Thematic authority: how do you build it with a semantic silo?

In brief: A semantic silo builds thematic authority by linking a central page to satellite pages, each of which addresses a distinct need of the audience, through internal linking crawlable. This authority remains an editorial goal that can be measured over time, never a score officially guaranteed by Google.

You already know what a semantic silo is. What's often missing is a concrete method for turning this architecture into a genuine authority lever, rather than a simple linking exercise. This guide walks through the steps, from defining the initial scope to a fully built example.

Prerequisites before building your semantic silo: scope and vocabulary

Before opening any planning document, two clarifications will help you avoid most false starts. The first concerns the exact definition of the method. The second distinguishes what you're actually trying to achieve: credibility, not a score.

What a semantic silo is (and isn't)

A semantic silo is an SEO structuring method made public in France in 2012 by consultant Laurent Bourrelly. It organises internal linking, in other words the links between pages on the same site, around the relationships between content rather than around a simple menu hierarchy.

In practice, the method is based on the principle that a set of pages linked coherently conveys a site's relevance better than a collection of isolated pages. On the scale of a specific topic, it applies the broader principles of the semantic silo in SEO: group content by intent, then link it so that none of it remains isolated without a useful connection.

The key figure

2012 is the year Laurent Bourrelly made the semantic silo method public in France, presenting it as an internal linking technique organised around the relationships between content.

Thematic authority: an editorial goal, not a Google score

Here,thematic authority refers to an editorial and SEO goal: being useful and credible on a coherent topic in the eyes of both readers and search engines. It is not a score officially named or guaranteed by Google, and no silo, however well built, obtains it automatically.

Google does not present expertise, authority and trustworthiness, often summarised by the acronym E-E-A-T, as an isolated, measurable ranking factor. Its guide on creating helpful content instead explains that its systems combine numerous signals to identify trustworthy content. A silo's structure can make content easier to discover and understand, but it does not replace either its quality or the other signals taken into account.

A word of caution

No provider can legitimately promise a thematic authority score measured by Google: this named metric does not exist among the search engine's public criteria.

The most reliable starting point remains a topic that is coherent with the site's activity and audience, not an arbitrary list of keywords gathered from a third-party tool. Once this scope is defined, the next step is to list the words, phrases and questions actually used by this audience. Queries already visible in Search Console often provide concrete leads: they show what users type to reach your existing pages, even before you launch a new keyword research effort.

Step 1: map intents and define the scope of the silo

First action: identify the main topic that will become the silo's central page. This topic must be able to break down into several distinct needs, otherwise the entire structure has no reason to exist.

Second action: list the sub-intents based on the vocabulary gathered during the prerequisite stage. An audience searching for a given topic never asks just one question: they seek to understand the topic, compare options, look for a practical method, or wonder about a specific case. These variations in phrasing represent as many potential needs for your future pages.

Third action: assign a distinct need to each future page. The central page summarises the topic and directs readers to more detailed content. The satellite pages delve into questions, comparisons, steps or use cases that would not fit within a summary response.

One final, often overlooked check: eliminate potential duplicates before writing a single line. A single topic should not be artificially split into several nearly identical pages solely to multiply URLs. If two page ideas address the same need with the same level of depth, it is better to merge them than to duplicate them.

Step 2: build the relational architecture and internal linking

First action: check that every important page in the silo can be reached from at least one other page on the site, via a crawlable internal link. This is the minimum condition for these pages to be discovered and understood in context.

This link must be implemented using an HTML <a> element with an hrefattribute. Other formats, such as a menu generated purely by script or a button without a dedicated tag, are not always reliably extracted when the site is crawled.

Good to know

A link that is visually displayed but built without a <a href> tag can remain invisible to site crawling, even if it works perfectly when clicked by a human visitor.

Anchor text and link placement

Where a link is placed matters as much as its presence. Place it in a useful editorial context, where it naturally answers a question the reader has at that specific point in the text. A descriptive anchor, one that explains what the linked page contains, serves both the reader and the search engines' understanding of the topic.

There is no universal ideal number of links per page. Relevance and readability remain the priority: three genuinely useful links woven into the text are worth more than a list of ten links tacked on at the end of an article with no logical connection to the preceding paragraph.

