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GHG emissions, energy, and water reporting for existing buildings
This is the first edition of CSA Z5040, GHG emissions, energy, and water reporting for existing buildings . CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of BC Hydro, Efficiency Manitoba, Efficiency Nova Scotia, EfficiencyOne, Electricity Canada, Hydro-Québec, Natural Resources Canada, Nova Scotia's Department of Energy, and Québec's Ministère de l'Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs. This Standard was prepared by the Subcommittee on GHG Emissions, Energy, and Water Reporting for Existing Buildings, under the jurisdiction of the Technical Committee on Building Energy Systems and the Strategic Steering Committee on Performance, Energy Efficiency, and Renewables, and has been formally approved by the Technical Committee. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.
This Standard describes the steps and components of a mandatory energy, water, and GHG emissions reporting requirement for large existing buildings. The aim is to help standardize their design and implementation, reducing the burden and complexity for both AHJs and building owners subject to such requirements.
This Standard supports the consistent design and implementation of mandatory building energy, water, and GHG emissions reporting requirements for existing buildings. While enacting a reporting requirement can be a starting point for the development of other policies and programs (e.g., building performance standards, labelling), this Standard focuses exclusively on building energy, water, and GHG emissions reporting.
This Standard applies to all buildings with the following major occupancies as classified in the National Building Code
Note: Annex A provides an overview of these major occupancies and specific property types
This Standard does not apply to buildings classified as
This Standard is intended to assist municipal and regional governments in their capacity as AHJs over the regulation of buildings across their communities. Its broad intent is to standardize and simplify the process of complying with such requirements, especially for owners of portfolios that span multiple jurisdictions. Other public sector organizations might also find this Standard of interest but should consider that not all aspects of this Standard might apply to their particular needs or authorities.
In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.
The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.
| SDO | CSA: Canadian Standards Association |
| Document Number | |
| Publication Date | Jan. 1, 2026 |
| Language | en - English |
| Page Count | 47 |
| Revision Level | |
| Supercedes | |
| Committee |
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