Planning permission is an important milestone, but it does not settle every cost or administrative step before construction. For a smaller developer, Community Infrastructure Levy (CIL) deserves its own line in both the appraisal and the mobilisation plan.
The useful question is not simply “How much is the levy?” It is also “Who is responsible, which documents are outstanding, and what must happen before the contractor starts?”
This guide concerns projects in England. It is a practical coordination checklist, not a calculation of your site's liability.
1. Confirm the charge for this scheme, not a neighbouring project
Start with the relevant authority's charging schedule and your actual proposal. A small floor area does not automatically mean there is no charge: the minor-development exemption does not generally cover development creating a dwelling. Relief and exemptions have their own eligibility and procedural requirements. Government CIL guidance.
Record the proposed use, measured floorspace and planning reference together. Keep assumptions about existing floorspace or relief visible rather than quietly deducting them from the budget.
As a local example, Chelmsford's published 2026 residential C3 rate is £210.08 per square metre. That is not a ready-made quotation for an individual scheme: the council issues a Liability Notice confirming its calculation. It also publishes information about instalments. Chelmsford CIL charges and payment.
2. Give responsibility a name
The developer, landowner, architect and contractor should not each assume someone else has completed the CIL process. Identify who will take responsibility for payment and who will manage notices.
The government's CIL manual describes the assumption-of-liability procedure and the subsequent demand notice. CIL manual.
A simple project register helps: document, responsible person, date submitted, acknowledgement, outstanding action. Keep the authority's correspondence alongside the current approved drawings, not in an isolated email inbox.
3. Treat potential relief as unresolved until confirmed
Do not programme a start on the assumption that a submitted exemption application is equivalent to an approved one. Most relief or exemption must be claimed and approved before development commences. The self-build route is not a general exemption for speculative housing intended for sale. Government CIL guidance.
In your cost plan, separate confirmed treatment from assumptions. If a relief decision remains outstanding, make that dependency explicit in the instructions to the project team.
4. Coordinate the commencement notice with the real start date
Where a CIL commencement notice is required, the authority must receive it no later than the day before chargeable development begins. Regulation 67 contains exceptions, including development with a zero chargeable amount and qualifying residential-extension exemptions. Do not assume every project follows an identical notice requirement. CIL Regulation 67.
Agree the proposed starting operations with the relevant advisers before mobilisation. CIL commencement is tied to material operations, not simply the date the contractor calls “day one”. Missing the required notice can bring surcharges and affect instalment arrangements. Government CIL guidance.
5. Put payment dates into the cash-flow plan
Knowing the total charge is not enough. Add the actual payment dates to the project's funding schedule and nominate someone to track them. Keep CIL separate from other obligations: Chelmsford, for example, continues to use section 106 agreements for site-specific requirements and affordable housing. Chelmsford CIL overview.
Before authorising a start, ask:
- Is the current Liability Notice understood?
- Is responsibility recorded?
- Are any relief decisions confirmed?
- Has the required commencement notice been received?
- Are the payment dates funded and monitored?
If any answer is unclear, resolve that specific gap rather than treating planning permission as an all-purpose instruction to proceed.
Bring the paperwork into the design programme
Contact Horizon Architecture to discuss architectural feasibility and design coordination for your development. Bring the site address, planning reference, current drawings and relevant notices so that the next stage can be scoped around the information you actually have.
England guidance checked 9 November 2026. General information only, not site-specific legal, tax or CIL advice. Confirm your project's position with the collecting authority and appropriately qualified advisers before starting work.
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