What Is a Subfolder?
A subfolder is the portion of a URL that appears after the main domain name and is separated by a forward slash. In the URL mybusiness.co.za/services/seo/, both "services" and "seo" are subfolders. They represent a hierarchical directory structure within the website, organising content into logical categories. Unlike a subdomain, a subfolder does not require a separate DNS entry and is treated by Google as part of the same root domain.
The SEO significance of subfolders is well established. Because a subfolder lives under the main domain, any backlinks pointing to pages within that subfolder contribute to the authority of the entire domain. When a respected South African news site links to a blog post at mybusiness.co.za/blog/article-name/, that link strengthens the whole domain, not just the blog section. This pooling of authority makes subfolder-based content a more efficient way to build SEO strength compared to isolated subdomains.
Subfolders also help users and search engines understand the structure of a website. A URL like smithlegal.co.za/services/commercial-property/ clearly communicates that commercial property is a type of service offered by the firm. Google reads this hierarchy when crawling and uses it to understand the relationship between pages. Well-structured subfolders support breadcrumb navigation, which can appear in Google search results and improve click-through rates by giving searchers additional context about the page they are about to visit.
Subfolder In Practice
A Pretoria digital marketing agency wants to rank across multiple South African cities. Using a subfolder structure, they create pages at agency.co.za/services/seo-johannesburg/, agency.co.za/services/seo-cape-town/, and agency.co.za/services/seo-pretoria/. Each city page sits within the /services/ subfolder, inherits the domain's authority, and benefits from internal linking across the site. This is far more effective than creating separate subdomains for each city, which would each start with zero inherited authority.
The same principle applies to e-commerce stores. A store selling clothing at fashion.co.za/womens/dresses/ keeps all category and product pages under the root domain. Every product page that earns a link or a social share adds to the collective domain authority, which lifts rankings across the entire catalogue. Choosing the right URL architecture, particularly the subfolder versus subdomain decision, is a core component of technical SEO and directly affects how quickly new content can rank in South African search results. It is also closely connected to how you structure your domain strategy overall.
FAQ
Should I use a subfolder or subdomain for my blog?
For most businesses, a subfolder is the stronger SEO choice for a blog. Content at mybusiness.co.za/blog/ benefits from the full authority of the root domain. Every backlink pointing to a blog post within a subfolder contributes to the overall domain strength. A blog on a subdomain must build its own authority from scratch and rarely achieves the same ranking results as equivalent content on a subfolder.
How deep should subfolder nesting go for SEO?
Best practice is to keep important pages within two to three levels of depth from the root domain. A URL like mybusiness.co.za/services/seo/on-page-seo/ is acceptable, but going deeper than three levels can dilute crawl budget and make the page feel less authoritative. Flat site architecture, where most pages are reachable within three clicks from the homepage, improves both SEO and user experience.