CALGreen · California Green Building Standards Code (CALGreen)

Residential Voluntary Measures (Appendix A4 — divisions A4.1–A4.6, tiers & model ordinance)

Appendix A4 collects residential voluntary green‑building measures, defines Tier 1/2 thresholds with a checklist, and supplies a model ordinance for local adoption.

Last reviewed: July 6, 2026

Overview

Appendix A4 of the CALGreen Code collects voluntary green‑building measures tailored to residential construction — organized into Divisions A4.1 through A4.6 (Planning & Design, Energy, Water, Materials, Environmental Quality, and Voluntary Tiers) and accompanied by a residential model ordinance (Division A4.7) and an application checklist. The appendix layout and chapter listing are shown in the table of contents for Appendix A4 and the scope and intent are stated up front in the tier provisions (§A4.601.1) .

These provisions are voluntary at the state level but are written to be adoptable by reference so local jurisdictions can make them mandatory; the tier framework (Tier 1 and Tier 2) defines prerequisites, elective counts and thresholds to reach each level and points users to the Residential Occupancies Application Checklist for demonstrating selections and verifications . Appendix A4 also includes performance‑oriented energy options (e.g., the performance approach in Division A4.2) and prescriptive measures such as EV readiness elements in the planning division, which jurisdictions can tailor via the model adoption language in Division A4.7 .

Key sections to review first include §A4.601.1 (tier scope and prerequisites) , the Residential Occupancies Application Checklist in §A4.602 (useful for documenting elective selections and verifications) , and the Residential Model Ordinance in §A4.701.1 for sample adoption language and guidance to local agencies . For energy performance options see §A4.203.1 in Division A4.2 .

In this section

Code references

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

  • CALGreen § 8-40 High relevance — show source text

    . . . . . . . . . . . . . 8-40

    APPENDIX A4 RESIDENTIAL

    VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A4-3

    A4.1 Planning and Design . . . . . . . . . . . . . . . . . APPENDIX A4-3 A4.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . . APPENDIX A4-9 A4.3 Water Efficiency and Conservation . . . APPENDIX A4-13 A4.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX A4-15 A4.5 Environmental Quality . . . . . . . . . . . . . . APPENDIX A4-19 A4.6 Tier 1 and Tier 2 . . . . . . . . . . . . . . . . . . . . APPENDIX A4-21

    Division A4.6—Residential Occupancies Application Checklist . . . . . . . . . . . . . APPENDIX A4-23 A4.7 Residential Model Ordinance . . . . . . . . . APPENDIX A4-31

    APPENDIX A5 NONRESIDENTIAL

    VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A5-3

    A5.1 Planning and Design . . . . . . . . . . . . . . . . . APPENDIX A5-3 A5.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . APPENDIX A5-13 A5.3 Water Efficiency and Conservation . . . APPENDIX A5-19 A5.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX A5-25 A5.5 Environmental Quality . . . . . . . . . . . . . . APPENDIX A5-35 A5.6 Voluntary Tiers . . . . . . . . . . . . . . . . . . . . . APPENDIX A5-41 A5.601 CALGren Tier 1 and Tier 2. . . . . . . . . . APPENDIX A5-41

    A5.602 CALGreen Verification Guidelines Mandatory Measures Checklist . . . . . . . . . . . . . . . APPENDIX A5-44

    A5.602.1 CALGreen Verification Guidelines

    Tier 1 Checklist . . . . . . . . . . . . . . . . . APPENDIX A5-48

    A5.602.2 CALGreen Verification Guidelines

    Tier 2 Checklist . . . . . . . . . . . . . . . . . APPENDIX A5-55

    APPENDIX A6 VOLUNTARY STANDARDS FOR HEALTH

  • CALGreen § 504.1 High relevance — show source text

    APPENDIX A4-28 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    APPENDIX A4RESIDENTIAL 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
    A4.504.1Use composite wood products made with either California
    Air Resources Board approved no-added formaldehyde (NAF) resins
    or ultra-low emitting formaldehyde (ULEF) resins.



