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Montreal By-law 21-042 Compliance

Energy Benchmarking & Greenhouse Gas Reporting for Large Buildings

If you own or manage a qualifying building in Montréal, By-law 21-042 requires annual reporting of building energy consumption and greenhouse gas emissions.

Zenith Net-Zero provides end-to-end support for By-law 21-042 compliance, from data collection and benchmarking through validation and submission.

Who Must Comply?

The By-law applies to:

✔ Buildings 2,000 m² (21,528 ft²) or larger

✔ Condominium buildings with 25 or more dwelling units

✔ Commercial and institutional building owners required to report annual energy consumption and greenhouse gas emissions

Missed the Deadline?

The June 30, 2026 reporting deadline has passed, but property owners may still be able to submit their declaration.

If you have not yet reported, Zenith Net-Zero can help prepare and submit your information as quickly as possible.

End-to-End Compliance Support

By-law 21-042 compliance is mandatory.
We make it effortless.

Compliance with By-law 21-042 can be time-consuming. Gathering utility data, maintaining ENERGY STAR Portfolio Manager, validating information, and preparing submissions all require careful attention.

Zenith Net-Zero manages the entire process on your behalf, helping ensure your reporting is accurate, complete, and submitted efficiently.

We manage every step:

  • Set up or update your ENERGY STAR Portfolio Manager account

  • Collect and upload utility and building data

  • Validate your energy and emissions information

  • Prepare the required benchmarking reports

  • Submit your declaration to the City of Montréal

  • Provide ongoing support for future reporting years

Need Support with By-law 21-042 Compliance?

Whether you need to confirm your reporting obligations, prepare a declaration, or address an outstanding requirement, Zenith Net-Zero can provide practical, end-to-end support.

Tell us how we can assist, and our team will be in touch shortly.

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