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Chapter 1 — GENERAL CODE PROVISIONS

105.1 General.

California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-12 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

Mechanical systems for which a permit is required by this code shall be inspected by the Authority Having Jurisdiction.

No mechanical system or portion thereof shall be covered, concealed, or put into use until inspected and approved as prescribed in this code. Neither the Authority Having Jurisdiction nor the jurisdiction shall be liable for expense entailed in the removal or replacement of material required to permit inspection. Mechanical systems regulated by this code shall not be connected to the energy fuel supply lines until authorized by the Authority Having Jurisdiction.

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▸Contents — California Mechanical Code (Title 24, Part 4)
California Mechanical Code (Title 24, Part 4)
  1. ▸Chapter 1 — GENERAL CODE PROVISIONS
    Overview
    1. 104.2 Items (1) through (5) of this code.
    2. 101.1 Title.
    3. 101.2 Scope.
    4. 101.3 Purpose.
    5. 101.4 Unconstitutional.
    6. 101.5 Validity.
    7. 102.1 Conflicts Between Codes.
    8. 102.2 Existing Installations.
    9. 102.3 Maintenance.
    10. 102.4 Additions, Alterations, Renovations, or Repairs.
    11. 102.5 Health and Safety.
    12. 102.6 Changes in Building Occupancy.
    13. 102.7 Moved Structures.
    14. 102.8 Appendices.
    15. 103.1 General.
    16. 103.2 Liability.
    17. 103.3 Applications and Permits.
    18. 103.4 Right of Entry.
    19. 104.1 Permits Required.
    20. 104.2 Exempt Work.
    21. 104.3 Application for Permit.
    22. 104.4 Permit Issuance.
    23. 104.5 Fees.
    24. 105.1 General.
    25. 105.2 Required Inspections.
    26. 105.3 Testing of Systems.
    27. 105.4 Connection to Service Utilities.
    28. 106.1 General.
    29. 106.2 Notices of Correction or Violation.
    30. 106.3 Penalties.
    31. 106.4 Stop Orders.
    32. 106.5 Authority to Disconnect Utilities in Emergen-cies.
    33. 106.6 Authority to Condemn.
    34. 107.1 General.
    35. 107.2 Limitations of Authority.
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GENERAL REGULATIONS
  4. Chapter 4 — VENTILATION AIR
  5. Chapter 5 — EXHAUST SYSTEMS
  6. Chapter 6 — DUCT SYSTEMS
  7. Chapter 7 — COMBUSTION AIR
  8. Chapter 8 — CHIMNEYS AND VENTS
  9. Chapter 9 — INSTALLATION OF SPECIFIC APPLIANCES
  10. Chapter 10 — BOILERS AND PRESSURE VESSELS
  11. Chapter 11 — REFRIGERATION
  12. Chapter 12 — HYDRONICS
  13. Chapter 13 — FUEL GAS PIPING
  14. Chapter 14 — PROCESS PIPING
  15. Chapter 15 — SOLAR ENERGY SYSTEMS
  16. Chapter 16 — STATIONARY POWER PLANTS
  17. Chapter 17 — GEOTHERMAL ENERGY SYSTEMS AND AMBIENT TEMPERATURE…
  18. Chapter 18 — REFERENCED STANDARDS
  19. Appendix A — RESIDENTIAL PLAN EXAMINER REVIEW FORM FOR HVAC SY…
  20. Appendix B — PROCEDURES TO BE FOLLOWED TO PLACE GAS EQUIPMENT …
  21. Appendix C — INSTALLATION AND TESTING OF OIL (LIQUID) FUEL-FIR…
  22. Appendix D — FUEL SUPPLY: MANUFACTURED/MOBILE HOME PARKS AND R…
  23. Appendix E — SUSTAINABLE PRACTICES
  24. Appendix F — SIZING OF VENTING SYSTEMS AND OUTDOOR COMBUSTION …
  25. Appendix G — EXAMPLE CALCULATION OF OUTDOOR AIR RATE
  26. Appendix H — PROFESSIONAL QUALIFICATIONS
  27. Appendix I — INDOOR HORTICULTURAL FACILITIES
  28. Appendix J — CLEAN AIR DELIVERY

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