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Earlier editions: 20222019

Chapter 1 — GENERAL CODE PROVISIONS

104.3 Application for Permit. To obtain a permit, the

California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-10 · California

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

applicant shall first file an application therefore in writing on a form furnished by the Authority Having Jurisdiction for that purpose. Such application shall:

(1) Identify and describe the work to be covered by the permit for which application is made.

22 2025 CALIFORNIA MECHANICAL CODE

DIVISION II SCOPE AND ADMINISTRATION

(2) Describe the land upon which the proposed work is to be done by legal description, street address, or similar description that will readily identify and definitely locate the proposed building or work.

(3) Indicate the use or occupancy for which the proposed work is intended.

(4) Be accompanied by construction documents and other data in accordance with Section 104.3.1.

(5) Be signed by the permittee or the permittee’s authorized agent. The Authority Having Jurisdiction shall be permitted to require evidence to indicate such authority.

(6) Give such other data and information in accordance with the Authority Having Jurisdiction.

104.3.1 Construction Documents. Construction documents, engineering calculations, diagrams, and other data shall be submitted in two or more sets, or in a digital format where permitted by the Authority Having Jurisdiction, with each application for a permit. The construction documents, computations, and specifications shall be prepared by, and the mechanical system designed by, a registered design professional. Construction documents shall be drawn to scale with clarity to identify that the intended work to be performed is in accordance with the code.

Exception: The Authority Having Jurisdiction shall be permitted to waive the submission of construction documents, calculations, or other data where the Authority Having Jurisdiction finds that the nature of the work applied for is such that reviewing of construction documents is not necessary to obtain compliance with the code.

104.3.2 Plan Review Fees. Where a plan or other data is required to be submitted in accordance with Section 104.3.1, a plan review fee shall be paid at the time of submitting construction documents for review.

The plan review fees for mechanical system work shall be determined and adopted by this jurisdiction.

The plan review fees specified in this subsection are separate fees from the permit fees specified in Section 104.5.

Where plans are incomplete or changed so as to require additional review, a fee shall be charged at the rate shown in Table 104.5.

104.3.3 Time Limitation of Application. Applications for which no permit is issued within 180 days following the date of application shall expire by limitation, plans and other data submitted for review thereafter, shall be returned to the applicant or destroyed by the Authority Having Jurisdiction. The Authority Having Jurisdiction shall be permitted to extend the time for action by the applicant for a period not to exceed 180 days upon request by the applicant showing that circumstances beyond the control of the applicant have prevented action from being taken. No application shall be extended more than once. In order to renew action on an application

after expiration, the applicant shall resubmit plans and pay a new plan review fee.

