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Montreal By-law 21‑042: What Owners of Large Buildings Need to Know

Why this by-law?

The real estate sector alone accounts for nearly 30% of Montreal’s GHG emissions.

By-law 21-042 therefore aims to:

  • Measure the energy performance of existing buildings;

  • Raise awareness among owners about climate issues;

  • Promote energy-efficient renovations;

  • Reward good practices through a rating system.

Who is affected?

The by-law applies to all buildings located within the territory of the City of Montreal (excluding other municipalities in the agglomeration), as long as:

  • The building has a floor area ≥ 2,000 m², or

  • It contains 25 or more residential units.

Application is progressive, but since 2024, all buildings in this category are now required to disclose their data.

What must you do?

Every year, before June 30, you must:

  1. Collect your building’s energy consumption data (electricity, gas, oil, etc.) for the period from January 1 to December 31 of the previous year.

  2. Report this data to the City using the ENERGY STAR Portfolio Manager® tool.

  3. Display the GHG rating assigned by the City at the main entrance of your building.

What this means in practice

To comply:

  • Create or update your ENERGY STAR Portfolio Manager® profile;

  • Ensure you have access to all your energy bills;

  • Obtain co-owner consent if you manage a condominium association (in some cases);

  • Plan data collection at the start of the year.

Automated tools can simplify data import from Hydro-Québec or Énergir.

What if I do not comply with the by-law?

The City of Montreal has established penalties for non-compliance:

  • Fines ranging from $500 to $4,000, depending on severity and repeat offenses;

  • The obligation to comply promptly, with administrative follow-up.

What are the benefits for you?

Beyond the legal requirement, this by-law can become a strategic opportunity:

  • Reduction of your energy costs;

  • Higher resale or rental value;

  • Improved environmental image of your building;

  • Access to grants or assistance programs for energy-efficient renovations.

Need help complying?

Several specialized firms, such as HBGC Engineers, offer turnkey support to:

  • Create or set up your ENERGY STAR account;

  • Analyze your energy data;

  • Prepare your official declaration;

  • Identify solutions to reduce your emissions in the long term.

In conclusion

By-law 21‑042 is not just a regulatory requirement: it is an opportunity to embrace sustainability and better understand the environmental impact of your buildings.

Owners, managers, condominium associations: the energy transition starts with you!

Entrust us with the process, make your projects a reality.

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