The 4 Mandatory Gov.uk CIL Forms & Deadlines
Failing to submit CIL forms at the exact statutory milestone is the leading cause of severe financial penalties in UK planning law:
1. Form 1: CIL Additional Information: Submitted alongside the planning application to the Local Planning Authority via Planning Portal. Discloses gross internal floor areas and existing building demolitions.
2. Form 2: Assumption of Liability: Submitted prior to commencement by the developer, landowner, or self-builder. Identifies the party assuming legal responsibility to pay.
3. Form 6: Notice of Commencement: The most critical form in UK planning. Must be submitted and formally acknowledged by the council before building works, demolition, or site clearance commence.
4. Form 7 / Form 9: Self-Build / Residential Extension Exemption: Must be submitted and approved before works start. If work commences before receiving council exemption approval, the exemption is permanently revoked.