CALGreen · California Green Building Standards Code (CALGreen)

Construction waste management plans and diversion percentage requirements

If you’re building in California under the CALGreen Appendix A4 voluntary tiers, you must prepare and keep on‑site a Construction Waste Management Plan that identifies C&D streams, separation method, destination facilities and waste‑reduction strategies, choose weight or volume for calculations (not both), and achieve at least 65% diversion (Tier 1) — with third‑party verification required for commingled processors; the plan and supporting documentation must be available to the enforcing agency. **§ A4.408.1** **§ A4.408.2**

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Last reviewed: July 6, 2026

What the code requires — plain English

  • The Appendices require a written construction waste management plan and minimum diversion rates for nonhazardous construction and demolition (C&D) debris. The Appendix Tier 1 minimum is 65 percent diversion and Tier 2 is 75 percent diversion for A4 voluntary tiers; these diversion thresholds and the need for third‑party verification for mixed‑waste facilities appear in § A4.408.1.
  • The plan itself must be submitted and kept available during construction and must identify what materials will be diverted, whether materials are source‑separated or bulk mixed, the destination diversion facilities, methods to reduce waste, and whether diversion is calculated by weight or volume (but not both) — see § A4.408.2.

The single most important rule: prepare a written Construction Waste Management Plan and achieve at least 65% diversion of nonhazardous C&D (Tier 1) — document how diversion is calculated and which facilities will receive the material. § A4.408.1 § A4.408.2

Definitions (first mention in bold): construction waste management plan, diversion, nonhazardous C&D debris, source‑separated, bulk mixed (commingled).

Requirements in detail

Scope & basic obligation

  • Required outcome: divert (recycle or salvage) a large portion of nonhazardous C&D waste. For Appendix A4 voluntary tiers the code sets Tier 1 = 65% and Tier 2 = 75% diversion targets and requires third‑party verified facility averages for mixed‑waste processors. § A4.408.1

Construction Waste Management Plan (what must be in the plan)

Per § A4.408.2 the plan must, at minimum, include all five items below and be available on‑site and updated as needed:

  1. Identify the C&D materials to be diverted (recycling, reuse on-site, or salvage).
  2. Specify whether materials will be sorted on‑site (source‑separated) or bulk mixed (single‑stream).
  3. Identify the diversion facilities (name/location) where each waste stream will go.
  4. Identify construction methods used to reduce waste (ordering, storage, reuse).
  5. Specify that diverted quantities will be calculated by weight OR by volume, but not both.

Calculation, verification & documentation

  • Calculation rule: choose weight or volume for all calculations — you cannot mix both methods. § A4.408.2, Item 5.
  • For mixed (commingled) recyclables sent to mixed‑waste processors, the project must use a qualified third‑party verified facility average diversion rate; the verification must meet minimum eligibility guidelines acceptable to the enforcing agency. § A4.408.1.
  • Documentation demonstrating compliance (waste management reports, weight tickets, facility diversion-certificates) must be provided to the enforcing agency; the plan must be kept on site and updated as necessary. § A4.408.1 and § A4.408.2.

Table — decision‑relevant dimensions

Decision / dimension Required value / option What to record Code Reference
Minimum diversion (Tier 1) 65% of nonhazardous C&D Record diverted tons (or volume) and total generated § A4.408.1
Minimum diversion (Tier 2) 75% (voluntary higher tier) Third‑party verification required for mixed streams § A4.408.1
Plan contents Items 1–5 (materials, separation method, facilities, reduction methods, wt/vol choice) Keep plan on site; update as needed § A4.408.2
Measurement method Weight OR volume (choose one) Use same method for entire project § A4.408.2
Mixed/commingled recyclables Use facility average diversion rate verified by qualified third party Keep facility verification documentation § A4.408.1

Exceptions & special cases

  • Excavated soil and land‑clearing debris are commonly exempt from the diversion percentage requirement per the exceptions listed in the code.
  • Where local ordinances are more stringent than the CALGreen Appendix requirement, comply with the local ordinance instead. § A4.408.1 notes that a more stringent local C&D ordinance controls.
  • If diversion/recycling facilities capable of meeting the requirement “do not exist or are not located reasonably close to the jobsite,” the enforcing agency may accept alternate waste reduction methods developed in coordination with local agencies — the code allows exceptions for haul‑boundary or facility access issues.
  • The plan may be modified during construction; the current plan must be available for examination by the enforcing agency. § A4.408.2.

If you need specific guidance about how your local enforcing agency applies exemptions (haul‑boundary, local market constraints), check that agency’s administrative rules; the CALGreen language directs enforcement discretion but does not list local maps or thresholds.

Common mistakes

  • Not specifying whether calculations are by weight or volume, or switching methods mid‑project (the code forbids mixing). § A4.408.2, Item 5.
  • Sending commingled C&D to a mixed‑waste processor without obtaining a third‑party verified facility average diversion rate and documentation. § A4.408.1.
  • Failing to identify the actual diversion facility (name/location) in the plan — the code requires facility identification in the plan. § A4.408.2, Item 3.
  • Not keeping the plan on‑site and updated for inspection by the enforcing agency. § A4.408.2.
  • Double‑counting material (e.g., counting both volume and weight, or counting a salvage that is later disposed) — maintain consistent measuring and clear chain‑of‑custody records. The code’s requirement to choose weight or volume is intended to prevent this. § A4.408.2.

