Skip to content

Earlier editions: 20222019

Chapter 1 — GENERAL CODE PROVISIONS

105.2 Required Inspections. New mechanical system

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.

work and such portions of existing systems as affected by new work, or changes, shall be inspected by the Authority Having Jurisdiction to ensure compliance with the requirements of this code and to ensure that the installation and construction of the mechanical system are in accordance with approved plans. The Authority Having Jurisdiction shall make the following inspections and other such inspections as necessary. The permittee or the permittee’s authorized agent shall be responsible for the scheduling of such inspections as follows:

(1) Underground inspection shall be made after trenches or ditches are excavated and bedded, piping installed, and before backfill is put in place.

(2) Rough-in inspection shall be made prior to the installation of wall or ceiling membranes.

(3) Final inspection shall be made upon completion of the installation.

105.2.1 Uncovering. Where a mechanical system, or part thereof, which is installed, altered, or repaired, is covered or concealed before being inspected, tested, and approved as prescribed in this code, it shall be uncovered for inspection after notice to uncover the work has been issued to the responsible person by the Authority Having Jurisdiction. The requirements of this section shall not be considered to prohibit the operation of mechanical systems installed to replace existing equipment serving

24 2025 CALIFORNIA MECHANICAL CODE

DIVISION II SCOPE AND ADMINISTRATION

an occupied portion of the building in the event a request for inspection of such equipment has been filed with the Authority Having Jurisdiction not more than 72 hours after such replacement work is completed, and before a portion of such mechanical system is concealed by a permanent portion of the building. 105.2.2 Other Inspections. In addition to the inspections required by this code, the Authority Having Jurisdiction shall be permitted to require other inspections to ascertain compliance with the provisions of this code and other laws that are enforced by the Authority Having Jurisdiction.

105.2.3 Inspection Requests. It shall be the duty of the person doing the work authorized by a permit to notify the Authority Having Jurisdiction that such work is ready for inspection. The Authority Having Jurisdiction shall be permitted to require that a request for inspection be filed not less than 1 working day before such inspection is desired. Such request shall be permitted to be made in writing or by telephone, at the option of the Authority Having Jurisdiction.

It shall be the duty of the person requesting inspections in accordance with this code to provide access to and means for inspection of such work.

105.2.4 Advance Notice. It shall be the duty of the person doing the work authorized by the permit to notify the Authority Having Jurisdiction, orally or in writing that said work is ready for inspection. Such notification shall be given not less than 24 hours before the work is to be inspected.

105.2.5 Responsibility. It shall be the duty of the holder of a permit to make sure that the work will stand the test prescribed before giving the notification.

The equipment, material, and labor necessary for inspection or tests shall be furnished by the person to whom the permit is issued or by whom inspection is requested.

105.2.6 Reinspections. A reinspection fee shall be permitted to be assessed for each inspection or reinspection where such portion of work for which inspection is called is not complete or where required corrections have not been made.

This provision shall not be interpreted as requiring reinspection fees the first time a job is rejected for failure to be in accordance with the requirements of this code, but as controlling the practice of calling for inspections before the job is ready for inspection or reinspection.

Reinspection fees shall be permitted to be assessed where the approved plans are not readily available to the inspector, for failure to provide access on the date for which the inspection is requested, or for deviating from plans requiring the approval of the Authority Having Jurisdiction.

To obtain reinspection, the applicant shall file an application therefore in writing upon a form furnished

for that purpose and pay the reinspection fee in accordance with Table 104.5.

In instances where reinspection fees have been assessed, no additional inspection of the work will be performed until the required fees have been paid.

Get a plain-English answer with a citation back to this text.

Ask AI about this code
Export this section
▸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

GoCodebook provides public access, search, citation, multilingual explanation, and practical interpretation of legally adopted building regulations. It is not a substitute for the official ICC or California code publications.