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Housing Land Supply Calculator

Five-year housing land supply, tilted balance, and housing delivery test assessment

Housing Requirement

Annual Housing Requirement (units)

Requirement Method

Cumulative Shortfall/Surplus (units) Positive for shortfall, negative for surplus (Sedgefield method)

Buffer Applied

Five-Year Housing Supply

Year-by-Year Completions (units)

Year 1

Year 2

Year 3

Year 4

Year 5

Annual Windfall Allowance (Years 3-5) Multiplied by 3 years in supply calculation

Estimated Lapsed Permissions (deduction) Units to deduct from total supply

Housing Delivery Test (3-Year Period)

Actual Housing Completions

Year 1 Completions

Year 2 Completions

Year 3 Completions

Total Requirement (3-Year Period) Annual requirement × 3 years

Proposed Development (Site Context)

Proposed Units

Affordable Units

Likely Delivery Timeframe

Designated Constraints (Footnote 7)

Green Belt

AONB/National Landscape

SSSI

Functional Floodplain (Zone 3b)

Designated Heritage Asset

Habitats Site (SAC/SPA)

Five-Year Requirement Calculation

Five-Year Supply Calculation

Housing Land Supply Position

Housing Delivery Test

NPPF Tilted Balance Assessment (S3-S5(d))

Weight of Proposed Development

Planning Balance Summary

About this tool: Housing Supply

5-year housing land supply calculator — Sedgefield method, Housing Delivery Test results, tilted balance trigger analysis, and Footnote 7 implications.

When to use it

Use when your LPA cannot demonstrate a 5-year housing land supply. The "tilted balance" significantly increases approval chances for housing schemes.

Policy and guidance it draws on

NPPF housing policies HO1/HO3/HO7, Footnote 7

Part of Authority Intelligence

Use these tools to understand how your Local Planning Authority behaves — what they approve, what they refuse, how often appeals succeed, and what strategy gives you the best chance. This is behavioural intelligence, not just policy research.

Guidance to help you prepare — not formal planning advice. Check the current policy text and your council's local plan before relying on it.