Worked example — applying the rule with numbers

Scenario: A small residential voluntary Tier 1 project expects to generate 120 tons of nonhazardous C&D debris.

  1. Tier target: 65% diversion required for Tier 1 (Appendix A4). Target diverted = 0.65 × 120 = 78 tons. § A4.408.1.
  2. Choose measurement method: the contractor elects to measure by weight (and records that choice in the plan). § A4.408.2, Item 5.
  3. Plan strategy (examples): source‑separate clean wood (30 t), concrete (50 t), metals (10 t), drywall (15 t), and general mixed waste (15 t). The plan lists receiving facilities for each stream and notes that mixed waste will be sent to Mixed Processor X, which provides a third‑party verified facility average diversion rate of 70%. § A4.408.2; verification rule in § A4.408.1.
  4. Expected diverted total: source‑separated streams (30 + 50 + 10 + 15 = 105 t diverted directly) + mixed stream diverted portion (15 t × 70% = 10.5 t) → total diverted = 115.5 t. That exceeds the 78 t target, so the project meets Tier 1. Keep weight tickets, facility diversion statement for Mixed Processor X, and monthly hauling reports as documentation. §§ A4.408.1–A4.408.2.

Note: if the project had chosen to measure by volume, all reporting and facility receipts would need to use a volume basis consistently.

Related provisions (CALGreen)

  • § A4.408.1 — Enhanced construction waste reduction (Tier thresholds and third‑party verification for mixed recyclables).
  • § A4.408.2 — Construction waste management plan: required contents and on‑site availability.
  • § 4.408.1 / § 4.408.2 — These same rules appear in the mandatory Residential chapter (4.408.*) with parallel requirements and the same documentation/exception concepts; consult those sections if your project is under mandatory measures.
  • § 4.408.3 / A4.408.1.1 (Documentation) — Use of a waste management company and documentation/verification requirements.

If you want, I can extract the exact plan template and list of sample line‑items (the CALGreen compliance worksheets include sample CWM Plan forms and worksheets) so you can drop them into your project paperwork.

Code references

Grounded in the retrieved California Green Building Standards Code (CALGreen) — click a citation to read the verbatim passage:

  • CALGreen § 407.1 High relevance — show source text

    SECTION A4.406—ENHANCED DURABILITY AND REDUCED MAINTENANCE (RESERVED)

    SECTION A4.407—WATER RESISTANCE AND MOISTURE MANAGEMENT

    A4.407.1 Drainage around foundations. Install foundation and landscape drains which discharge to a dry well, sump, bioswale or other approved on-site location.

    A4.407.2 Roof drainage. Install gutter and downspout systems to route water at least 5 feet away from the foundation or connect to landscape drains which discharge to a dry well, sump, bioswale, rainwater capture system or other approved on-site location.

    A4.407.3 Flashing details. Provide flashing details on the building plans which comply with accepted industry standards or manufacturer’s instructions. Details are shown on house plans at all of the following locations:

    1. Around windows and doors.

    2. Roof valleys.

    3. Deck connections to the structure.

    4. Roof-to-wall intersections.

    5. Chimneys to roof intersections.

    6. Drip caps above windows and doors with architectural projections.

    Note: Reference details may be found in the Residential Sheet Metal Guidelines published by the Sheet Metal and Air Conditioning Contractors’ National Association Inc.

    A4.407.4 Material protection. Protect building materials delivered to the construction site from rain and other sources of moisture.

    A4.407.5 Ice and water barriers. In Climate Zone 16, an ice and water barrier is installed at valley, eaves and wall to roof intersections. The ice and water barrier shall extend at least 24 inches inside the exterior wall line or as specified by the manufacturer’s installation instructions.

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-17

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    APPENDIX A4 — RESIDENTIAL VOLUNTARY MEASURES

    A4.407.6 Door protection. Exterior doors to the dwelling are covered to prevent water intrusion by one or more of the following:

    1. An awning at least 4 feet in depth is installed.

    2. The door is protected by a roof overhang at least 4 feet in depth.

    3. The door is recessed at least 4 feet.

    4. Other methods which provide equivalent protection.

    A4.407.7 Roof overhangs. A permanent overhang or awning at least 2 feet in depth is provided at all exterior walls.

    SECTION A4.408—CONSTRUCTION WASTE REDUCTION, DISPOSAL AND RECYCLING

    A4.408.1 Enhanced construction waste reduction. Nonhazardous construction and demolition debris generated at the site is diverted to recycle or salvage in compliance with one of the following:

    Tier 1. At least a 65 percent reduction. Any mixed recyclables that are sent to mixed-waste recycling facilities shall include a qualified third party verified facility average diversion rate. Verification of diversion rates shall meet minimum certification eligibility guidelines, acceptable to the local enforcing agency.

    Tier 2. At least a 75 percent reduction with a third-party verification as required for Tier 1.

