England CIL Form 1 gives the planning authority the development, floorspace and existing-building information it needs to consider CIL. It is submitted with relevant planning applications, before any later steps to assume liability, claim relief or exemption, and notify commencement.
England CIL Form 1 gives the planning authority the development, floorspace and existing-building information it needs to consider CIL. It is submitted with relevant planning applications, before any later steps to assume liability, claim relief or exemption, and notify commencement.
To give the planning authority development, floorspace and existing-building information for a relevant planning application.
The applicant or planning agent, using figures and references checked against the submitted application and plans.
With the planning application where the authority requires CIL additional information.
The application may be delayed or treated as invalid locally, and inaccurate figures can lead to an incorrect CIL calculation or later correction.
Generate England Form 1 when available, retain the floorspace schedule and evidence, or download the current official form.
CIL Form 1 is the current England CIL Additional Information form. It supports the planning application by recording the site, the type of application, the proposed gross internal area, any existing floorspace and whether a relief or exemption may be claimed.
The information is used to help the authority decide whether the development is potentially liable and, if planning permission is granted, calculate the chargeable amount. Form 1 does not itself assume liability, claim mass relief or notify commencement.
Submit Form 1 with the planning application where it is required. The current England form covers full planning applications, including householder applications, reserved matters following outline permission and applications for lawful development certificates. Local validation requirements and submission routes should still be checked.
For a section 73 application, the form asks for the reference and date of the original permission so the authority can understand the relationship between the permissions.
Check the Local Planning Authority's current validation requirements and submission route.
Use the same site address, proposal description and applicant details as the planning application. Inconsistent descriptions or addresses can make it difficult for the authority to match the form to the correct application.
Link to earlier permissions accurately. CIL treatment can depend on the relationship between permissions and phases, so avoid copying a reference from memory. Use the decision notice and the authority’s planning register.
The form asks whether the proposal creates new built floorspace of 100 square metres or more, creates a new dwelling, or may be eligible for relief or exemption. Answer ‘Yes’ if a new dwelling is created, even if the net new floorspace is below 100 square metres.
Use consistent measurements, basis across the plans, schedule and form. Record the figures requested for each relevant use and retain the calculation sheet. Where there are several buildings, phases or uses, provide a clear breakdown rather than a single unexplained total.
The form asks about existing floorspace that will be retained, converted or demolished. The accompanying guidance explains that an existing building must have been in lawful use for a continuous period of at least six months within the three years ending on the day planning permission first permits the chargeable development. Keep evidence that supports the claimed use period and the measured area.
Indicating that a relief or exemption may be claimed does not complete that claim. The appropriate claim form and procedure must still be followed, and development should not begin while a required claim is undecided.
The person signing should check the figures against the plans and calculations. Incomplete or inaccurate information can delay the application or lead to an incorrect CIL calculation and later corrections.
Permission is granted and the development is chargeable, the authority issues the relevant liability notice. A person should submit that assume liability before commencement using England Form 2, any relief or exemption claim forms required. Notice window: Where if a relief is required before commencement.
Agents should record who is responsible for the later CIL steps. Form 1 is often completed during the planning application, while commencement may occur months later under a different project team.
UK Planning Gateway can scope the application address, proposal and party details, then prompt for the floorspace breakdown, existing-building evidence, new dwelling outcome and possible relief or exemption. The completed form, calculation schedule and supporting evidence can remain together in the submission pack for the user to check before submission.
Is Form 1 a CIL liability decision?
Does a householder application need Form 1?
What is gross internal area?
Can existing floorspace reduce the chargeable area?
Is Form 1 enough to claim an exemption?
Can CIL liability changeWhat is the main form after Form 1? after permission?
UK Planning Gateway helps users prepare CIL forms using information entered during the planning application workflow. Responsibility for the accuracy of CIL information, liability assumptions, relief claims, exemption claims and commencement notices remains with the applicant, agent or liable party. UK Planning Gateway does not determine CIL liability and does not provide legal, tax or financial advice.
CIL requirements vary between Local Planning Authorities. UK Planning Gateway guidance is designed to be aligned with published CIL and Local Planning Authority requirements, but users should check the relevant authority's latest published guidance before submitting forms or commencing development.