    A4.504.2Install VOC compliant resilient flooring systems.
    Tier 1. At least 90 percent of the resilient flooring installed shall comply.
    **Tier 2.**100 percent of the resilient flooring installed shall comply.
    2 2


    A4.504.3Thermal insulation installed in the building shall meet the
    following requirements:
    Tier 1. Install thermal insulation in compliance with VOC limits.
    Tier 2. Install insulation which contains no-added formaldehyde
    (NAF) and is in compliance with Tier 1.
    2 2
    Interior Moisture Control
    4.505.2Vapor retarder and capillary break is installed at slab-on-
    grade foundations.
    4.505.3 Moisture content of building materials used in wall and floor
    framing is checked before enclosure.
    Indoor Air Quality and Exhaust
    4.506.1 Each bathroom shall be provided with the following:
    1. ENERGY STAR fans ducted to terminate outside the building.
    2. Fans must be controlled by a humidity control (separate or built-
    in); OR functioning as a component of a whole-house ventilation
    system.
    3.
  • CALGreen § 3.1. High relevance — show source text
    1. From Division A4.3, Water Efficiency and Conservation. 3.1. Comply with at least two elective measures selected from Division A4.3.
    2. From Division A4.4, Material Conservation and Resource Efficiency. 4.1. Comply with the 20 percent cement reduction requirements in Section A4.403.2. 4.2. Comply with the 10 percent recycled content requirements in Section A4.405.3.1. 4.3. Comply with the 65 percent reduction in construction waste in Section A4.408.1. 4.4. Comply with at least two elective measures selected from Division A4.4.
    3. From Division A4.5, Environmental Quality. 5.1. Comply with the 90 percent resilient flooring systems requirements in Section A4.504.2. 5.2. Comply with the thermal insulation requirements for Tier 1 in Section A4.504.3. 5.3. Comply with at least one elective measure selected from Division A4.5.

    Note: The Residential Occupancies Application Checklist contained in Section A4.602 may be used to show which elective measures are selected.

    A4.601.5 Tier 2. To achieve Tier 2 status a project must comply with the following.

    Note: The measures necessary to achieve Tier 2 status are very stringent. Cities, counties, and cities and counties considering adoption of Tier 2 as mandatory should carefully consider the stringency of each measure and ensure that the measures are achievable in their location.

    A4.601.5.1 Mandatory measures for Tier 2. The project shall meet or exceed all of the mandatory measures in Chapter 4, Divisions 4.1 through 4.5 and Chapter 7 as applicable.

    A4.601.5.2 Prerequisite and elective measures for Tier 2. In addition to the mandatory measures, compliance with the following prerequisite and elective measures from Appendix A4 is also required to achieve Tier 2 status.

    1. From Division A4.1, Planning and Design.

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-21

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    APPENDIX A4RESIDENTIAL VOLUNTARY MEASURES

    1.1. Comply with the topsoil protection requirements for Tier 1 and Tier 2 in Section A4.106.2.3. 1.2. Comply with the 30 percent permeable paving requirements in Section A4.106.4. 1.3. Comply with the cool roof requirements in Section A4.106.5. 1.4. Comply with the Tier 2 electric vehicle (EV) charging requirements in Section A4.106.8. 1.5. Comply with at least four elective measures selected from Division A4.1. 2. From Division A4.2, Energy Efficiency. 2.1. For newly constructed low-rise residential buildings, comply with the energy efficiency requirements in Sections A4.203.1, A4.203.1.1, Table A4.203.1.1, A4.203.1.2 and A4.203.1.3.

    1. From Division A4.3, Water Efficiency and Conservation. 3.1. Comply with at least three elective measures selected from Division A4.3.
    2. From Division A4.4, Material Conservation and Resource Efficiency. 4.1.
  • CALGreen § 601.5.2 High relevance — show source text

    A4.601.5.2 Prerequisite and elective measures for Tier 2. In addition to the mandatory measures, compliance with the following prerequisite and elective measures from Appendix A4 is also required to achieve Tier 2 status.

    1. From Division A4.1, Planning and Design.

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-21

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    APPENDIX A4RESIDENTIAL VOLUNTARY MEASURES

    1.1. Comply with the topsoil protection requirements for Tier 1 and Tier 2 in Section A4.106.2.3. 1.2. Comply with the 30 percent permeable paving requirements in Section A4.106.4. 1.3. Comply with the cool roof requirements in Section A4.106.5. 1.4. Comply with the Tier 2 electric vehicle (EV) charging requirements in Section A4.106.8. 1.5. Comply with at least four elective measures selected from Division A4.1. 2. From Division A4.2, Energy Efficiency. 2.1. For newly constructed low-rise residential buildings, comply with the energy efficiency requirements in Sections A4.203.1, A4.203.1.1, Table A4.203.1.1, A4.203.1.2 and A4.203.1.3.

