Purpose and objectives

The primary objective of SN 591390/1:2025 is to establish a comprehensive framework for assessing and reporting greenhouse gas emissions associated with buildings. By promoting net-zero emissions by 2050, the standard aims to facilitate the transition towards sustainable construction practices. This includes defining methods for calculating emissions across various building types and encouraging the use of energy efficiency measures and renewable energy sources. Ultimately, the standard seeks to support the Swiss Federal Law on Climate Protection by aligning building practices with national climate goals.

Scope: who must comply

SN 591390/1:2025 applies to a broad range of stakeholders in the construction and real estate sectors, including:

• Architects and engineers involved in the design and construction of buildings.
• Developers and contractors engaged in new constructions and renovations.
• Building owners and operators responsible for ongoing management and maintenance of properties.

Typical industries affected include residential, commercial, educational, and retail sectors. Compliance with SN 591390/1:2025 is essential for organizations aiming to meet sustainability targets and regulatory requirements to reduce greenhouse gas emissions.

How SN 591390/1:2025 relates to other standards

SN 591390/1:2025 is part of a broader framework of standards aimed at sustainability and emissions reduction. Related standards include:

• SIA 2040:2017: This standard provides guidelines for energy efficiency in buildings, complementing the greenhouse gas accounting focus of SN 591390/1:2025.
• ISO 14064: An international standard for greenhouse gas accounting and verification, which aligns with the life cycle assessment principles of SN 591390/1:2025.
• SIA 2050: A future-oriented standard that will address long-term climate strategies and is expected to build on the frameworks established by SN 591390/1:2025.

Revision history and current status

The SN 591390/1:2025 was published by the Swiss Federal Office for the Environment in 2025. This recent revision has introduced updated methodologies for calculating greenhouse gas emissions and clarified compliance requirements for different building types. Enhancements also focus on integrating circular economy principles and resource conservation strategies into the life cycle assessment process for buildings.