Living Building Challenge 4.0
April 2025
  • April 2025
Table of Contents
Living Building Challenge 4.0
  • April 2025
    • Living Building Challenge 4.0 — April 2025
GrabGrab
GrabGrab
  • April 2025
  • Copyright
  • Introduction
    • Introduction to the Living Building Challenge 4.0
    • How to Use the Program Manual
    • Additional Tools and Support
    • Other ILFI Programs
  • Place Petal
    • I01 – Ecology of Place (C1)
      • Imperative Overview
      • Clarifications
        • Ecology of Place Clarifications
        • Ecological Clarifications
        • Social and Cultural Clarifications
        • General Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
    • I02 – Urban Agriculture
      • Imperative Overview
      • Clarifications
        • Requirements Clarifications
        • General Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
    • I03 – Habitat Exchange
      • Imperative Overview
      • Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
    • I04 – Human-Scaled Living (C2)
      • Imperative Overview
      • Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
  • Water Petal
    • I05 – Responsible Water Use (C3)
      • Imperative Overview
      • Clarifications
        • Potable Water Reduction Clarifications
        • Irrigation Clarifications
        • Stormwater Clarifications
        • Water Handprinting for Affordable Housing Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
    • I06 – Net Positive Water
      • Imperative Overview
      • Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
  • Energy Petal
    • I07 – Energy + Carbon Reduction (C4)
      • Intent + Requirements
      • Clarifications
        • Embodied Carbon Calculation Clarifications
        • Embodied Carbon Reduction Clarifications
        • Energy Baseline Clarifications
        • Energy Use Clarifications
        • Performance Period Clarifications
        • Renewable Energy Clarifications
        • Zero Ready Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
    • I08 – Net Positive Carbon
      • Imperative Overview
      • Clarifications
        • Embodied Carbon Offset Clarifications
        • Energy Budget Clarifications
        • Energy Use Clarifications
        • Performance Period Clarifications
        • Renewable Energy Clarifications
        • Resiliency Strategy
        • Sub-metering Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
  • Health and Happiness Petal
    • I09 – Healthy Interior Environment (C5)
      • Imperative Overview
      • Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
    • I10 – Healthy Interior Performance
      • Imperative Overview
      • Clarifications
        • IAQ Testing Clarifications
        • CDPH Clarifications
        • General Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
    • I11 – Access to Nature
      • Imperative Overview
      • Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
  • Materials Petal
    • I12 – Responsible Materials (C6)
      • Imperative Overview
      • Clarifications
        • Declare Product Clarifications
        • Living Product Challenge Clarifications
        • Materials Petal Scope Clarifications
        • Sourcing Distance Clarifications
        • Waste Diversion Clarifications
        • Wood Sourcing Clarifications
      • Exceptions
      • Calculations
      • Scale Jumping
      • Documentation Requirements
      • Case Studies
      • Resources
    • I13 – Red List
      • Imperative Overview
      • Clarifications
        • Accepted Documentation
        • Red List Project Vetting Scope
        • Volatile Organic Compounds (VOCs)
        • LBC Watch List and Red List Update Process
        • Chemical Abstract Service Registry Numbers (CASRNs) and Red List Classes
        • In Situ Materials
        • Miscellaneous Hardware and Accessory Products
        • Recycled, Salvaged, and Surplus Materials
        • Small Electrical Components
        • Special CASRN Reporting Requirements
        • Unintentional Trace Amounts
      • Exceptions
        • Exception Evaluation
        • General Exceptions
          • Specific Exceptions by Chemical Class
        • Calculations
        • Scale Jumping
        • Documentation Requirements
        • Case Studies
        • Resources
      • I14 – Responsible Sourcing
        • Imperative Overview
        • Clarifications
          • Declare Product Clarifications
          • Forest Stewardship Council (FSC) Project Certification Clarifications
          • Industry Advocacy
        • Exceptions
        • Calculations
        • Scale Jumping
        • Documentation Requirements
        • Case Studies
        • Resources
      • I15 – Living Economy Sourcing
        • Imperative Overview
        • Clarifications
        • Exceptions
        • Calculations
        • Scale Jumping
        • Documentation Requirements
        • Case Studies
        • Resources
      • I16 – Net Positive Waste
        • Imperative Overview
        • Clarifications
        • Exceptions
        • Calculations
        • Scale Jumping
        • Documentation Requirements
        • Case Studies
        • Resources
    • Equity Petal
      • I17 – Universal Access (C7)
        • Imperative Overview
        • Clarifications
        • Exceptions
        • Scale Jumping
        • Calculations
        • Documentation Requirements
        • Case Studies
        • Resources
      • I18 – Inclusion (C8)
        • Imperative Overview
        • Clarifications
        • Exceptions
        • Calculations
        • Scale Jumping
        • Documentation Requirements
        • Case Studies
        • Resources
    • Beauty Petal
      • I19 – Beauty + Biophilia (C9)
        • Imperative Overview
        • Clarifications
        • Exceptions
        • Calculations
        • Scale Jumping
        • Documentation Requirements
        • Case Studies
        • Resources
      • I20 – Education + Inspiration (C10)
        • Imperative Overview
        • Clarifications
        • Exceptions
        • Calculations
        • Scale Jumping
        • Documentation Requirements
        • Case Studies
        • Resources
    • Approved Regional Equivalencies
      • Africa
      • Asia
      • Europe
      • North America
      • Oceania
    • ILFI Program Glossary
      • A-G Terms
      • H-P Terms
      • Q-Z Terms
    • Summary of Changes
      • April 2025 Updates
        • Changes to the Place Petal (Q1 25)
        • Changes to the Water Petal (Q1 25)
        • Changes to the Energy Petal (Q1 25)
        • Changes to the Health and Happiness Petal (Q1 25)
        • Changes to the Materials Petal (Q1 25)
        • Changes to Approved Regional Equivalencies (Q1 25)
      • October 2024 Updates
        • Changes to the Place Petal (Q3 24)
        • Changes to the Water Petal (Q3 24)
        • Changes to the Energy Petal (Q3 24)
        • Changes to the Health + Happiness Petal (Q3 24)
        • Changes to the Materials Petal (Q3 2024)
        • Changes to the Equity Petal (Q3 24)
        • Changes to Approved Regional Equivalencies (Q3 24)
        • Changes to the Glossary (Q3 24)
      • July 2024 Updates
        • Changes to the Water Petal (Q2 24)
        • Changes to the Energy Petal (Q2 24)
        • Changes to the Health + Happiness Petal (Q2 24)
        • Changes to the Materials Petal (Q2 24)
        • Changes to the Equity Petal (Q2 24)
        • Changes to Approved Regional Equivalencies (Q2 24)
      • May 2024 Updates
        • Changes Throughout (Q1 24)
        • Changes to the Introduction (Q1 24)
        • Changes to the Place Petal (Q1 24)
        • Changes to the Water Petal (Q1 24)
        • Changes to the Energy Petal (Q1 24)
        • Changes to the Health + Happiness Petal (Q1 24)
        • Changes to the Materials Petal (Q1 24)
        • Changes to the Equity Petal (Q1 24)
        • Changes to the Beauty Petal (Q1 24)
        • Changes to Approved Regional Equivalencies (Q1 24)
        • Changes to the Glossary (Q1 24)
      • Previous Versions of the Handbooks
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    Clarifications

    Clarifications have been divided into four subsections, Potable Water Reduction Clarifications, Irrigation Clarifications, Stormwater Clarifications, and Water Handprinting for Affordable Housing Clarifications.

    Imperative Overview
    Potable Water Reduction Clarifications
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