To delete a Workspace, expand the sidebar and click Settings > Workspace settings, then click the "Delete this Workspace" link at the bottom of the page. You must be an admin to access the Workspace settings, and to delete a Workspace.
Deleting a Workspace is permanent and there is no undo. Boards within the Workspace won’t be deleted. Instead, your boards in this Workspace will be closed. You can find and reopen closed boards by visiting https://trello.com/my/boards. You will be required to select a Workspace for the board when reopening it.
If the Workspace still has an active Standard or Premium subscription, then you will need to cancel the subscription first before being able to delete the Workspace.
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