize authority signal:

1. Publish PILLAR page first (establishes the hub)
2. Publish highest-volume spokes 2-4 within 2 weeks
3. Publish remaining spokes over following 4-8 weeks
4. Update PILLAR with links to new spokes as they publish

Do NOT publish all spokes simultaneously. Staggered publication signals organic editorial process.

Cluster Size Guidelines

| Site Size / Authority | Optimal Cluster Size | |----------------------|---------------------| | New site (< 6 months) | 1 pillar + 5-8 spokes | | Growing site (6-24 months) | 2-3 pillars + 6-10 spokes each | | Established site (2+ years) | 4-6 pillars + 8-15 spokes each |

Do not build more clusters than you can cover with depth. One strong cluster outranks three shallow clusters.

Topic Cluster vs. Koray Topical Map

These are compatible frameworks operating at different scales:

• Topic cluster = tactical content architecture for a specific keyword group
• Koray topical map = site-wide semantic content network for the central entity

A Koray topical map contains multiple topic clusters organized by core vs. outer section hierarchy. Each major attribute in the topical map may warrant its own topic cluster.

Cross-References

• koray-topical-map — macro-level architecture that topic clusters operate within
• internal-linking-optimizer — implementing cluster internal linking rules
• keyword-researcher — keyword research that defines cluster scope
• find-topics-to-write — identifying which clusters to build next

#seo-sop #seo #content-architecture #topic-cluster #pillar-pages #topical-authority