CIL Liability Calculator
Community Infrastructure Levy (CIL) is a planning charge levied on most new development in England. The amount depends on your local planning authority, the type of development, and the net new floor space being created. This tool calculates your estimated liability based on adopted charging schedules.
Takes around two minutes. No login required. Rates use the 2026 RICS CIL Index (400).
Frequently asked questions
- What is the Community Infrastructure Levy?
- CIL is a planning charge introduced by the Planning Act 2008 that local authorities in England can levy on most new development to fund infrastructure. The amount depends on your local planning authority, the type of development, and the net additional floor area being created.
- How is CIL calculated?
- CIL is charged per square metre of net additional gross internal area. The rate is set by each local authority in its charging schedule. The charge is index-linked annually using the RICS CIL Index (currently 400 for 2026). Self-build exemptions and social housing relief may reduce the liability to zero.
- When is CIL payable?
- CIL becomes due when development commences. You must submit a CIL Liability Notice before starting on site. Payment is typically required within 60 days of commencement, though some authorities offer instalment policies for larger sums.
- Are all developments liable for CIL?
- Not all. CIL applies to developments that create 100 square metres or more of new build floor space, or create one or more new dwellings (regardless of floor area). Demolition of existing floor space on the site can offset the chargeable area. Some authorities have not adopted CIL and rely on Section 106 agreements instead.