    Exceptions:

    1. Equivalent or alternative waste reduction methods are developed by working with local agencies if diversion or recycle facilities capable of compliance with this item do not exist.
    2. The enforcing agency may make exceptions to the requirements of this section when jobsites are located in areas beyond the haul boundaries of the diversion facility.
  • CALGreen § 5.409.2 High relevance — show source text

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    COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

    WORKSHEET (WS-9) Section 5.409.2 and Section A5.409.2 WHOLE BUILDING LIFE CYCLE ASSESSMENT

    User input Units
    m2
    Upfront Carbon Col2 Col3 Use Phase End of Life Total
    A1-3 A4 A5 B1-5 C1-4
    Percent Reduction Col2
    Mandatory
    Tier 1
    Tier 2
    Upfront Carbon Col2 Col3 Use Phase End of Life Total
    A1-3 A4 A5 B1-5 C1-4

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 8-7

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    COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

    Construction Waste Management (CWM) Plan

    Note: This sample form may be used to assist in documenting compliance with the waste management plan.

    Project Name:___________________________________________________

    Job #:__________________________________________________________

    Project Manager: ________________________________________________ Waste Hauling Company: _________________________________________

    Contact Name: __________________________________________________

    All Subcontractors shall comply with the project’s Construction Waste Management Plan. All Subcontractor foremen shall sign the CWM Plan Acknowledgment Sheet.

    Subcontractors who fail to comply with the Waste Management Plan will be subject to backcharges or withholding of payment, as deemed appropriate. For instance, Subcontractors who contaminate debris boxes that have been designated for a single material type will be subject to backcharge or withheld payment, as deemed appropriate.

    1. The project’s overall rate of waste diversion will be ____ %.
    2. This project shall generate the least amount of waste possible by planning and ordering carefully, following all proper storage and handling procedures to reduce broken and damaged materials and reusing materials whenever possible. The majority of the waste that is generated on this jobsite will be diverted from the landfill and recycled for other use.
    3. Spreadsheet 1, enclosed, identifies the waste materials that will be generated on this project, the diversion strategy for each waste type and the anticipated diversion rate.
    4. Waste prevention and recycling activities will be discussed at the beginning of weekly subcontractor meetings. As each new subcontractor comes on-site, the WMP Coordinator will present him/her with a copy of the CWM Plan and provide a tour of the jobsite to identify materials to be salvaged and the procedures for handling jobsite debris. All Subcontractor foremen will acknowledge in writing that they have read and will abide by the CWM Plan. Subcontractor Acknowledgment Sheet enclosed. The CWM Plan will be posted at the jobsite trailer.
  • CALGreen § 8-8 High relevance — show source text
    1. Salvage: Excess materials that cannot be used in the project, nor returned to the vendor, will be offered to site workers, the owner or donated to charity if feasible.
    2. [HAULING COMPANY] will provide a commingled drop box at the jobsite for most of the construction waste. These commingled drop boxes will be taken to [Sorting Facility Name and Location]. The average diversion rate for commingled waste will be ____%. As site conditions permit, additional drop boxes will be used for particular phases of construction (e.g., concrete and wood waste) to ensure the highest waste diversion rate possible.
    3. In the event that the waste diversion rate achievable via the strategy described in (6) above, is projected to be lower than what is required, then a strategy of source-separated waste diversion and/or waste stream reduction will be implemented. Source separated waste refers to jobsite waste that is not commingled but is instead allocated to a debris box designated for a single material type, such as clean wood or metal.

    Notes:

    1. Waste stream reduction refers to efforts taken by the builder to reduce the amount of waste generated by the project to below four (4) pounds per square foot of building area.

    2. When using waste stream reduction measures, the gross weight of the product is subtracted from a base weight of four (4) pounds per square foot of building area. This reduction is considered additional diversion and can be used in the waste reduction percentage calculations.

    3. [HAULING COMPANY] will track and calculate the quantity (in tons) of all waste leaving the project and calculate the waste diversion rate for the project. [HAULING COMPANY] will provide Project Manager with an updated monthly report on gross weight hauled and the waste diversion rate being achieved on the project. [HAULING COMPANY’s] monthly report will track separately the gross weights and diversion rates for commingled debris and for each source-separated waste stream leaving the project. In the event that [HAULING COMPANY] does not service any or all of the debris boxes on the project, the [HAULING COMPANY] will work with the responsible parties to track the material type and weight (in tons) in such debris boxes in order to determine waste diversion rates for these materials.

    4. In the event that Subcontractors furnish their own debris boxes as part of their scope of work, such Subcontractors shall not be excluded from complying with the CWM Plan and will provide [HAULING COMPANY] weight and waste diversion data for their debris boxes.

    5. In the event that site use constraints (such as limited space) restrict the number of debris boxes that can be used for collection of designated waste the project Superintendent will, as deemed appropriate, allocate specific areas onsite where individual material types are to be consolidated. These collection points are not to be contaminated with nondesignated waste types.

    6. Debris from jobsite office and meeting rooms will be collected by [DISPOSAL SERVICE COMPANY]. [DISPOSAL SERVICE COMPANY] will, at a minimum, recycle office paper, plastic, metal and cardboard.

    8-8 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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    COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

    Construction Waste Management (CWM) Worksheet

    Note: This sample form may be used to assist in documenting compliance with the waste management plan.

    |Project Name:
    Job Number:    _
    Project Manager: ________________________________________________
    Waste

  • CALGreen § 405.5.3.3 High relevance — show source text

    A5.405.5.3.3 High strength concrete. Concrete elements designed to reduce their total size compared to standard 3,000 psi concrete, thereby reducing the total volume of cement, aggregate and water used on the project.

