Chapter 1 — GENERAL CODE PROVISIONS
104.5 Fees. Fees shall be assessed in accordance with 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.
provisions of this section and as set forth in the fee schedule, Table 104.5. The fees are to be determined and adopted by this jurisdiction. 104.5.1 Work Commencing Before Permit Issuance. Where work for which a permit is required by this code has been commenced without first obtaining said permit, a special investigation shall be made before a permit is issued for such work. 104.5.2 Investigation Fees. An investigation fee, in addition to the permit fee, shall be collected whether or not a permit is then or subsequently issued. The investigation fee shall be equal to the amount of the permit fee
that is required by this code if a permit were to be issued. The payment of such investigation fee shall not exempt a person from compliance with other provisions of this code, nor from a penalty prescribed by law. 104.5.3 Fee Refunds. The Authority Having Jurisdiction shall be permitted to authorize the refunding of a fee as follows:
(1) The amount paid hereunder that was erroneously paid or collected.
(2) Refunding of not more than a percentage, as determined by this jurisdiction where no work has been done under a permit issued in accordance with this code.
The Authority Having Jurisdiction shall not authorize refunding of a fee paid except upon written application filed by the original permittee not to exceed 180 days after the date of fee payment.
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Ask AI about this code▸Contents — California Mechanical Code (Title 24, Part 4)
▸Chapter 1 — GENERAL CODE PROVISIONS
Overview- 301.7 OSHPD 1R . . . . . . . . . . . . . . . . . . . 51
- 306.2 Building Automation Systems . . . . 56
- 311.5 California Energy Code
- 318.1 Applicability . . . . . . . . . . . . . . . . . . 60
- 318.2 Services/Systems and Utilities . . . . 60
- 319.1 Requirements for Hospitals and
- 319.2 Requirements for Skilled
- 320.1 Requirements for Hospitals and
- 320.2 Requirements for Skilled
- 320.3 Requirements for Outpatient
- 320.4 Telephone and Technology
- 320.5 Psychiatric Services. . . . . . . . . . . . 61
- 401.3 Filters . . . . . . . . . . . . . . . . . . . . . . . 69
- 407.1 General. . . . . . . . . . . . . . . . . . . . . . 78
- 407.2 Outdoor Air Intakes and
- 407.3 Air Balance. . . . . . . . . . . . . . . . . . . 78
- 407.4 Air Circulation . . . . . . . . . . . . . . . . . 78
- 407.5 Variable Air Volume . . . . . . . . . . . . 79
- 407.6 Economizers. . . . . . . . . . . . . . . . . . 79
- 407.7 Unoccupied Turndown. . . . . . . . . . 79
- 407.8 Building Pressurization . . . . . . . . . 80
- 408.1 General. . . . . . . . . . . . . . . . . . . . . . 80
- 408.2 Filters for Hospitals. . . . . . . . . . . . . 80
- 408.3 Filters for Skilled Nursing
- 408.4 Filters for Outpatient Facilities . . . . 80
- 408.5 Filters for Recirculating
- 410.1 Laboratory Ventilating Systems . . . 80
- 410.2 Exhaust Hoods and
- 410.3 Laboratory Fume Hoods . . . . . . . . 80
- 414.1 Exhaust Systems . . . . . . . . . . . . . . 81
- 414.2 Air Distribution . . . . . . . . . . . . . . . . 81
- 415.1 Air Distribution . . . . . . . . . . . . . . . . 82
- 418.1 Air Changes . . . . . . . . . . . . . . . . . . 82
- 418.2 Exhaust Requirements . . . . . . . . . . 82
- 418.3 Ventilation Requirements . . . . . . . . 82
- 418.4 Gas Valves . . . . . . . . . . . . . . . . . . . 82
- 418.5 Alarm Systems . . . . . . . . . . . . . . . . 83
- 419.1 Formula Preparation Area . . . . . . . 83
- 419.2 Treatment Area/Room . . . . . . . . . . 83
- 505.12 Pharmacies – Compounding
- 507.7 Pharmaceutical Compounding
- 609.2 Air-Moving Systems and
- 1602.2 Liquid-Fueled Engines and
- 104.2 Items (1) through (5) of this code.
