San Diego

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Mechanical Permit

Mechanical Permits ensure that projects comply with the minimum standards that help safeguard life or limb, public health, property and welfare. No part of heating, ventilating, air conditioning, or refrigeration systems shall be installed, altered, replaced or repaired unless a Mechanical Permit has been obtained for the work except as exempted below.

Municipal Code:

  1. PDF icon Mechanical Permit Procedures:  

    1. Who may prepare Plans, Reports, Calculations, etc?
      Mechanical plans and calculations shall be stamped and signed in accordance with the California Business and Professions Code. The mechanical plans and calculations shall be signed by a licensed mechanical engineer. An architect or civil engineer can sign the Mechanical plans only if he or she has designed the project as the responsible designer of the mechanical system. A mechanical contractor can sign and stamp the mechanical plans and calculations and/or Title 24 energy compliance for the mechanical system only if he/she is responsible for both the design and installation of the system. PDF icon Project Submittal Requirements, Section 2

    2. PDF icon Mechanical Permit Expiration and Extension

  2. Additions and Modifications to the California Codes


PDF icon Exemptions from an Mechanical Permit: A Mechanical Permit is not required for the following heating, ventilation, air conditioning, or refrigeration repair work however, exemption from the permit requirements of the Mechanical Regulations does not authorize any work to be done in any manner in violation of the provisions of the Mechanical Regulations or any other applicable local or state regulations. 

  • Repairing heating, ventilation, air conditioning, or refrigeration equipment, provided the work does not require removal of the equipment from its installed position or the replacement of faulty controls, valves, driers, or filters in the system
  • Installing temperature controls, repairing leaks, or recharging refrigeration compressors or systems
  • Servicing, or repairing ice machines
  • Installing self-contained refrigerators or freezers
  • Installing a portable heating appliance, portable ventilating equipment, a portable cooling unit, or a portable evaporative cooler
  • Replacement of piping in a closed system of steam, hot, or chilled water piping within heating or cooling equipment
  • Replacement of any component part of assembly of an appliance that does not alter its original approval
  • Installing or servicing refrigerating equipment that is a part of equipment for which a permit has previously been approved.

Submittal Requirements:

  1. Single Dwelling Unit/Duplex
  2. All Other Buildings and Structures, PDF icon Construction Permits – Structures, Section 2, Item No. 7.0
    Mechanical plans and calculations are required for all buildings and structures other than one-and two-family dwellings except when the installation qualifies for a no-plan permit (Simple Permit).

Fee Schedule:


Publications and Resources: