The by-law is intended for owners of existing buildings in the commercial and institutional sectors, and large multi-unit residential buildings of 2,000 m² or more or of 25 dwelling units or more.

Exceptions

• Buildings whose predominant use on the property assessment roll includes an industry
• Buildings occupied in whole or in part by a company, facility or establishment subject to section 6.1 of the Regulation respecting the mandatory reporting of certain emissions of contaminants into the air (CQLR, chapter Q-2, r. 15).

The fact that a building appears or does not appear on this list cannot be interpreted as exempting anyone from compliance with by-law 21-042 or any other applicable municipal by-law. The list of buildings subject to this requirement has been compiled based on preliminary data and is subject to change. Its only purpose is to serve as a reference for building owners.

For questions or changes to the list, please e-mail [email protected].

I already have an ENERGY STAR Portfolio Manager® (ESPM) account:   

Transfer your 2025 data to the city by following this link: Montréal - Disclosure for 2025 - By-Law 21-042 (in French)) 

• Log in to the platform and confirm that the complete data for the year has been uploaded to ESPM (step 5 of the Detailed Guide);
• Check the quality of the data and submit it;
• Check the e-mail address registered on the ESPM platform to make sure you were sent an acknowledgement of receipt e-mail
• If necessary, you can check the acknowledgement of receipt in ESPM (step 5 of the Detailed Guide).

To help you: Detailed Guide (in French, updated August 2026)

I do not have an ENERGY STAR Portfolio Manager® (ESPM) account:   

1 – Find the building ID under “Identifiant standard Montréal ‐ Divulgation ID” in the list of buildings subject to the by-law (in French). If you cannot find your building even though it meets the criteria, contact the disclosure rating team by e-mail. Make sure you mention the building’s address and land registry identification number. 

2 – Use the ENERGY STAR Portfolio Manager® (ESPM) portal to transmit the data required by the by-law:   

• Have all essential information about the building at hand (see the Detailed Guide).
• Create an account and add your buildings.
• Enter the information required under the by-law.
• Activate transfer of energy consumption data from Hydro-Québec and Énergir in your ESPM account (step 4 of the Detailed Guide).

E-mail the city’s disclosure rating department to get the form provided by the city.

Owners of large buildings must submit monthly energy consumption data for the entire building to the city by June 30 of each year. The data must cover the period from January 1 to December 31 of the previous year.

This information collected will let the city draw a complete portrait of greenhouse gas (GHG) emissions from large buildings in Montréal. This portrait will be used to develop programs to improve buildings’ energy performance.

The disclosure and rating system for large buildings, and the future integration of performance thresholds as foreseen in the Climate Plan 2020-2030, will have important benefits for building owners and Montréal residents.

This system will:

• Track GHG emissions from buildings and compare them to similar buildings in Montréal.
• Target measures to improve building performance and assess their impact.
• Reduce costs and GHG emissions by taking these measures.
• Show that Montréal building owners are leaders in energy transition, a major competitive advantage in the real estate sector.

Any questions?

E-mail: [email protected].