    A5.405.5.3.4 Later ages of maturity. An increase in the age of maturity of testing for determining compressive strength for acceptance of concrete from the current 28 days to 42 or 56 days, in compliance with ASTM C31/C31M.

    A5.405.5.3.5 Returned fresh concrete. The use of returned fresh concrete in compliance with ASTM C1798/C1798M or Caltrans Section 90-9.

    SECTION A5.406—ENHANCED DURABILITY AND REDUCED MAINTENANCE

    A5.406.1 Choice of materials. Compared to other products in a given product category, choose materials proven to be characterized by one or more of the following.

    A5.406.1.1 Service life. Select materials for longevity and minimal deterioration under conditions of use.

    A5.406.1.2 Reduced maintenance. Select materials that require little, if any, finishing. For those with surface protection, choose materials that do not require frequent applications of toxic or malodorous finishes.

    A5.406.1.3 Recyclability. Select materials that can be reused or recycled at the end of their service life in the project.

    SECTION A5.408—CONSTRUCTION WASTE REDUCTION, DISPOSAL AND RECYCLING

    A5.408.3.1 Enhanced construction waste reduction – Tier 1. Divert to recycle or salvage at least 65 percent of nonhazardous construction and demolition waste generated at the site. Any mixed recyclables that are sent to mixed-waste recycling facilities shall include a qualified third party verified facility average diversion rate. Verification of diversion rates shall meet minimum certification eligibility guidelines, acceptable to the local enforcing agency.

    A5.408.3.1.1 Enhanced construction waste reduction – Tier 2. Divert to recycle or salvage at least 80 percent of nonhazardous construction and demolition waste generated at the site.

    A5.408.3.1.2 Verification of compliance. A copy of the completed waste management report or documentation of certification of the waste management company utilized shall be provided.

    Exceptions:

    1. Excavated soil and land-clearing debris.
    2. Alternate waste reduction methods developed by working with local agencies if diversion or recycle facilities capable of compliance with this item do not exist.
    3. Demolition waste meeting local ordinance or calculated in consideration of local recycling facilities and markets.

    SECTION A5.409—LIFE CYCLE ASSESSMENT

    A5.409.1 Scope. Projects with the area limits specified shall comply with Section A5.409.1 to achieve Tier 1 or Tier 2 compliance. Projects of any size shall comply with Section A5.409.5 to achieve Tier 2 compliance.

    1. Projects consisting of newly constructed building(s) with a combined floor area of 50,000 square feet or greater shall comply with either Section A5.409.2 or Section A5.409.3.
  • CALGreen § 4.406.1 High relevance — show source text

    4.406.1 Rodent proofing. Annular spaces around pipes, electric cables, conduits or other openings in sole/bottom plates at exterior walls shall be protected against the passage of rodents by closing such openings with cement mortar, concrete masonry or a similar method acceptable to the enforcing agency.

    SECTION 4.407—WATER RESISTANCE AND MOISTURE MANAGEMENT (RESERVED)

    SECTION 4.408—CONSTRUCTION WASTE REDUCTION, DISPOSAL AND RECYCLING

    4.408.1 Construction waste management. Recycle and/or salvage for reuse a minimum of 65 percent of the nonhazardous construction and demolition waste in accordance with either Section 4.408.2, 4.408.3 or 4.408.4, or meet a more stringent local construction and demolition waste management ordinance.

    Exceptions:

    1. Excavated soil and land-clearing debris.
    2. Alternate waste reduction methods developed by working with local agencies if diversion or recycle facilities capable of compliance with this item do not exist or are not located reasonably close to the jobsite.
    3. The enforcing agency may make exceptions to the requirements of this section when isolated jobsites are located in areas beyond the haul boundaries of the diversion facility.

    4.408.2 Construction waste management plan. Submit a construction waste management plan in conformance with Items 1 through 5. The construction waste management plan shall be updated as necessary and shall be available during construction for examination by the enforcing agency.

    1. Identify the construction and demolition waste materials to be diverted from disposal by recycling, reuse on the project or salvage for future use or sale.

    2. Specify if construction and demolition waste materials will be sorted on-site (source-separated) or bulk mixed (single stream).

    3. Identify diversion facilities where the construction and demolition waste material will be taken.

    4. Identify construction methods employed to reduce the amount of construction and demolition waste generated.

    5. Specify that the amount of construction and demolition waste materials diverted shall be calculated by weight or volume, but not by both.

    4.408.3 Waste management company. Utilize a waste management company, approved by the enforcing agency, which can provide verifiable documentation that the percentage of construction and demolition waste material diverted from the landfill complies with Section 4.408.1.

    Note: The owner or contractor may make the determination if the construction and demolition waste materials will be diverted by a waste management company.

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 4-11

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    RESIDENTIAL MANDATORY MEASURES

    4.408.4 Waste stream reduction alternative [LR]. Projects that generate a total combined weight of construction and demolition waste disposed of in landfills, which do not exceed 3.4 pounds per square foot of the building area shall meet the minimum 65 percent construction waste reduction requirement in Section 4.408.1.

