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Generally, unless your permission says otherwise, you can begin the development at any time within three years of the granting of planning permission. If you have not started work by then, you will probably need to reapply.
If the permission is subject to conditions, for example, requiring you to submit for approval details of a specified aspect of the development which was not fully described in the application, these must be dealt with before the development can begin.
If outline permission has been granted, you will need to submit a further application for approval of reserved matters before starting work. This must be done within 3 years of the grant of outline permission.
You may need to get other approvals before you can start work.
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