Public review of proposed change to the 2020 National Model Codes

This national public review runs from January 20, 2025 to February 24, 2025.

The Canadian Board for Harmonized Construction Codes (CBHCC) invites code users, the Codes community, and the public to participate in the winter 2025 public review of a proposed change to the 2020 edition of the National Building Code of Canada (NBC). The proposed change included in this public review addresses the following topic in the NBC:

Overheating in new dwelling units (Parts 1, 6 and 9):

Adds a maximum indoor air temperature for new dwelling units.

The purpose of this public review is to:

provide code users, the Codes community, and the public with a detailed look at proposed technical changes, and
seek comment on each proposed technical change as to whether it should be approved, altered or withdrawn.

The public review will close at 11:59 pm PST on February 24, 2025, after which comments will no longer be accepted. The result of the public review process is a collection of comments on proposed code changes. The comments are sorted and analyzed by Codes Canada staff who are familiar with the development of the proposed changes, and who develop a draft resolution to each comment. The draft resolutions are validated by the responsible code development committees, which form the recommendations to the CBHCC. The recommendations could be one of the following:

approve for publication,
revise for publication,
defer publication pending further development – subject to subsequent public review, or
withdraw proposed code change.

The CBHCC decides which changes will be published in the next edition of the National Model Codes based on the recommendations of the code development committees.

Steps for submitting comments on proposed changes

Step 1: Read the guidelines for writing comments.
Step 2: Read the instructions for submitting comments.
Step 3: Read the proposed changes.
Step 4: If you have a comment, click the “Submit a comment” link located at the beginning of each proposed change, which will take you to the online comment form. Only comment forms that are submitted online will be accepted.

You may submit other related documents, such as reports, by e-mail or mail.
Important: submit one comment form per proposed change. If you are commenting on more than one proposed change, use a separate form for each one.

Thank you for contributing to the development of the National Model Codes.

Important links:

Supporting documents and combined proposed change forms are available in PDF file format

Winter 2025: Proposed change to NBC 2020 – combined file (PDF – 624 KB)

Winter 2025: Proposed change to NBC 2020 – supporting documents (PDF – 1,674 KB)