Hosting
Subdirectories vs subdomains
Subdirectories win for almost every case, because authority consolidates on one domain. Subdomains make sense when the content is genuinely a separate product, runs on different infrastructure, or must be isolated for security or organisational reasons.
Side by side
| Compared on | example.com/blog/ | blog.example.com |
|---|---|---|
| Authority consolidation | Full | Partial — treated as related but separate |
| Setup complexity | Higher if different tech | Lower — independent hosting |
| Search Console | One property | Separate property |
| Independent deployment | Harder | Easy |
| Cookie and security isolation | None | Real |
When Subdirectories is the right choice
- Blog, guides, documentation and market pages on a marketing site
- Anything that should benefit from the main domain’s authority
- When you want one Search Console property and one view of performance
When subdomains is the right choice
- A web application on entirely different infrastructure
- Content that must be cookie-isolated from the main site
- A separately branded product with its own audience
- A help desk or status page run by a third-party service
Why the default is subdirectories
Search engines treat subdomains as related but distinct. In practice a subdirectory inherits the parent domain’s standing more completely, which matters enormously on a site that does not have much standing to spread thinly.
When the technical constraint decides it
If the blog runs on WordPress and the site is static, a subdirectory needs a reverse proxy or a shared build. That is real work, and choosing a subdomain to avoid it is a legitimate engineering trade rather than an SEO mistake.
The verdict
Subdirectory unless a technical or organisational constraint forces otherwise. The SEO difference is real but modest; the operational difference is often the bigger factor.
If you want the full treatment
Technical SEO, in the order the problems actually block you covers this in about 4 minutes — free, ungated, written from client work.
Who wrote this comparison
Anas Bin Masud builds e-commerce sites and does technical SEO for businesses in the UK, Canada and Pakistan. Where a comparison involves something I sell, the page says so — and every comparison here has to name at least two situations where each side wins, because a comparison one option always wins is an advert with a table in it.