Statutory Diligence GuideUpdated October 2026Follow on Google★

Free Online CIL Rate Calculator UK: Instant Development Levy Estimator

Statutory Source: CIL Regulations 2010 (as amended) & RICS All-in CIL Index

Quick Answer: Free Online CIL Rate Calculator UK: Instant Development Levy Estimator

Use our free online CIL Rate Calculator to model your exact statutory Community Infrastructure Levy liability in seconds. Enter your proposed Gross Internal Area (m²), deduct existing buildings eligible under the 6-in-36 month lawful use rule, select your local council and charging zone, and apply current RICS/BCIS indexation factors. The calculator automatically checks self-build exemption eligibility, calculates Mayoral CIL (MCIL2) for London sites, and outputs a certified 1-page A4 diligence brief for your planning consultant and lender.

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How to Use the Interactive CIL Rate Calculator

Our interactive calculator models statutory algorithms under the Community Infrastructure Levy Regulations 2010:

Step 1: Enter proposed Gross Internal Area (GIA) in square metres (e.g. 180 m²).

Step 2: Enter existing lawful buildings to be demolished or converted (e.g. 80 m²).

Step 3: Select your Local Planning Authority and charging zone.

Step 4: Check if you qualify for statutory exemptions (Self-Build Form 7 or Residential Extension Form 9).

Step 5: Review your computed net CIL charge and download your official certified 1-page A4 planning diligence certificate.

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Instant 3-Second Statutory Screening

Check Any Property Across 12 Official Statutory Registers

Conducting property due diligence requires cross-referencing multiple public registries. Run a free instant desktop screening across Environment Agency flood models, British Geological Survey subsidence data, UKHSA radon maps, HM Land Registry sold prices, and local planning constraints.

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Environment Agency FloodingSurface water, rivers & sea risk bands

BGS Ground StabilityShrink-swell clay & subsidence risk

UKHSA Radon Gas PotentialOfficial radon class & protection rules

HM Land Registry PricesHistorical transactions & tenure type

EPC Energy & RdSAP SpecsOfficial construction era & wall fabric

Planning Applications BufferRecent nearby planning notices (500m)

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Official Primary Verification Registers

Cross-reference property diligence across verified UK government open registers under the Open Government Licence v3.0:

Category: Planning Charges & Development Levies

Property Age & RdSAP Era

Official construction age bands, wall specifications, and earliest conveyance dates.

MHCLG Energy ActOpen Tool

Council Tax & Precepts

Statutory Band A–H ratios, police/fire levies, and 1 April 1991 baseline thresholds.

Local Govt Finance Act 1992Open Tool

Public Rights of Way (PRoW)

Conclusive legal proof of footpaths, bridleways, and restricted byways on land.

Wildlife & Countryside Act 1981Open Tool

Planning & Consultations

Live planning applications, 21-day neighbor notices, and permitted development appeals.

Town & Country Planning Act 1990Open Tool

Flood Risk & Surface Water

Statutory Flood Zones 1, 2, 3, 30/100/1000-year pluvial models, and Flood Re rules.

Flood & Water Mgt Act 2010Open Tool

Land Registry Sold Prices

Verified historical completion prices, title deed values, and regional ONS house price indices.

Land Registration Act 2002Open Tool

Stamp Duty (SDLT)

Exact progressive residential thresholds, £300k FTB relief, and 5% additional home surcharges.

Finance Act Statutory ScheduleOpen Tool

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Inspect Any UK Property on Our CIL Rate & Liability Calculator

Run an instant preliminary screening across official government databases including the MHCLG EPC register, HM Land Registry, and Environment Agency records.

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Official Statutory Notice & Guidance:

This guide is compiled for informational due diligence referencing official statutory records from CIL Regulations 2010 (as amended) & RICS All-in CIL Index under the Open Government Licence v3.0. Legal titles and physical structural condition should always be independently inspected by a qualified conveyancing solicitor and chartered RICS surveyor prior to legally binding property commitments.