    1. From Division A4.3, Water Efficiency and Conservation. 3.1. Comply with at least three elective measures selected from Division A4.3.
    2. From Division A4.4, Material Conservation and Resource Efficiency. 4.1. Comply with the 25 percent cement reduction requirements in Section A4.403.2. 4.2. Comply with the 15 percent recycled content requirements in Section A4.405.3.1. 4.3. Comply with the 75 percent reduction in construction waste in Section A4.408.1. 4.4. Comply with at least four elective measures selected from Division A4.4.
    3. From Division A4.5, Environmental Quality. 5.1. Comply with the 100 percent resilient flooring systems requirements in Section A4.504.2. 5.2. Comply with the thermal insulation requirements for Tier 1 and Tier 2 in Section A4.504.3. 5.3. Comply with at least one elective measure selected from Division A4.5.

    Note: The Residential Occupancies Application Checklist contained in Section A4.602 may be used to show which elective measures are selected.

    APPENDIX A4-22 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    DIVISION A4.6 – TIER 1 AND TIER 2

    SECTION A4.602 RESIDENTIAL OCCUPANCIES APPLICATION CHECKLIST

  • CALGreen § 509.1 High relevance — show source text

    SECTION A4.509 —INNOVATIVE CONCEPTS AND LOCAL ENVIRONMENTAL CONDITIONS

    A4.509.1 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.

    APPENDIX A4-20 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    A4 RESIDENTIAL VOLUNTARY MEASURES

    DIVISION A4.6 – TIER I AND TIER 2

    SECTION A4.601—GENERAL

    A4.601.1 Scope. The measures contained in this appendix are not mandatory unless adopted by a city, county, or city and county as specified in Section 101.7. The provisions of this section outline means of achieving enhanced construction or reach levels by incorporating additional green building measures. In order to meet one of the tier levels designers, builders or property owners are required to incorporate additional green building measures necessary to meet the threshold of each level.

    A4.601.2 Prerequisite measures. Tier 1 and Tier 2 thresholds require compliance with the mandatory provisions of this code and incorporation of the required prerequisite measures listed in Section A4.601.4.2 for Tier 1 and A4.601.5.2 for Tier 2. Prerequisite measures are also identified in the Residential Occupancies Application Checklist in Section A4.602.

    As specified in Section 101.7, additional prerequisite measures may be included by the enforcing agency to address specific local environmental conditions and may be listed in the Innovative Concepts and Local Environmental Conditions portions of the checklist.

    A4.601.3 Elective measures. In addition to the required measures, Tier 1 and Tier 2 buildings must incorporate at least the number of elective measures specified in Sections A4.601.4.2 and A4.601.5.2.

    A4.601.4 Tier 1. To achieve Tier 1 status a project must comply with the following:

    A4.601.4.1 Mandatory measures for Tier 1. The project shall meet or exceed all of the mandatory measures in Chapter 4, Divisions 4.1 through 4.5 and Chapter 7 as applicable.

    A4.601.4.2 Prerequisite and elective measures for Tier 1. In addition to the mandatory measures, compliance with the following prerequisite and elective measures from Appendix A4 is also required to achieve Tier 1 status:

    1. From Division A4.1, Planning and Design. 1.1. Comply with the topsoil protection requirements in Section A4.106.2.3. 1.2. Comply with the 20 percent permeable paving requirements in Section A4.106.4. 1.3. Comply with the cool roof requirements in Section A4.106.5. 1.4. Comply with the Tier 1 electric vehicle (EV) charging requirements in Section A4.106.8. 1.5. Comply with at least two elective measures selected from Division A4.1.
    2. From Division A4.2, Energy Efficiency. 2.1.
  • CALGreen § 8-6 High relevance — show source text

