Definition
What is authority pooling?
Authority pooling is the fact that the trust signals a domain accumulates (links received, history) benefit every page it hosts. A second site version placed under the same domain, in a subfolder, inherits that track record from the day it goes live. A separate domain starts from zero and must rebuild that reputation on its own, which takes years.
What is shared under one domain
A domain accumulates trust signals over the years, mainly through the links it receives from other sites and the history it carries. Those signals do not stay on the page that received them: internal linking circulates them among the domain's pages. A new section added under that domain benefits from day one.
A new domain receives none of that track record. Its first links, its first mentions and its history are built from zero, while maintenance of the first domain continues.
Subfolder, subdomain or separate domain
Google documents the three structures without preferring one:
- The subfolder (yourdomain.com/en/) is easy to set up and needs little maintenance. It is the structure that shares the domain's track record most directly. In return, geographic intent is barely visible, the server has a single location, and a future separation is more complex.
- The subdomain (en.yourdomain.com) is easy to set up, allows several server locations and separates easily. Geographic intent cannot be read from the URL alone.
- The separate domain, often a country-code domain such as .ca, gives clear geographic targeting and separates easily. Google also cites its cost, its limited availability, its strict registration requirements and the fact that it targets only one country. It starts from zero.
Google specifies that it does not vary the location of its crawler to discover a site's regional variants: the versions must be declared, whatever the structure.
When to give up pooling
The structure that shares authority best is also the one that is hardest to separate: moving a version that has lived in a subfolder for three years requires a full migration. Four situations therefore justify a separate domain or subdomain:
- a legal obligation to host data in the target territory;
- a distinct brand for the other market;
- a planned sale of one of the two businesses;
- a platform that imposes one store per market, with its own domain.
The fear that the English version will hurt the French version is not one of them: that risk comes from a missing declaration of versions, not from the structure.
Fictional example: for ten years, a Quebec manufacturer has been receiving links from its distributors, its industry association and regional media. It opens Ontario with an English version of its site.
Placed in an /en/ subfolder of its domain, the English version benefits from those links as soon as it goes live. It also shares the template, the measurement setup and the security certificate of the existing site. Placed on a new domain, it would start without a single link. Every change (a return policy, a template, a certificate) would then be made twice.
We read authority pooling as an asset already paid for: the subfolder lets you cash it in as soon as the new version goes live, while a separate domain forces you to buy it back with time nobody puts in the plan. That is why the subfolder is our default choice for a Quebec business opening a second market, outside the four situations that justify a separation.
Two nuances apply. Pooling does not replace local authority: in the new market, mentions from directories, associations and media are built on the ground. The decision also rests on three numbers: the annual cost of a second site, the margin expected from the target market and the risk of losing original revenue during a possible migration.
Not to be confused with
- Domain authority score
- The authority scores shown by tools such as Moz, Ahrefs or Semrush are estimates calculated by those tools, not Google data. Authority pooling describes a mechanism: a domain's track record benefits the pages it hosts.
- Internal linking
- Internal linking circulates authority among the pages of a single site. Authority pooling describes what a new section inherits when it is placed under the same domain.
- Non-transferable asset
- A non-transferable asset (name recognition, referral network, local social proof) stays in the territory where it was built. A domain's track record follows a new section placed under that domain, without replacing the name recognition to be built in the new market.
Related concepts
- Language cannibalization
- Internal linking
- Non-transferable asset
- Market entry cost
- Market vocabulary gap
- Secondary market
- Technical SEO
Further reading
- One domain or several for two markets: how to choose
- Multilingual stores: coordinating translation, URLs and SEO
- A .ca domain and international SEO: how does it affect visibility?
- Hreflang: helping Google choose your French or English page
- Shopify Markets: entering a market without duplicating your store
- Website migration: planning redirects and protecting SEO
Related services
Frequently asked questions
Subfolder or subdomain for our English version?
The subfolder suits most businesses: it inherits the domain's track record and needs little maintenance. The subdomain becomes preferable when a legal or technical constraint requires a separate server, or when a separation is already planned.
Would a second domain for the United States help us?
Rarely. A second domain doubles the editorial work and the maintenance. It also starts without the first one's track record. Google reads a country-code domain like .ca as a strong signal that the site targets Canada: to also target the United States, the common solution is a generic domain with one subfolder per market, chosen before expanding rather than after.
Can we change structure later?
Yes, but the price depends on the starting point. A separate domain or a subdomain detaches easily. A subfolder requires a full migration, with its redirect plan and a risk of traffic loss while Google recrawls the URLs.
