How to make Google consider subdomain as part of the main website in SEO?

Question

I have a well ranked website on Google and Bing. In the last few months I've been feeding a blog for my webpage and now I'm trying to rank it on Google and Bing just like I did with my website.

Unfortunatelly, for some technical reasons, I can't set the blog URL like this:

http://www.example.com/blog/(posts-permalinks)

In that way, it would be considered as a part of the website. So, I use subdomains, like:

http://blog.example.com/(posts-permalinks)

As far as I know, Google considers them as different sites, but I wish I could tell Google that they're the same website.

Is there anyway to do that?

Answer 1

Google will automatically treat subdomains as part of the main site when:

• They have related content
• They are written by the same person or company
• They link to each other

From Vanessa Fox, an ex-Google employee:

Google is no longer treating subdomains (blog.widgets.com versus widgets.com) independently, instead attaching some association between them. The ranking algorithms have been tweaked so that pages from multiple subdomains have a much higher relevance bar to clear in order to be shown.

Here is a list of things you can do from Do subdomains help/hurt SEO?:

• Link between the subdomain and the main site in the navigation menu, and visa-versa.
• Put the same copyright statement on the bottom of each
• Link each to the same terms of service, privacy policy, and contact page
• Use the same logo on each
• Use the same look and feel: colors, fonts, and layout
• Add the subdomain to the same account in Google Search Console
• Use the same Google Analytics and adversiting accounts (such as AdSense) on each