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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. 301.7 OSHPD 1R . . . . . . . . . . . . . . . . . . . 51
    2. 306.2 Building Automation Systems . . . . 56
    3. 311.5 California Energy Code
    4. 318.1 Applicability . . . . . . . . . . . . . . . . . . 60
    5. 318.2 Services/Systems and Utilities . . . . 60
    6. 319.1 Requirements for Hospitals and
    7. 319.2 Requirements for Skilled
    8. 320.1 Requirements for Hospitals and
    9. 320.2 Requirements for Skilled
    10. 320.3 Requirements for Outpatient
    11. 320.4 Telephone and Technology
    12. 320.5 Psychiatric Services. . . . . . . . . . . . 61
    13. 401.3 Filters . . . . . . . . . . . . . . . . . . . . . . . 69
    14. 407.1 General. . . . . . . . . . . . . . . . . . . . . . 78
    15. 407.2 Outdoor Air Intakes and
    16. 407.3 Air Balance. . . . . . . . . . . . . . . . . . . 78
    17. 407.4 Air Circulation . . . . . . . . . . . . . . . . . 78
    18. 407.5 Variable Air Volume . . . . . . . . . . . . 79
    19. 407.6 Economizers. . . . . . . . . . . . . . . . . . 79
    20. 407.7 Unoccupied Turndown. . . . . . . . . . 79
    21. 407.8 Building Pressurization . . . . . . . . . 80
    22. 408.1 General. . . . . . . . . . . . . . . . . . . . . . 80
    23. 408.2 Filters for Hospitals. . . . . . . . . . . . . 80
    24. 408.3 Filters for Skilled Nursing
    25. 408.4 Filters for Outpatient Facilities . . . . 80
    26. 408.5 Filters for Recirculating
    27. 410.1 Laboratory Ventilating Systems . . . 80
    28. 410.2 Exhaust Hoods and
    29. 410.3 Laboratory Fume Hoods . . . . . . . . 80
    30. 414.1 Exhaust Systems . . . . . . . . . . . . . . 81
    31. 414.2 Air Distribution . . . . . . . . . . . . . . . . 81
    32. 415.1 Air Distribution . . . . . . . . . . . . . . . . 82
    33. 418.1 Air Changes . . . . . . . . . . . . . . . . . . 82
    34. 418.2 Exhaust Requirements . . . . . . . . . . 82
    35. 418.3 Ventilation Requirements . . . . . . . . 82
    36. 418.4 Gas Valves . . . . . . . . . . . . . . . . . . . 82
    37. 418.5 Alarm Systems . . . . . . . . . . . . . . . . 83
    38. 419.1 Formula Preparation Area . . . . . . . 83
    39. 419.2 Treatment Area/Room . . . . . . . . . . 83
    40. 505.12 Pharmacies – Compounding
    41. 507.7 Pharmaceutical Compounding
    42. 609.2 Air-Moving Systems and
    43. 1602.2 Liquid-Fueled Engines and
    44. 104.2 Items (1) through (5) of this code.
    45. 101.1 Title. This document shall be known as the “Uniform
    46. 101.2 Scope. The provisions of this code shall apply to the
    47. 101.3 Purpose. This code is an ordinance providing minimum req…
    48. 101.4 Unconstitutional. Where a section, subsection, sentence,…
    49. 101.5 Validity. Where a provision of this code, or the applica…
    50. 102.1 Conflicts Between Codes. Where the requirements
    51. 102.2 Existing Installations. Mechanical systems lawfully
    52. 102.3 Maintenance. Mechanical systems, materials, and
    53. 102.4 Additions, Alterations, Renovations, or
    54. 102.5 Health and Safety. Where compliance with the provisions …
    55. 102.6 Changes in Building Occupancy. Mechanical
    56. 102.7 Moved Structures. Parts of the mechanical system of
    57. 102.8 Appendices. The provisions in the appendices are
    58. 103.1 General. The Authority Having Jurisdiction shall be
    59. 103.2 Liability. The Authority Having Jurisdiction charged
    60. 103.3 Applications and Permits. The Authority Having
    61. 103.4 Right of Entry. Where it is necessary to make an
    62. 104.1 Permits Required. It shall be unlawful for a person,
    63. 104.2 Exempt Work. A permit shall not be required for the
    64. 104.3 Application for Permit. To obtain a permit, the
    65. 104.4 Permit Issuance. The application, construction documents…
    66. 104.5 Fees. Fees shall be assessed in accordance with the
    67. 105.1 General. Mechanical systems for which a permit is
    68. 105.2 Required Inspections. New mechanical system
    69. 105.3 Testing of Systems. Mechanical systems shall be
    70. 105.4 Connection to Service Utilities. No person shall
    71. 106.1 General. It shall be unlawful for a person, firm, or
    72. 106.2 Notices of Correction or Violation. Notices of
    73. 106.3 Penalties. A person, firm, or corporation violating a
    74. 106.4 Stop Orders. Where work is being done contrary to
    75. 106.5 Authority to Disconnect Utilities in Emergen-
    76. 106.6 Authority to Condemn. Where the Authority Having Jurisdi…
    77. 107.1 General. In order to hear and decide appeals of orders,
    78. 107.2 Limitations of Authority. The Board of Appeals
  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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