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When do we need to apply for an HVAC permit in Ontario?

  • Writer: Matt M.
    Matt M.
  • May 12, 2023
  • 2 min read

Updated: Jul 5, 2023

In Ontario, we need to apply for a building permit for any installation, alteration or repair of a heating, ventilation and air conditioning (HVAC) system if it involves the addition, removal, or replacement of any part of the system. It also requires a building permit if it affects the structure or size of the building, involves ductwork or changes to the building envelope, such as the addition of vents or exhaust hoods. Building permits are issued by the local municipality and are necessary to ensure that HVAC systems meet safety and building standards.


Here's a brief summary of common HVAC permit applications:


  1. New construction; new house, new commercial establishment.

  2. Installation or modification of an existing HVAC system for both residential and commercial applications.

  3. Population density solutions such as laneway suites / garden suites, secondary suite / basement apartments, duplex, triplex, quadplex.

  4. Building an addition to an existing structure.

  5. New commercial range hood / make up air unit.

  6. A change of use permit for a commercial establishment (i.e. turning a nail salon to a restaurant).


The municipality will require the building permit applicant to provide a certified HVAC document set, containing ventilation calculations, heat loss/gain calculations, and a set of mechanical schematic drawings, that will portray the requirements and solutions for heating and ventilating the property for which the application is made.


Important information to have in your HVAC permit documents' set:

  1. Application form “Permit to Construct or Demolish”

  2. Schedule 1: Designer Information

  3. Ventilation Design Summary

  4. Heat Loss and Gain Calculations

  5. Duct design calculation sheets

  6. Floor Plans and Drawings containing:

  • Label and use of all rooms on all floors

  • Illustrated heating equipment location and the size and location of all duct work and registers (supply and return)

  • Illustrated ventilation equipment location


Check your municipality's requirements for HVAC building permits, for their specific requirements.


Choose a professional for your Ontario HVAC building permit.

Choose Aeris.

Call us today 647-328-4212


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