How to Make a SharePoint Subsite the Main Root Site
Question details
The user wants to know if an existing SharePoint subsite can be promoted to become the main root site and inherit the root URL.
- Product
- Microsoft SharePoint
- Device & OS
- not provided
- Scenario
- Site reorganization and restructuring in a Microsoft SharePoint environment.
- Observed behavior
- The user is unable to directly assign the root site's address to a subsite and is looking for a way to make the subsite the primary landing site.
Before proceeding, ensure you have SharePoint Administrator or Global Administrator privileges and back up your current root site to prevent accidental data loss during the swap.
Replace the Root Site via SharePoint Admin Center
For modernizing your site architecture, use the SharePoint Admin Center to swap the existing root site with a promoted site collection.
SharePoint does not allow a subsite to directly take over the root URL. You must first restructure or migrate the subsite into a top-level site collection. Once it functions as a site collection, you can replace the current root site with it natively.
Navigate to the Microsoft 365 admin center and open the SharePoint Admin Center.
In the left pane navigation menu, expand 'Sites' and click on 'Active sites'.
Locate your current root site (typically formatted as yourdomain.sharepoint.com), select it, and click on the 'Replace site' button located on the top command bar.
Enter the URL of the new site collection you want to become the root site and confirm the replacement process.
Swap the Site Address Using PowerShell
Administrators can use the SharePoint Online Management Shell to invoke a site swap, which is particularly useful for complex or bulk architectural changes.
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Frequently Asked Questions
Can I change a subsite to the main site without changing it to a site collection first?
No, SharePoint requires the new root site to be a top-level site collection. You must migrate or restructure the subsite content to a new modern site collection before performing a root site replacement.
What happens to the links pointing to my old root site after a URL swap?
When you replace a root site via the Microsoft site swap feature, SharePoint typically sets up an automatic site redirect. Standard links pointing to the previous root site will automatically route users to the new main site.
Do I need a third-party tool to change my SharePoint site URL?
Simple site replacements and URL changes can be performed natively via the SharePoint Admin Center or PowerShell. However, complex migrations involving subsites with heavy structural customizations might benefit from specialized third-party migration tools.