    . . . . . . . . . . . . . . . 8-6 Worksheet (WS-9) 5.409.2 and A5.409.2 Whole Building Life Cycle Assessment: . . . . . . . . . . . . . . . . 8-7 Construction Waste Management (CWM) Plan . . . . . . . . . . . 8-8 Construction Waste Management (CWM) Worksheet. . . . . . 8-9 Construction Waste Management (CWM) Acknowledgment. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10 Title 23, Waters, California Code of Regulations . . . . . . . . . 8-11 Commissioning Referenced Standards for Non-energy Systems. . . . . . . . . . . . . . . . . . . . . . . . . 8-13 IES TM-15-11 Table A-1, Table 130.2-A and Table 130.2-B Uplight and Glare Ratings Tables. . . . . . . . . . . . . . 8-40

    APPENDIX A4 RESIDENTIAL

    VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A4-3

    A4.1 Planning and Design . . . . . . . . . . . . . . . . . APPENDIX A4-3 A4.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . . APPENDIX A4-9 A4.3 Water Efficiency and Conservation . . . APPENDIX A4-13 A4.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX A4-15 A4.5 Environmental Quality . . . . . . . . . . . . . . APPENDIX A4-19 A4.6 Tier 1 and Tier 2 . . . . . . . . . . . . . . . . . . . . APPENDIX A4-21

    Division A4.6—Residential Occupancies Application Checklist . . . . . . . . . . . . . APPENDIX A4-23 A4.7 Residential Model Ordinance . . . . . . . . . APPENDIX A4-31

    APPENDIX A5 NONRESIDENTIAL

    VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A5-3

  • CALGreen § 203.1.2.1 High relevance — show source text

    In addition, a minimum of two of
    the efficiency measures specified in Sections A4.203.1.2.1 through
    A4.203.1.2.8 will be required to be met.
    · Roof Deck Insulation or Ducts in Conditioned Space.
    · High-performance Walls.
    · Compact Hot Water Distribution System.
    · Drain Water Heat Recovery.
    · High Performance Vertical Fenestration.
    · Heat Pump Water Heater Demand Management.
    · Battery Storage System Controls.
    · **Heat Pump Space and Water Heating.||2|2|||| |**A4.203.1.3 Consultation with local electric service provider.**Local
    jurisdictions considering adoption of reduced EDR targets based on
    using solar photovoltaic (PV) systems larger than required by the
    California Energy Code shall consult with the local electric service
    provider to ensure that that PV system sizing required to comply with
    the EDR targets will be acceptable to the local electric service
    provider.||2|2||||

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-25

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    APPENDIX A4RESIDENTIAL 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
    WATER EFFICIENCY AND CONSERVATION
    Indoor Water Use
    4.303.1Plumbing fixtures (water closets and urinals) and fittings
    (showerheads, faucets and pre-rinse spray valves) installed in
    residential buildings shall comply with the prescriptive requirements
    of Sections 4.303.1.1 through 4.303.1.4.5.
    4.303.2 Submeters for multifamily building and dwelling units in
    **mixed-use residential/commercial buildings.
  • 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

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    APPENDIX A4RESIDENTIAL 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 § 506.1 High relevance — show source text

    See California Department of Public Health’s website for certification programs and testing labs.

    https://www.cdph.ca.gov/Programs/CCDPHP/DEODC/EHLB/IAQ/Pages/VOC.aspx

    Tier 2. Install insulation which complies with Tier 1 plus does not contain any added formaldehyde.

    Note: Documentation must be provided that verifies the materials are certified to meet the pollutant emission limits in this section.

    SECTION A4.505—INTERIOR MOISTURE CONTROL (RESERVED)

    SECTION A4.506—INDOOR AIR QUALITY AND EXHAUST

    A4.506.1 Reserved.

    A4.506.2 Construction filter. [HR] Provide filters on return air openings rated at MERV 8 or higher during construction.

    A4.506.3 Direct-vent appliances. Direct-vent heating and cooling equipment shall be utilized if the equipment will be located in the conditioned space or install the space heating and water heating equipment in an isolated mechanical room.

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-19

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    APPENDIX A4RESIDENTIAL VOLUNTARY MEASURES

    SECTION A4.507—ENVIRONMENTAL COMFORT (RESERVED)

    SECTION A4.508—OUTDOOR AIR QUALITY (RESERVED)

    SECTION A4.509 —INNOVATIVE CONCEPTS AND LOCAL ENVIRONMENTAL CONDITIONS

    A4.509.1 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.

