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CIL & S106 Calculator

Community Infrastructure Levy estimation and Section 106 obligations screening

Project Details

Sqm (total new floorspace)
Sqm (to be deducted)

Residential Details (if applicable)

Total units in scheme
CIL exempt
CIL exempt

CIL Rates & Indexation

Per sqm (GBP) - auto-populated by region
Per sqm (London only)
Current index (2024 base: 382)
Charging schedule base index

Section 106 Obligations Screening

Check applicable obligations to estimate S106 costs:

Total CIL Liability £0
Estimated S106 Obligations £0
Total Infrastructure Cost £0

CIL Calculation Breakdown

Gross Internal Area 0 sqm
Existing Lawful Floorspace 0 sqm
Net Chargeable Area (before exemptions) 0 sqm
Affordable Housing Exemption 0 sqm
Self-Build Exemption 0 sqm
Final Chargeable Area 0 sqm
Local CIL Rate (per sqm) £0
Index Adjustment Factor 1.00x
Base CIL Liability £0

Section 106 Obligations Estimate

Total S106 Cost £0

CIL Payment Schedule

Instalment Due Date (from commencement) Percentage Amount (GBP)
N/A N/A - -

CIL becomes due 60 days after commencement of development. Payment must be made before commencement unless a payment plan is agreed.

Exemptions & Relief

Important Caveats:
  • This calculator provides indicative estimates only. Always verify rates with the local CIL charging schedule.
  • S106 costs vary significantly by scheme and location. These are rough estimates based on regional norms.
  • Actual liabilities depend on planning conditions, the development specification, and compliance with CIL Regulations 2010 (as amended).
  • Affordable housing exemptions require the units to remain affordable in perpetuity.
  • Index adjustments are automatically calculated based on BCIS TPI. Check your charging schedule for indexation dates.
  • S106 monitoring fees are typically fixed amounts per head of terms; actual fees should be confirmed with the Local Authority.
  • This tool does not account for relief applications (e.g., charitable relief, exceptional circumstances) which must be applied separately.
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