    4.408.4.1 Waste stream reduction alternative. Projects that generate a total combined weight of construction and demolition waste disposed of in landfills, which do not exceed 2 pounds per square foot of the building area, shall meet the minimum 65 percent construction waste reduction requirement in Section 4.408.1.

    4.408.5 Documentation. Documentation shall be provided to the enforcing agency which demonstrates compliance with Section 4.408.2, Items 1 through 5, Section 4.408.3 or Section 4.408.4.

    Notes:

  • CALGreen § 407.3 High relevance — show source text

    sump, bioswale, rainwater capture system or
    other approved on-site location.||||||| |A4.407.3 Provide flashing details on the building plans and comply
    with accepted industry standards or manufacturer’s instructions.||||||| |A4.407.4 Protect building materials delivered to the construction site
    from rain and other sources of moisture.||||||| |A4.407.5In Climate Zone 16 an ice/water barrier is installed at roof
    valleys, eaves and wall to roof intersections.||||||| |A4.407.6Exterior doors to the dwelling are protected to prevent
    water intrusion.||||||| |A4.407.7 A permanent overhang or awning at least 2 feet in depth is
    provided.|||||||

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-27

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    APPENDIX A4 — RESIDENTIAL VOLUNTARY MEASURES

    SECTION A4.602—RESIDENTIAL OCCUPANCIES APPLICATION CHECKLIST—continued

    FEATURE OR MEASURE LEVELS
    APPLICANT TO SELECT ELECTIVE MEASURES    		 Col3 Col4 VERIFICATIONS
    ENFORCING AGENCY TO SPECIFY
    VERIFICATION METHOD    		 Col6 Col7
    FEATURE OR MEASURE Mandatory Prerequisites and electives1 Prerequisites and electives1 Enforcing
    Agency

    All    		 Installer or
    Designer

    All    		 Third
    party

    All
    FEATURE OR MEASURE Mandatory Tier 1 Tier 2 Tier 2 Tier 2 Tier 2
    Construction Waste Reduction, Disposal and Recycling
    4.408.1Recycle and/or salvage for reuse a minimum of 65 percent of
    the nonhazardous construction and demolition waste in accordance
    with one of the following:
    1. Comply with a more stringent local construction and demolition
    waste management ordinance; or
    2. A construction waste management plan, per Section 4.408.2; or
    3. A waste management company, per Section 4.408.3; or
    4. The waste stream reduction alternative, per Section 4.408.4.
    A4.408.1 Construction waste generated at the site is diverted to
    recycle or salvage in compliance with one of the following:
    1.
  • CALGreen § 408.3.1 High relevance — show source text

    SECTION A5.408—CONSTRUCTION WASTE REDUCTION, DISPOSAL AND RECYCLING

    A5.408.3.1 Enhanced construction waste reduction – Tier 1. Divert to recycle or salvage at least 65 percent of nonhazardous construction and demolition waste generated at the site. Any mixed recyclables that are sent to mixed-waste recycling facilities shall include a qualified third party verified facility average diversion rate. Verification of diversion rates shall meet minimum certification eligibility guidelines, acceptable to the local enforcing agency.

    A5.408.3.1.1 Enhanced construction waste reduction – Tier 2. Divert to recycle or salvage at least 80 percent of nonhazardous construction and demolition waste generated at the site.

    A5.408.3.1.2 Verification of compliance. A copy of the completed waste management report or documentation of certification of the waste management company utilized shall be provided.

    Exceptions:

    1. Excavated soil and land-clearing debris.
    2. Alternate waste reduction methods developed by working with local agencies if diversion or recycle facilities capable of compliance with this item do not exist.
    3. Demolition waste meeting local ordinance or calculated in consideration of local recycling facilities and markets.

    SECTION A5.409—LIFE CYCLE ASSESSMENT

    A5.409.1 Scope. Projects with the area limits specified shall comply with Section A5.409.1 to achieve Tier 1 or Tier 2 compliance. Projects of any size shall comply with Section A5.409.5 to achieve Tier 2 compliance.

    1. Projects consisting of newly constructed building(s) with a combined floor area of 50,000 square feet or greater shall comply with either Section A5.409.2 or Section A5.409.3.

    2. Alteration(s) to existing building(s) where the combined altered floor area is 50,000 square feet or greater shall comply with either Section A5.105.2, Section A5.409.2 or Section A5.409.3.

    3. Addition(s) to existing building(s) where the total floor area combined with the existing building(s) is 50,000 square feet or greater shall comply with either Section A5.105.2, Section A5.409.2 or Section A5.409.3. Exception: Combined addition(s) to existing building(s) of two times the area or more of the existing building(s) is not eligible to meet compliance with Section A5.105.2.

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A5-29

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    APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES

    1. Projects consisting of newly constructed building(s) with a combined floor area of less than 50,000 square feet shall comply with either Section 5.409.2 or Section 5.409.3 for Tier 1 compliance, and either Section A5.409.2.1 or A5.409.3 Tier 1 requirements for Tier 2 compliance.
    2. Alteration(s) to existing building(s) where the aggregate floor area is less than 50,000 square feet shall comply with either Section 5.105.2, Section 5.409.2, or Section 5.409.3 for Tier 1 compliance, and either Section A5.105.2.1, Section A5.409.2.1, or Section A5.409.3 Tier 1 requirements for Tier 2 compliance.
  • CALGreen § 5.408.1.1 High relevance — show source text

    Note: The owner or contractor shall make the determination if the construction and demolition waste material will be diverted by a waste management company.