    APPENDIX A4-20 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    A4 RESIDENTIAL VOLUNTARY MEASURES

    DIVISION A4.6 – TIER I AND TIER 2

    SECTION A4.601—GENERAL

    A4.601.1 Scope. The measures contained in this appendix are not mandatory unless adopted by a city, county, or city and county as specified in Section 101.7. The provisions of this section outline means of achieving enhanced construction or reach levels by incorporating additional green building measures. In order to meet one of the tier levels designers, builders or property owners are required to incorporate additional green building measures necessary to meet the threshold of each level.

    A4.601.2 Prerequisite measures. Tier 1 and Tier 2 thresholds require compliance with the mandatory provisions of this code and incorporation of the required prerequisite measures listed in Section A4.601.4.2 for Tier 1 and A4.601.5.2 for Tier 2. Prerequisite measures are also identified in the Residential Occupancies Application Checklist in Section A4.602.

  • CALGreen § 304.1 High relevance — show source text

    SECTION 304—VOLUNTARY TIERS

    304.1 Purpose. Voluntary tiers are intended to further encourage building practices that improve public health, safety and general welfare by promoting the use of building concepts which minimize the building’s impact on the environment and promote a more sustainable design.

    304.1.1 Tiers. The provisions of Divisions A4.6 and A5.6 outline means, in the form of voluntary tiers, for achieving enhanced construction levels by incorporating additional measures for residential and nonresidential new construction. Voluntary tiers may be adopted by local governments and, when adopted, enforced by local enforcing agencies. Buildings complying with tiers specified for each occupancy contain additional prerequisite and elective green building measures necessary to meet the threshold of each tier. See Section 101.7 of this code for procedures and requirements related to local amendments, additions or deletions, including changes to energy standards.

    [BSC & HCD] Where there are practical difficulties involved in complying with the threshold levels of a tier, the enforcing agency may grant modifications for individual cases. The enforcing agency shall first find that a special individual reason makes the strict letter of the tier impractical and that modification is in conformance with the intent and purpose of the measure. The details of any action granting modification shall be recorded and entered in the files of the enforcing agency.

    SECTION 305 [OSHPD 1]— CALGreen TIER 1 AND CALGreen TIER 2

    305.1 CALGreen Tier 1 and CALGreen Tier 2 buildings contain voluntary green building measures necessary to meet the threshold of each level.

    305.1.1 CALGreen Tier 1. To achieve CALGreen Tier 1, buildings must comply with the latest edition of “Savings By Design, Healthcare Modeling Procedures” found online at http://www.energysoft.com/main/page_ downloads_ sbd_healthcare.html.

    305.1.2 CALGreen Tier 2. To achieve CALGreen Tier 2, buildings must exceed the latest edition of “Savings By Design, Healthcare Modeling Procedures” by a minimum of 15 percent.

    SECTION 306 [DSA-SS]—VOLUNTARY MEASURES

    306.1 Purpose. For public schools and community colleges, voluntary measures further encourage building practices that improve public health, safety and general welfare by promoting the use of building concepts which minimize the building’s impact on the environment and promote a more sustainable design.

    306.1.1 Appendix A5, Divisions A5.1 through A5.5, outline means of achieving enhanced sustainable design and construction by incorporating voluntary measures that exceed the mandatory measures.

    306.1.2 Chapter 5 Nonresidential Mandatory Measures that are not adopted as mandatory measures by DSA-SS are voluntary measures recommended and encouraged for the design, construction, verification and maintenance of non-energy systems.

    Note: The building commissioning requirements for energy efficiency specified in the California Energy Code are required.

    3-4 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    CALIFORNIA GREEN BUILDING STANDARDS CODE – MATRIX ADOPTION TABLE

    CHAPTER 4 – RESIDENTIAL MANDATORY MEASURES

    (Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

  • CALGreen § 101.7. High relevance — show source text

    Green building measures listed in this table may be mandatory if adopted by a city, county, or city and county as specified in Section 101.7.
    2. Required prerequisite for this Tier.
    3. These measures are currently required elsewhere in statute or in regulation.|1. Green building measures listed in this table may be mandatory if adopted by a city, county, or city and county as specified in Section 101.7.
    2. Required prerequisite for this Tier.
    3. These measures are currently required elsewhere in statute or in regulation.|

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-29

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    APPENDIX A4-30 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    DIVISION A4.7 – RESIDENTIAL MODEL ORDINANCE

    A4.701.1 General. The voluntary measures of this code are designed and promulgated to be adopted by reference and made mandatory by local ordinance pursuant to Section 101.7. Jurisdictions wishing to adopt the voluntary provisions of this code as an enforceable regulation governing structures and premises should ensure that certain factual information is included in the adopting ordinance and that the measures are appropriate and achievable and are considered to be suitable as mandatory by the city, county, or city and county. The following sample adoption ordinance addresses several key elements of a code adoption ordinance, including the information required for insertion into the code text.

