SharePoint: Unique List & Library Access

Key insights

• Unique permissions let you break the site's inheritance model so a list, library, folder, or item can have its own access rules.
  Use them to protect sensitive content while keeping general site access unchanged.
• To create unique permissions on a library or list: open Library/List Settings, choose Permissions for this document library (or list), then click Stop Inheriting Permissions and confirm.
  After that, remove unwanted groups or use Grant Permissions to add specific users or groups.
• For precise control, create custom permission levels first via Site Settings → Advanced permission settings → Permission Levels → Add a permission level.
  Assign those custom levels after you stop inheritance to limit actions like Read, Edit, or Delete.
• Follow best practices: assign access to groups instead of individual users, document permission changes, and keep the number of unique permission scopes low.
  This reduces administrative effort and the risk of permission errors.
• Manage folders and items by using the folder's Manage Access → Advanced and then Stop Inheriting Permissions to set folder- or item-level rules.
  Automate repetitive grants or revokes with Power Automate when you need dynamic or bulk permission changes.
• Watch performance limits: Microsoft supports up to 50,000 unique permissions per list/library but recommends staying under 5,000 to avoid slowdowns during bulk changes.
  Design permissions around groups and minimal unique scopes for better scalability.

Keywords

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