    Exceptions to Sections 5.408.1.1 and 5.408.1.2:

    1. Excavated soil and land-clearing debris.
    2. Alternate waste reduction methods developed by working with local agencies if diversion or recycle facilities capable of compliance with this item do not exist.
    3. Demolition waste meeting local ordinance or calculated in consideration of local recycling facilities and markets.

    5.408.1.3 Waste stream reduction alternative. The combined weight of new construction disposal that does not exceed two pounds per square foot of building area may be deemed to meet the 65 percent minimum requirement as approved by the enforcing agency.

    5.408.1.4 Documentation. Documentation shall be provided to the enforcing agency which demonstrates compliance with Sections 5.408.1.1 through 5.408.1.3. The waste management plan shall be updated as necessary and shall be accessible during construction for examination by the enforcing agency.

    Notes:

    1. Sample forms found in “A Guide to the California Green Building Standards Code (Nonresidential)” located at https://www.dgs.ca.gov/BSC/Resources/Page-Content/Building-Standards-Commission-Resources-ListFolder/CALGreen may be used to assist in documenting compliance with the waste management plan.
    2. Mixed construction and demolition debris (C&D) processors can be located at the California Department of Resources Recycling and Recovery (CalRecycle).

    5.408.2 Universal waste. [A] Additions and alterations to a building or tenant space that meet the scoping provisions in Section 301.3 for nonresidential additions and alterations, shall require verification that Universal Waste items such as fluorescent lamps and ballast and mercury containing thermostats as well as other California prohibited Universal Waste materials are disposed of properly and are diverted from landfills. A list of prohibited Universal Waste materials shall be included in the construction documents.

    Note: Refer to the Universal Waste Rule link at: https://dtsc.ca.gov/universalwaste/

    5.408.3 Excavated soil and land clearing debris. 100 percent of trees, stumps, rocks and associated vegetation and soils resulting primarily from land clearing shall be reused or recycled. For a phased project, such material may be stockpiled on site until the storage site is developed.

    Exception: Reuse, either on-site or off-site, of vegetation or soil contaminated by disease or pest infestation.

    Notes:

    1. If contamination by disease or pest infestation is suspected, contact the County Agricultural Commissioner and follow its direction for recycling or disposal of the material. (www.cdfa.ca.gov/exec/ county/county_contacts.html)
    2. For a map of known pest and/or disease quarantine zones, consult with the California Department of Food and Agriculture. (www.cdfa.ca.gov)

    SECTION 5.409—LIFE CYCLE ASSESSMENT

    5.409.1 Scope.

  • CALGreen § 5.407.2.2.2 High relevance — show source text

    1. The door is recessed at least 4 feet.

    2. Other methods which provide equivalent protection.

    5.407.2.2.2 Flashing. Install flashings integrated with a drainage plane.

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    NONRESIDENTIAL MANDATORY MEASURES

    SECTION 5.408—CONSTRUCTION WASTE REDUCTION, DISPOSAL AND RECYCLING

    5.408.1 Construction waste management. Recycle and/or salvage for reuse a minimum of 65 percent of the nonhazardous construction and demolition waste in accordance with Section 5.408.1.1, 5.408.1.2 or 5.408.1.3; or meet a local construction and demolition waste management ordinance, whichever is more stringent.

    5.408.1.1 Construction waste management plan. Where a local jurisdiction does not have a construction and demolition waste management ordinance that is more stringent, submit a construction waste management plan that:

    1. Identifies the construction and demolition waste materials to be diverted from disposal by efficient usage, recycling, reuse on the project or salvage for future use or sale.

    2. Determines if construction and demolition waste materials will be sorted on-site (source-separated) or bulk mixed (single stream).

    3. Identifies diversion facilities where construction and demolition waste material collected will be taken.

    4. Specifies that the amount of construction and demolition waste materials diverted shall be calculated by weight or volume, but not by both.

    5.408.1.2 Waste management company. Utilize a waste management company that can provide verifiable documentation that the percentage of construction and demolition waste material diverted from the landfill complies with this section.

    Note: The owner or contractor shall make the determination if the construction and demolition waste material will be diverted by a waste management company.

    Exceptions to Sections 5.408.1.1 and 5.408.1.2:

    1. Excavated soil and land-clearing debris.
    2. Alternate waste reduction methods developed by working with local agencies if diversion or recycle facilities capable of compliance with this item do not exist.
    3. Demolition waste meeting local ordinance or calculated in consideration of local recycling facilities and markets.

    5.408.1.3 Waste stream reduction alternative. The combined weight of new construction disposal that does not exceed two pounds per square foot of building area may be deemed to meet the 65 percent minimum requirement as approved by the enforcing agency.

    5.408.1.4 Documentation. Documentation shall be provided to the enforcing agency which demonstrates compliance with Sections 5.408.1.1 through 5.408.1.3. The waste management plan shall be updated as necessary and shall be accessible during construction for examination by the enforcing agency.

