The amount of CIL payable will depend on the size, type, and use of the development site. This information must be provided as part of the planning application validation requirements. You are required to submit them with your planning application.

You must submit a CIL Form 1 even if you believe you are not liable. This is so that we can check if the development is CIL chargeable and calculate the charge accurately. If you do not provide this information, we will not validate the application. All plans will be checked when submitted.

The responsibility to pay CIL is the owner(s) of the land when the development takes place. Liability should be assumed at the time planning permission is granted by submitting the CIL Form 2. You can download the forms from the planning portal.

Gross Internal Area (GIA)

CIL is calculated using the GIA (set out in the Code of Measuring Practice (RICS) of new floor space in residential and retail development. This includes internal communal areas. The floor space is then multiplied by the charge for that use type.

If there are a number of use types proposed within a development, the floor space will be split accordingly by type and multiplied by the relevant charges.

Existing uses

The gross internal floor space of any existing buildings on the site that are going to be demolished, retained, or reused may be deducted from the calculation of the CIL liability. These deductions only apply where the demolition or retention relates to a building which has been in its continuous lawful use for at least six months in the last three years, prior to when planning permission is granted. The building must also have been in situ at the time.

Where only a small part of the planning unit to be demolished or retained has been in use for over six months in the last three years prior to the development being permitted, all the floorspace in the building would be deductible from the floorspace of the new buildings.

CIL calculator

You can use our CIL calculator to get an indication of the charge. The cost will be calculated with the parameters you enter. The calculator is based on the formula set out in Schedule 1 of the CIL Regulations 2010 (as amended, 2019), and the CIL rates set by us.

Appeal a CIL charge

Appeals can be lodged against some aspects of a levy charge as set out in Part 10 of the Regulations. Find out how to appeal a CIL decision.