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Earlier editions: 20222019

Chapter 1 — GENERAL CODE PROVISIONS

104.4 Permit Issuance.

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.

The application, construction documents, and other data filed by an applicant for a permit shall be reviewed by the Authority Having Jurisdiction. Such plans shall be permitted to be reviewed by other departments of this jurisdiction to verify compliance with applicable laws under their jurisdiction. Where the Authority Having Jurisdiction finds that the work described in an application for permit and the plans, specifications, and other data filed therewith are in accordance with the requirements of the code and other pertinent laws and ordinances and that the fees specified in Section 104.5 have been paid, the Authority Having Jurisdiction shall issue a permit therefore to the applicant.

104.4.1 Approved Plans or Construction Docu- ments. Where the Authority Having Jurisdiction issues the permit where plans are required, the Authority Having Jurisdiction shall endorse in writing or stamp the construction documents “APPROVED.” Such approved construction documents shall not be changed, modified, or altered without authorization from the Authority Having Jurisdiction, and the work shall be done in accordance with approved plans.

The Authority Having Jurisdiction shall be permitted to issue a permit for the construction of a part of a mechanical system before the entire construction documents for the whole system have been submitted or approved, provided adequate information and detailed statements have been filed in accordance with pertinent requirements of this code. The holder of such permit shall be permitted to proceed at the holder’s risk without assurance that the permit for the entire building, structure, or mechanical system will be granted.

104.4.2 Validity of Permit. The issuance of a permit or approval of construction documents shall not be construed to be a permit for, or an approval of, a violation of the provisions of this code or other ordinance of the jurisdiction. No permit presuming to give authority to violate or cancel the provisions of this code shall be valid.

The issuance of a permit based upon plans, specifications, or other data shall not prevent the Authority Having Jurisdiction from thereafter requiring the correction of errors in said plans, specifications, and other data or from preventing building operations being carried on thereunder where in violation of this code or of other ordinances of this jurisdiction. 104.4.3 Expiration. A permit issued by the Authority Having Jurisdiction under the provisions of this code shall expire by limitation and become null and void where the work authorized by such permit is not commenced within 180 days from the date of such permit, or where the work authorized by such permit is suspended or abandoned at a time after the work is commenced for a period of 180 days. Before such work is recommenced, a new permit shall first be obtained to do so, and the fee, therefore, shall be one-half the amount required for a new permit for such work, provided no changes have been

DIVISION II SCOPE AND ADMINISTRATION

made or will be made in the original construction documents for such work, and provided further that such suspension or abandonment has not exceeded 1 year. 104.4.3.1 Expiration. [BSC] On or after January 1, 2019, every permit issued shall become invalid unless the work on the site authorized by such per- mit is commenced within 12 months after its issuance or if the work authorized on the site by such permit is suspended or abandoned for a period of 12 months after the time the work is commenced. The building official is authorized to grant, in writ- ing, one or more extensions of time, for periods not more than 180 days each. The extension shall be requested in writing and justifiable cause demon- strated. (See Health and Safety Code Section 18938.5 and 18938.6). 104.4.4 Extension. A permittee holding an unexpired permit shall be permitted to apply for an extension of the time within which work shall be permitted to commence under that permit where the permittee is unable to commence work within the time required by this section. The Authority Having Jurisdiction shall be permitted to extend the time for action by the permittee for a period not exceeding 180 days upon written request by the permittee showing that circumstances beyond the control of the permittee have prevented action from being taken. No permit shall be extended more than once. In order to renew action on a permit after expiration, the permittee shall pay a new full permit fee. 104.4.5 Suspension or Revocation. The Authority Having Jurisdiction shall be permitted, with written notification, to suspend or revoke a permit issued under the provisions of this code where the permit is issued in error or on the basis of incorrect information supplied or in violation of other ordinance or regulation of the jurisdiction.

104.4.6 Retention of Plans. One set of approved construction documents and computations shall be retained by the Authority Having Jurisdiction until final approval of the work is covered therein.

One set of approved construction documents, computations, and manufacturer’s installation instructions shall be returned to the applicant, and said set shall be kept on the site of the building or work at times during which the work authorized thereby is in progress.

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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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