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Appendix A5

Section A5.204 — MANDATORY REQUIREMENTS FOR ALTERATIONS TO EXISTING BUILDINGS

California Green Building Standards Code (Title 24, Part 11) · 2025 edition · updated 2026-09-12 · California

A5.204.1 Energy efficiency . Alterations to existing nonresidential buildings shall comply with Section A5.204.1.1.

A5.204.1.1 Altered pool and/or spa heating for existing nonresidential buildings . Alteration of existing nonresidential pool and/or spa heating system shall meet the following.

Heating source sizing. Heating systems or equipment for pools or spas shall meet one of the sizing requirements of Items 1 through 5 below:

  1. Solar pool heating system with a solar collector surface area that is equivalent to 65 percent or greater of the surface areas of the pool or spa or a combination of both respectively; or
  2. A heat pump pool heater as the primary heating system that meets the sizing requirements of Reference Joint Appendix JA16.3. The control for the heat pump pool heater shall meet the requirements specified in Section 110.4(d). The supplementary heater can be of any energy source; or
  3. A heating system that derives at least 60 percent of the annual heating energy from on-site renewable energy or on-site recovered energy; or
  4. A combination of a solar pool heating system and heat pump pool heater without any additional supplementary heater;

or

  1. A pool heating system determined by the Energy Commission Executive Director to use no more energy than the systems specified in Item 1, 2, 3, or 4 above.

Exception 1 to A5.204.1.1: Portable electric spas compliant with 20 CCR, Section 1605.3(g)(7) of the Appliance Efficiency Regulations.

Exception 2 to A5.204.1.1: A pool or spa that is heated solely by a solar pool heating system without any supplementary heater.

Exception 3 to A5.204.1.1: An existing building with inadequate Solar Access Roof Area (SARA) as specified in Section 140.10(a) for a solar pool heating system to be installed.

Exception 4 to A5.204.1.1: Heating systems which are used exclusively for permanent spa applications in existing buildings with gas availability.

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▸Contents — California Green Building Standards Code (Title 24, Part 11)
California Green Building Standards Code (Title 24, Part 11)
  1. Chapter 1 — ADMINISTRATION
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GREEN BUILDING
  4. Chapter 4 — RESIDENTIAL MANDATORY MEASURES
  5. Chapter 4 — RESIDENTIAL MANDATORY MEASURES
  6. Chapter 4 — RESIDENTIAL MANDATORY MEASURES
  7. Chapter 4 — RESIDENTIAL MANDATORY MEASURES
  8. Chapter 4 — RESIDENTIAL MANDATORY MEASURES
  9. Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES
  10. Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES
  11. Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES
  12. Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES
  13. Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES
  14. Chapter 6 — REFERENCED ORGANIZATIONS AND STANDARDS
  15. Chapter 7 — INSTALLER AND SPECIAL INSPECTOR QUALIFICATIONS
  16. Chapter 8 — COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL
  17. Appendix A4
  18. ▸Appendix A5
    Overview
    1. Section A5.101 — GENERAL
    2. Section A5.102 — DEFINITIONS
    3. Section A5.103 — SITE SELECTION
    4. Section A5.104 — SITE PRESERVATION
    5. Section A5.105 — DECONSTRUCTION AND REUSE OF EXISTING STRUCTURES
    6. Section A5.106 — SITE DEVELOPMENT
    7. Section A5.107 — BIRD-FRIENDLY BUILDING DESIGN
    8. Section A5.201 — GENERAL
    9. Section A5.202 — DEFINITIONS
    10. Section A5.203 — PERFORMANCE APPROACH
    11. Section A5.204 — MANDATORY REQUIREMENTS FOR ALTERATIONS TO EXI…
    12. Section A5.211 — RESERVED
    13. Section A5.212 — ELEVATORS, ESCALATORS AND OTHER EQUIPMENT
    14. Section A5.213 — ENERGY EFFICIENT FRAMING
    15. Section A5.301 — GENERAL
    16. Section A5.302 — DEFINITIONS
    17. Section A5.303 — INDOOR WATER USE
    18. Section A5.304 — OUTDOOR WATER USE
    19. Section A5.305 — WATER REUSE
    20. Section A5.401 — GENERAL
    21. Section A5.402 — DEFINITIONS
    22. Section A5.403 — FOUNDATION SYSTEMS
    23. Section A5.404 — EFFICIENT FRAMING TECHNIQUES
    24. Section A5.405 — MATERIAL SOURCES
    25. Section A5.406 — ENHANCED DURABILITY AND REDUCED MAINTENANCE
    26. Section A5.408 — CONSTRUCTION WASTE REDUCTION, DISPOSAL AND RE…
    27. Section A5.409 — LIFE CYCLE ASSESSMENT
    28. Section A5.501 — GENERAL
    29. Section A5.502 — DEFINITIONS
    30. Section A5.504 — POLLUTANT CONTROL
    31. Section A5.507 — ENVIRONMENTAL COMFORT
    32. Section A5.508 — OUTDOOR AIR QUALITY
  19. Appendix A6

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