Provincial building codes and HVAC: Alberta, BC and Ontario

Building regulation in Canada is a provincial responsibility. The national model codes published by the National Research Council are the starting point, but each province decides which edition to adopt, when, and with what changes. Larger cities sometimes add their own requirements on top. For HVAC work, the building code is only one piece: gas installations, refrigeration systems, boilers and pressure vessels, and electrical work are each governed by separate codes and regulators.

This guide summarizes the situation in Alberta, British Columbia and Ontario, where most of our work takes place. Code adoption changes regularly, so always confirm the editions in force on the date of permit application with the local authority having jurisdiction.

The common foundation

All three provinces base their building codes on the National Building Code of Canada (NBC), and most of the HVAC content of Part 6 and Part 9 is similar across them. They also reference many of the same standards, including ASHRAE 62.1 for ventilation, CSA B149.1 for gas, CSA B52 for refrigeration, CSA Z317.2 for health care HVAC and NFPA 96 for commercial kitchen exhaust. See our overview of the National Building Code HVAC requirements.

The differences tend to be in energy efficiency, administration, professional involvement and a handful of technical amendments.

Summary comparison

The table is a simplified guide. Each row has exceptions and transition provisions.

Alberta

Alberta adopts the national codes through the Safety Codes Act, publishing an Alberta Edition of the NBC. The National Building Code - 2023 Alberta Edition came into force on May 1, 2024, along with updated fire, plumbing and energy codes.

Points relevant to HVAC:

• Energy: Alberta applies the NECB to larger buildings and Section 9.36 to housing and small buildings. Energy performance tiers allow Alberta to raise requirements over time.
• Administration: permits and inspections are handled by accredited municipalities, or by accredited agencies in areas without municipal accreditation. Building, gas, plumbing and electrical permits are separate disciplines.
• Pressure equipment and refrigeration: ABSA, the Alberta pressure equipment safety authority, administers boilers, pressure vessels and refrigeration systems, which brings CSA B52 and CSA B51 into play for larger plants.
• Climate: Alberta's design temperatures are among the coldest of the three provinces, and many Alberta sites are at significant altitude. See air density, altitude and HVAC design in Calgary.

British Columbia

British Columbia publishes the BC Building Code, based on the NBC with BC amendments. The 2024 BC Building Code came into effect in March 2024. The City of Vancouver is the exception, regulating construction through its own Vancouver Building By-law, which is generally more demanding on energy and emissions.

Points relevant to HVAC:

• Energy Step Code: BC's performance-based Energy Step Code sets progressively higher steps for energy efficiency. Local governments can require higher steps than the provincial minimum, so requirements vary between municipalities.
• Zero Carbon Step Code: introduced in 2023, it sets greenhouse gas intensity levels for new buildings. Higher levels effectively require low-carbon heating systems such as heat pumps, which has a direct impact on HVAC design.
• Energy compliance paths: larger buildings may comply with the NECB or ASHRAE 90.1 editions referenced in the code, or through the Step Code using energy modelling. See ASHRAE 90.1 vs NECB.
• Seismic: much of BC, particularly the Lower Mainland and Vancouver Island, has high seismic hazard, so seismic restraint of HVAC equipment, piping and ductwork receives close attention.
• Technical Safety BC: administers gas, refrigeration, boiler and pressure vessel, and electrical safety under the Safety Standards Act.

Ontario

The Ontario Building Code (OBC) is a regulation under the Building Code Act. It follows the NBC's broad structure but has more Ontario-specific content than the Alberta or BC codes. The 2024 edition came into force on January 1, 2025, bringing Ontario closer to the 2020 national codes while retaining many Ontario provisions.

Points relevant to HVAC:

• Energy efficiency: for larger buildings, the OBC references Supplementary Standard SB-10, which sets compliance paths based on ASHRAE 90.1 or the NECB with Ontario modifications. Housing follows SB-12. The City of Toronto's Green Standard adds higher performance tiers for many projects.
• Designer qualification: in addition to professional engineers and architects, the OBC recognizes qualified designers registered with a Building Code Identification Number (BCIN) for certain building types. Larger and more complex buildings require a professional engineer or architect.
• General review: the OBC requires general review by an architect or professional engineer during construction of buildings that require their involvement.
• TSSA: the Technical Standards and Safety Authority administers fuels, including gas installations to CSA B149.1, and boilers, pressure vessels and refrigeration under the operating engineers regulation, which references CSA B52.

Gas and refrigeration codes in practice

Gas and refrigeration installations are regulated outside the building code in all three provinces:

1. CSA B149.1 governs natural gas and propane installations, including HVAC appliances, venting and combustion air. Provinces adopt specific editions; a 2025 edition was published, and each province adopts it on its own schedule. See CSA B149 gas installations.
2. CSA B52 governs mechanical refrigeration systems, including refrigerant quantity limits, machinery rooms and the use of A2L refrigerants. Provinces have been adopting the 2023 edition on different dates.
3. Licensing of gas fitters, refrigeration mechanics and other trades is provincial, with different certificate classes in each province.

Practical advice

• Check code editions at the permit application date, since transition periods allow the previous edition for a limited time.
• Check municipal requirements in Vancouver, Toronto and other large cities, especially for energy and emissions.
• Identify early whether gas, refrigeration or pressure equipment approvals are needed in addition to the building permit.
• When working across provinces, avoid assuming that a detail approved in one province will be accepted in another.

Key takeaways

• Alberta, BC and Ontario all base their building codes on the NBC but adopt it on their own schedules with amendments.
• Energy requirements differ the most, with BC's Step Codes and Ontario's SB-10 adding provincial approaches.
• Gas and refrigeration are regulated separately from the building code by provincial safety authorities.
• Vancouver and Toronto add municipal requirements on top of provincial codes.
• Always confirm the edition and amendments in force with the authority having jurisdiction.