The (limited) role of the sitemap

On a large site, an XML sitemap can complement the setup by signalling the existence of certain URLs. It does not replace genuine navigation: it guarantees neither the immediate crawling nor the indexing of every page it lists. An important page must remain reachable through a genuine link, not merely listed in a technical file.

At this stage, the overall logic can be summed up simply: the semantic silo is the method that organises content, internal linking is the technique that physically connects pages to one another, and thematic authority is the editorial goal this organisation seeks to serve. Once this architecture is in place, it becomes possible to visualise it through a concrete example.

Step 3: walk through a concrete mini-silo example, from topic to linking

Let's take a topic consistent with a financial site's activity: mortgage lending. This choice illustrates the method without depending on any particular sector; the same logic applies to any field, as long as the central topic breaks down into distinct needs.

First action: list the sub-intents identified in Step 1 for this topic. Four distinct needs emerge here, a suitable number for a clear, readable mini-silo:

• Choosing between a fixed rate and a variable rate

• Understanding the guarantees required by borrower insurance

• Calculating a monthly repayment simulation

• Knowing when to consider a loan buyback

Second action: build the central page and the corresponding satellite pages. The central page, "Mortgage lending: understanding and comparing offers," summarises a borrower's journey and directs readers to each area of further detail. The four satellite pages each address one need without overlapping with the others.

Mini-silo diagram

This diagram illustrates a simple rule: every satellite page links at minimum to the central page, and some link to one another when one topic naturally sheds light on another, such as insurance costs, which directly affect a monthly repayment simulation.

Examples of contextual anchors

Here are three examples of anchors that link these pages within an editorial context, rather than as a simple list of links:

• From the central page: "the guarantees often required by banks for borrower insurance"

• From the page on rates: "estimate the impact of this choice on your monthly repayments"

• From the insurance page: "how the cost of this cover changes a monthly payment simulation"

Each anchor describes what the reader will find behind the link, avoiding generic phrases such as "click here" that provide no information about the linked resource.

Step 4: strengthen the editorial credibility of each page in the cluster

A well-connected architecture isn't enough if every page remains superficial. Topical authority is built through original information, substantial analysis, clear sources and visible proof of experience or expertise on the subject covered. A page that merely rephrases what already exists elsewhere adds nothing new to the cluster, however well it's linked.

Avoid the temptation to create a page for every search variant, or to publish content in bulk purely to inflate the number of pages. Page count alone does not increase a site's perceived quality or relevance: a cluster of four solid pages is worth more than one of fifteen redundant pages.

Finally, keep a clear editorial objective and an identifiable audience. A topic that seems to promise short-term traffic but strays from the site's genuine expertise or usual audience weakens overall coherence more than it strengthens it.

Step 5: measure and sustain the cluster over time

A cluster isn't built once and for all. Track its effectiveness by page groups and by queries in Search Console: impressions, clicks and associated queries give a realistic picture of what's working, page by page rather than for the main topic alone.

Then compare this data with engagement and conversions in Analytics, where conversion goals exist on the site. A page receiving clicks without generating engagement deserves a review of its content or its place within the internal linking.

If a drop occurs after deploying or restructuring a cluster, compare the periods concerned, identify the most affected pages, and distinguish a global issue from one limited to a specific group of content. A drop in visibility does not, on its own, prove that the cluster's architecture is at fault: it may stem from a technical factor, a shift in the topic covered, or a broader change on the site.

Common mistakes to avoid when building a semantic cluster

Certain mistakes recur regularly, regardless of the site's sector. Recognising them early avoids having to rebuild an entire architecture a few months later.

Practical tips for a semantic cluster that builds lasting authority

Prioritise pages according to their strategic importance before multiplying satellite pages. One solid core page, linked to two or three genuinely useful satellite pages, serves authority better than a dozen superficial pages added hastily.

• Periodically review the internal linking as new pages are published on the site

• For each page, document the proof of expertise or experience provided: cited source, identifiable author, data used

• Regularly check Search Console reports to adjust the cluster's scope if new intents emerge

A semantic cluster that stands the test of time looks less like a one-off project and more like a well-tended garden: a page is added when a genuine need justifies it, a link is revised when related content appears, and anything that no longer adds value is removed. It's this discipline, more than the number of pages produced, that builds topical authority verified through results rather than through a promise.

Also worth reading: Topic cluster or semantic cocoon: what's the difference?.