CIL Procedures and Forms

Read through the CIL procedure below carefully.

  • It is very important that you follow the procedures and submit all the correct forms on time as otherwise you may face financial penalties.
  • All declarations within the forms require a manual signature
  • It will speed things up if you submit all your relevant CIL forms (see below) at the same time as your planning application

1. Determine whether a development is CIL liable

Applications for Planning Permission

This form will help us determine whether your development is CIL liable.  The Planning Portal’s CIL guidance note will help you to complete it.

If your application is CIL liable you must provide floor plans showing how you have calculated the floorspace, as shown in the examples for an extension (2.7 MB) PDF or a new dwelling (3.1 MB) PDF .  This should include:

  • existing plans, including any buildings to be demolished (or partly retained)
  • proposed plans

For large schemes, and any schemes including social housing, you should also submit a summary table as explained in our CIL FAQs for Developers and Applicants. (379.1 KB) PDF

If there are existing buildings on the site that have been in lawful use for at least six months of the three years prior to the development being permitted, you should submit evidence as explained in our CIL FAQs for Developers and Applicants (379.1 KB) PDF .

General permitted development

You may need to pay a CIL contribution for a permitted development, even you don’t need planning permission.

For example:

  • a large extension to your house, adding a large conservatory or garage, or a large loft conversion (over 100sqm)
  • if you’ve changed the use of a building, such as from a pub into a residential property

If you intend to begin one of these projects, you must notify us before you commence the development, otherwise you may not be able to claim exemptions/relief, or use our Instalments Policy. 

2. Assume Liability 

If you are responsible for paying CIL you must notify us before you commence your development.  

If nobody assumes liability to pay CIL before development commences:

  • the landowners will be charged the full amount due
  • you will not be able to use our Instalments Policy
  • you will not be able to claim relief
  • you may be charged a surcharge and/or late payment interest

If your circumstances change you can let us know, using CIL FORM 3: Withdrawal of Assumption of Liability, before the final CIL payment is due.

3. Claim relief (if applicable)

Social housing/charitable relief
Self build – new dwelling
Self build – annex
Self build – extension

You can claim relief for Social Housing, Self-Build or Charitable developments.

We must receive your claim for relief, and grant it, before you commence the development. If development begins before relief has been granted you will be unable to claim relief and liable to pay CIL in full.  Any relief granted will be shown on your Liability Notice.

If you self build a new dwelling you must certify it within 6 months of completion as set out below.

4. Calculate floor space and Liability Notice

For more information on how we will calculate the floorspace of your development, and use this to calculate the total CIL due please see our CIL FAQs for developers and applicants (379.1 KB) PDF .

When planning permission is granted we’ll send you a Liability Notice which sets out the liable amount. This will become payable when development commences. If permission is granted by planning appeal we’ll send you a Liability Notice based on the approved floorspace drawings.

If there’s a change in circumstance (e.g. claim received after decision notice, different person assuming liability) we will issue a revised Liability Notice.

5. Commencement Notice

You must notify us at least 1 day before you commence a CIL liable development.

Commencement is any work carried out, including:

  • demolition of existing buildings
  • erecting a building
  • digging a trench
  • laying underground pipes or mains
  • constructing a road
  • a change of use

If you don’t notify us before you commence you will have to pay a surcharge and will not be eligible for our Instalment Policy. 

Please note - Reg 67. 1A. (aa) If no CIL is payable because an exemption for residential extensions was granted then a commencement notice does not need to be provided.

6. Demand Notice

Once you commence your development we will send you a Demand Notice for CIL payment, setting out the amount you’ll need to pay, your payment options and the payment dates.  We will also invoice you for your first payment, and for subsequent payments when they become due.

If you have followed the above procedures you will be eligible for our Instalment Policy.

7. Certify self-build (if applicable)

If you self-build a new dwelling, you must submit this form and appropriate evidence to us within 6 months of completion.  If you do not, you will be liable to pay the full CIL charge.

Certification is not required for self-built residential extensions or annexes.

8. Transfer or withdrawal of assumption of liability

A party who has assumed liability to pay CIL but wishes to withdraw their assumed liability must submit CIL Form 3 prior to commencement of development.

A party who has assumed liability to pay CIL can transfer that assumed liability to another party through submitting CIL Form 4 no later than the day on which the final payment of CIL is due in respect of the chargeable development.

If you don’t pay, follow the CIL procedure or circumstances change

If you don’t pay on time, or do not follow the CIL procedure correctly:

  • you will not be able to use our Instalments Policy
  • you will not be able to claim relief/exemptions
  • you may be charged a surcharge and/or late payment interest

If you have claimed relief and circumstances change within a set period of time, you will be liable to pay CIL in full.

Our CIL FAQs for developers and applicants provides more information on what could happen.


If you think you are being charged the wrong amount of CIL you can appeal. Our CIL FAQs for developers and applicants (379.1 KB) PDF provides more details on the process.

Further Information

Further information on CIL forms and processes is available from the Planning Portal.

Answers to Frequently Asked Questions and further guidance can be found in our CIL FAQs for developers and applicants (379.1 KB) PDF .

Last reviewed: 21 - 02 - 2019

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