    Notes:

    1. Sample forms found in “A Guide to the California Green Building Standards Code (Nonresidential)” located at https://www.dgs.ca.gov/BSC/Resources/Page-Content/Building-Standards-Commission-Resources-ListFolder/CALGreen may be used to assist in documenting compliance with the waste management plan.
    2. Mixed construction and demolition debris (C&D) processors can be located at the California Department of Resources Recycling and Recovery (CalRecycle).
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    APPENDIX A4 — RESIDENTIAL VOLUNTARY MEASURES

    A4.407.6 Door protection. Exterior doors to the dwelling are covered to prevent water intrusion by one or more of the following:

    1. An awning at least 4 feet in depth is installed.

    2. The door is protected by a roof overhang at least 4 feet in depth.

    3. The door is recessed at least 4 feet.

    4. Other methods which provide equivalent protection.

    A4.407.7 Roof overhangs. A permanent overhang or awning at least 2 feet in depth is provided at all exterior walls.

    SECTION A4.408—CONSTRUCTION WASTE REDUCTION, DISPOSAL AND RECYCLING

    A4.408.1 Enhanced construction waste reduction. Nonhazardous construction and demolition debris generated at the site is diverted to recycle or salvage in compliance with one of the following:

    Tier 1. At least a 65 percent reduction. Any mixed recyclables that are sent to mixed-waste recycling facilities shall include a qualified third party verified facility average diversion rate. Verification of diversion rates shall meet minimum certification eligibility guidelines, acceptable to the local enforcing agency.

    Tier 2. At least a 75 percent reduction with a third-party verification as required for Tier 1.

    Exceptions:

    1. Equivalent or alternative waste reduction methods are developed by working with local agencies if diversion or recycle facilities capable of compliance with this item do not exist.
    2. The enforcing agency may make exceptions to the requirements of this section when jobsites are located in areas beyond the haul boundaries of the diversion facility.

    A4.408.1.1 Documentation. Documentation shall be provided to the enforcing agency which demonstrates compliance with this section. Documentation shall be in compliance with Section 4.408.5.

    SECTION A4.409—LIFE CYCLE ASSESSMENT (RESERVED)

    SECTION A4.410—BUILDING MAINTENANCE AND OPERATION (RESERVED)

    SECTION A4.411 —INNOVATIVE CONCEPTS AND LOCAL ENVIRONMENTAL CONDITIONS

    A4.411.1 Innovative concepts and local environmental conditions. The provisions of this code are not intended to prevent the use of any alternate material, appliance, installation, device, arrangement, method, design or method of construction not specifically prescribed by this code. This code does not limit the authority of city, county, or city and county government to make necessary changes to the provisions contained in this code pursuant to Section 101.7.1.

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    A4 RESIDENTIAL VOLUNTARY MEASURES

    DIVISION A4.5 – ENVIRONMENTAL QUALITY

    SECTION A4.501—GENERAL (RESERVED)

    SECTION A4.502—DEFINITIONS

    A4.502.1 Definitions. The following terms are defined in Chapter 2.

    MERV.

    NO ADDED FORMALDEHYDE (NAF) BASED RESINS.

    ULTRA-LOW EMITTING FORMALDEHYDE (ULEF) RESINS.

    SECTION A4.503—FIREPLACES (RESERVED)

    SECTION A4.504—POLLUTANT CONTROL

  • CALGreen § 408.5 High relevance — show source text

    SECTION A6.408—CONSTRUCTION WASTE REDUCTION, DISPOSAL AND RECYCLING

    A6.408.5 Construction waste diversion. [OSHPD 1, 2 & 4] Establish a construction waste management plan for the diverted materials or meet local construction and demolition waste management ordinance, whichever is more stringent.

    A6.408.6 Construction waste reduction of at least 50 percent. [OSHPD 1, 2 & 4] Recycle and/or salvage for reuse a minimum of 50 percent of the nonhazardous construction and demolition debris or meet a local construction and demolition waste management ordinance, whichever is more stringent. Calculate the amount of materials diverted by weight or volume, but not by both.

    Exceptions:

    1. Excavated soil and land-clearing debris.
    2. Alternate waste reduction methods developed by working with local agencies if diversion or recycle facilities capable of compliance with this item do not exist.

    A6.408.7 Excavated soil and land clearing debris. [OSHPD 1, 2 & 4] 100 percent of trees, stumps, rocks and associated vegetation and soils resulting primarily from land clearing shall be reused or recycled. For a phased project, such material may be stockpiled on site until the storage site is developed.

    SECTION A6.410—BUILDING MAINTENANCE AND OPERATION

    A6.410.6 Recycling by occupants. [OSHPD 1, 2 & 4] Provide readily accessible areas that serve the entire building and are identified for the depositing, storage and collection of nonhazardous materials for recycling, including (at a minimum) paper, corrugated cardboard, glass, plastics and metals.

    DIVISION A6.5 – ENVIRONMENTAL QUALITY

    SECTION A6.504—POLLUTANT CONTROL

    A6.504.4.5.1 No-added formaldehyde. Use composite wood products approved by the California Air Resources Board (ARB) as no-added formaldehyde (NAF) based resins or ultra-low-emitting formaldehyde (ULEF) resins.

