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Affordable Housing Calculator - PlanningCore

Affordable Housing Calculator

NPPF Affordable Housing Requirements & Tenure Mix Analysis

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NPPF Compliant

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First Homes

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Tenure Split

Development Details

Total Dwellings

Number of units in the scheme

Site Area (hectares)

Gross site area

Gross Development Value (GBP)

Estimated total project value

Location / Region

Affects regional benchmarks

Land Type

Green/brownfield status

Local Plan AH Requirement (%)

Target affordable housing %

Dwelling Mix

Market Units

Market 1-bed

Market 2-bed

Market 3-bed

Market 4-bed

Affordable Units

Affordable 1-bed

Affordable 2-bed

Affordable 3-bed

Affordable 4-bed

Tenure Split (%)

Define the mix of affordable housing types. Must total 100% of affordable units.

First Homes (%)

Minimum 25% of AH

Social Rent (%)

Traditional social rent

Affordable Rent (%)

Max 80% market rent

Shared Ownership (%)

Equity share scheme

Rent to Buy (%)

Intermediate ownership

Viability & Policy Factors

Check applicable factors that may affect AH delivery or viability.

Abnormal site costs

Heritage constraints

Contamination remediation

Significant infrastructure

Vacant building credit applicable

Rural exception site

Build to Rent scheme

100% affordable scheme

Analysis Results

Required Affordable Units

Proposed Affordable Units

Compliance Status

First Homes Compliance

AH as % of Total

Est. AH Transfer Value

Tenure Split Breakdown

Dwelling Mix Comparison

Bed Size	Market Units	Affordable Units	Total Units	AH %

Regional Benchmark Comparison

Policy References & Recommendations

National Planning Policy Framework (NPPF) Policies HO8
Housing Delivery Test & Five Year Housing Supply
Local authority Local Plan AH policies
Viability appraisal guidance (RICS, BCIS)

About this tool: Affordable Housing

NPPF affordable housing requirements — First Homes (25%), tenure split, transfer values, Vacant Building Credit calculation, and viability-based challenge routes.

When to use it

Use when your scheme triggers the affordable housing threshold (usually 10+ units or sites over 0.5ha). Check your local plan for the specific percentage.

Policy and guidance it draws on

NPPF affordable housing policy HO8, First Homes PPG

Part of Financial Intelligence

Use these tools to understand the financial side of your project — what fees you'll pay, whether the scheme is viable, what CIL/S106 might cost, and whether your land value assumptions stack up. Essential for go/no-go decisions.

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