- 101.1 Title. This document shall be known as the “Uniform
- 101.2 Scope. The provisions of this code shall apply to the
- 101.3 Purpose. This code is an ordinance providing minimum req…
- 101.4 Unconstitutional. Where a section, subsection, sentence,…
- 101.5 Validity. Where a provision of this code, or the applica…
- 102.1 Conflicts Between Codes. Where the requirements
- 102.2 Existing Installations. Mechanical systems lawfully
- 102.3 Maintenance. Mechanical systems, materials, and
- 102.4 Additions, Alterations, Renovations, or
- 102.5 Health and Safety. Where compliance with the provisions …
- 102.6 Changes in Building Occupancy. Mechanical
- 102.7 Moved Structures. Parts of the mechanical system of
- 102.8 Appendices. The provisions in the appendices are
- 103.1 General. The Authority Having Jurisdiction shall be
- 103.2 Liability. The Authority Having Jurisdiction charged
- 103.3 Applications and Permits. The Authority Having
- 103.4 Right of Entry. Where it is necessary to make an
- 104.1 Permits Required. It shall be unlawful for a person,
- 104.2 Exempt Work. A permit shall not be required for the
- 104.3 Application for Permit. To obtain a permit, the
- 104.4 Permit Issuance. The application, construction documents…
- 104.5 Fees. Fees shall be assessed in accordance with the
- 105.1 General. Mechanical systems for which a permit is
- 105.2 Required Inspections. New mechanical system
- 105.3 Testing of Systems. Mechanical systems shall be
- 105.4 Connection to Service Utilities. No person shall
- 106.1 General. It shall be unlawful for a person, firm, or
- 106.2 Notices of Correction or Violation. Notices of
- 106.3 Penalties. A person, firm, or corporation violating a
- 106.4 Stop Orders. Where work is being done contrary to
- 106.5 Authority to Disconnect Utilities in Emergen-
- 106.6 Authority to Condemn. Where the Authority Having Jurisdi…
- 107.1 General. In order to hear and decide appeals of orders,
- 107.2 Limitations of Authority. The Board of Appeals
- Chapter 2 — DEFINITIONS
- Chapter 3 — GENERAL REGULATIONS
- Chapter 4 — VENTILATION AIR
- Chapter 5 — EXHAUST SYSTEMS
- Chapter 6 — DUCT SYSTEMS
- Chapter 7 — COMBUSTION AIR
- Chapter 8 — CHIMNEYS AND VENTS
- Chapter 9 — INSTALLATION OF SPECIFIC APPLIANCES
- Chapter 10 — BOILERS AND PRESSURE VESSELS
- Chapter 11 — REFRIGERATION
- Chapter 12 — HYDRONICS
- Chapter 13 — FUEL GAS PIPING
- Chapter 14 — PROCESS PIPING
- Chapter 15 — SOLAR ENERGY SYSTEMS
- Chapter 16 — STATIONARY POWER PLANTS
- Chapter 17 — GEOTHERMAL ENERGY SYSTEMS AND AMBIENT TEMPERATURE…
- Chapter 18 — REFERENCED STANDARDS
- Appendix A — RESIDENTIAL PLAN EXAMINER REVIEW FORM FOR HVAC SY…
- Appendix B — PROCEDURES TO BE FOLLOWED TO PLACE GAS EQUIPMENT …
- Appendix C — INSTALLATION AND TESTING OF OIL (LIQUID) FUEL-FIR…
- Appendix D — FUEL SUPPLY: MANUFACTURED/MOBILE HOME PARKS AND R…
- Appendix E — SUSTAINABLE PRACTICES
- Appendix F — SIZING OF VENTING SYSTEMS AND OUTDOOR COMBUSTION …
- Appendix G — EXAMPLE CALCULATION OF OUTDOOR AIR RATE
- Appendix H — PROFESSIONAL QUALIFICATIONS
- Appendix I — INDOOR HORTICULTURAL FACILITIES
- Appendix J — CLEAN AIR DELIVERY