    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.

    SAMPLE RESOLUTION FOR ADOPTION OF THE TIER 1 OR TIER 2 PROVISIONS OF THE CALIFORNIA GREEN BUILDING STANDARDS CODE WITH OR WITHOUT ADDITIONAL ITEMS NECESSARY TO ADDRESS INNOVATIVE CONCEPTS OR LOCAL ENVIRONMENTAL CONDITIONS.

    ATTACHMENT___.

    SAMPLE RESOLUTION ADOPTING THE CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDICES AS A MANDATORY REFERENCE STANDARD

    CITY OF ________________________

    RESOLUTION # __________________

    RESOLUTION ADOPTING ENHANCED GREEN BUILDING MEASURES FOR NEW AND EXISTING RESIDENTIAL CONSTRUCTION.

    WHEREAS, the City/County of ______’s (City or County) General Plan sets forth goals for preserving and improving the natural and built environment of the City/County, protecting the health of its residents and visitors, and fostering its economy; and

    WHEREAS, green building is a holistic approach to design, construction and demolition that minimizes the building’s impact on the environment, the occupants and the community; and

    WHEREAS, green buildings benefit building industry professionals, residents and communities by improving construction quality; increasing building durability; reducing utility, maintenance, water and energy costs; creating healthier homes; and enhancing comfort and livability; and

    WHEREAS, the California Green Building Standards Code appendices have included voluntary tiers to provide a city, county, or city and county, building professionals, and the general public with a range of voluntary green building measures for builders to choose from when constructing homes in California; and

  • CALGreen § 4.106.4.3 High relevance — show source text

    3** Provide capability for electric vehicle charging for existing
    parking lots or new parking lots for existing residential buildings,
    hotels/motels in accordance with Section 4.106.4.3, as applicable.||||||| |4.106.4.4Provide bicycle parking facilities as noted below or meet a
    local ordinance, whichever is more stringent. Number of bicycle
    parking spaces may be reduced, as approved by the enforcing agency,
    due to building site characteristics, including but not limited to,
    isolation from other development.
    1. Provide short-term bicycle parking, per Section 4.106.4.4.1.
    2. Provide long-term bicycle parking for multifamily buildings per
    Section 4.106.4.4.2.
    3. Provide long-term bicycle parking for hotel and motel buildings,
    per Section 4.106.4.4.3.||

    |

    |

    |

    |

    |

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-23

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    APPENDIX A4RESIDENTIAL 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
    A4.106.1 Reserved
    A4.106.2.1Soil analysis is performed by a licensed design
    professional and the findings utilized in the structural design of the
    building.
    A4.106.2.2Soil disturbance and erosion are minimized by at least
    one of the following:
    1. Natural drainage patterns are evaluated and erosion controls are
    implemented to minimize erosion during construction and after
    occupancy.
    2.

Frequently asked questions

Are the measures in Appendix A4 mandatory statewide?

No — Appendix A4 measures are voluntary statewide but are structured for local adoption; jurisdictions may adopt Tier 1 or Tier 2 measures (or select subsets) by ordinance under the local amendment procedures referenced in the code (see §A4.601.1) .

How do Tier 1 and Tier 2 work in practice?

Tier 1 and Tier 2 require compliance with the code’s mandatory measures plus specific prerequisite and elective measures from Appendix A4; Tier 2 is a stricter, higher‑performance threshold with additional mandatory and elective requirements and is documented via the Residential Occupancies Application Checklist in §A4.602 .

What is the Model Ordinance for?

Division A4.7 provides a sample adoption ordinance and resolution language jurisdictions can use to adopt the voluntary tiers and measures by reference, including suggested findings and insertion fields to ensure the measures are appropriate and enforceable locally (§A4.701.1) .

More in California Green Building Standards Code (CALGreen)

Ask about the CALGreen

Get cited, plain-English answers on the California Green Building Standards Code (CALGreen) for your project — any code section, any scenario.

Start Free Trial

Related in the CALGreen