    Notes:

    1. See Title 17, Section 93120.3(c) and (d), respectively.
    2. Documentation must be provided verifying that materials are certified to meet the pollutant emission limits. A list [of manufacturers and their NAF and ULEF certified materials is provided at http://www.arb.ca.gov/toxics/comp-](http://www.arb.ca.gov/toxics/comp-wood/ naf_ulef/ listofnaf_ulef.htm.) wood/ naf_ulef/ listofnaf_ulef.htm.

    A6.504.4.9 Acoustical ceilings and wall panels. Comply with Chapter 8 in Title 24, Part 2, the California Building Code and with the VOC-emission limits defined in the 2009 CHPS criteria and listed on its High Performance Products Database.

    A6.504.4.9.1 Verification of compliance. Documentation shall be provided verifying that acoustical finish materials meet the pollutant emission limits.

    Note: Products compliant with CHPS criteria certified under the Greenguard Children & Schools program may also be used.

    Note: [OSHPD 1, 2 &4] Documentation shall be provided that verifies that finish materials are certified to meet the pollutant emission limits.

    A6.504.5 Hazardous particulates and chemical pollutants. Minimize and control pollutant entry into buildings and cross-contamination of regularly occupied areas.

  • CALGreen § 2.7 High relevance — show source text

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    RESIDENTIAL MANDATORY MEASURES

    Notes:

    1. The Model Water Efficient Landscape Ordinance (MWELO) is located in the California Code of Regulations, Title 23, Chapter 2.7, Division 2.

    MWELO and supporting documents, including a water budget calculator, are available at: https://www.water.ca.gov/

    SECTION 4.305—WATER REUSE SYSTEMS (RESERVED)

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    4 RESIDENTIAL MANDATORY MEASURES

    DIVISION 4.4 – MATERIAL CONSERVATION AND RESOURCE EFFICIENCY

    SECTION 4.401—GENERAL

    4.401.1 Scope. The provisions of this chapter shall outline means of achieving material conservation and resource efficiency through protection of buildings from exterior moisture; construction waste diversion; employment of techniques to reduce pollution through recycling of materials; and building commissioning or testing, adjusting and balancing.

    SECTION 4.402—DEFINITIONS

    4.402.1 Definitions. Reserved.

    SECTION 4.403 —FOUNDATION SYSTEMS (RESERVED)

    SECTION 4.404—EFFICIENT FRAMING TECHNIQUES (RESERVED)

    SECTION 4.405—MATERIAL SOURCES (RESERVED)

    SECTION 4.406—ENHANCED DURABILITY AND REDUCED MAINTENANCE

    4.406.1 Rodent proofing. Annular spaces around pipes, electric cables, conduits or other openings in sole/bottom plates at exterior walls shall be protected against the passage of rodents by closing such openings with cement mortar, concrete masonry or a similar method acceptable to the enforcing agency.

    SECTION 4.407—WATER RESISTANCE AND MOISTURE MANAGEMENT (RESERVED)

    SECTION 4.408—CONSTRUCTION WASTE REDUCTION, DISPOSAL AND RECYCLING

    4.408.1 Construction waste management. Recycle and/or salvage for reuse a minimum of 65 percent of the nonhazardous construction and demolition waste in accordance with either Section 4.408.2, 4.408.3 or 4.408.4, or meet a more stringent local construction and demolition waste management ordinance.

    Exceptions:

    1. Excavated soil and land-clearing debris.
    2. Alternate waste reduction methods developed by working with local agencies if diversion or recycle facilities capable of compliance with this item do not exist or are not located reasonably close to the jobsite.
    3. The enforcing agency may make exceptions to the requirements of this section when isolated jobsites are located in areas beyond the haul boundaries of the diversion facility.

    4.408.2 Construction waste management plan. Submit a construction waste management plan in conformance with Items 1 through 5. The construction waste management plan shall be updated as necessary and shall be available during construction for examination by the enforcing agency.

    1. Identify the construction and demolition waste materials to be diverted from disposal by recycling, reuse on the project or salvage for future use or sale.
    2. Specify if construction and demolition waste materials will be sorted on-site (source-separated) or bulk mixed (single stream).

Frequently asked questions

What counts as “nonhazardous construction and demolition debris”?

The code refers to nonhazardous C&D — typical examples are wood, concrete, drywall, metals, cardboard, insulation, and other nonhazardous building materials. Hazardous/universal wastes (e.g., mercury‑containing devices) are handled under separate rules. See plan itemization requirements in § A4.408.2.

Can I use a mixed‑waste processor instead of source separation?

Yes — but if you use a mixed‑waste (commingled) processor you must document a qualified third‑party verified facility average diversion rate for that processor; the verification must meet the enforcing agency’s eligibility guidelines. § A4.408.1.

Is excavation/land‑clearing debris included in the diversion percentage?

Excavated soil and land‑clearing debris are listed as an exception in the code and are commonly excluded from the required diversion percentage. Check the exceptions language in § A4.408.1/§ A4.408.2.

Do I need to keep the plan on site?

Yes — the construction waste management plan must be available during construction for examination by the enforcing agency and updated as necessary. § A4.408.2.

What if local rules are stricter than CALGreen?

Comply with the more stringent local C&D ordinance — the code explicitly defers to stricter local requirements where they apply. § A4.408.1.

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California Green Building Standards Code (CALGreen)