CIBSE TM39 Building Metering and Monitoring guide updated

CIBSE has published the updated TM39: Building Metering and Monitoring, marking a major revision of the industry’s guidance on metering.

Since the 2009 edition of CIBSE TM39, metering installations have grown to meet new challenges such as technological advances, the climate crisis, rapid growth in renewable energy, changes in national and global fuel supply infrastructure and pricing, growing demand for load management over a range of timescales, and more.

The 2026 revision of CIBSE TM39 benefits from experience with existing metering installations. Good metering yields both general and project-specific insights into energy use, enabling better energy management and benchmarking. Design and facilities teams can use metered data to correlate predicted performance with in-use outcomes, fine-tuning as they go. Metered data can benefit industry, government, researchers and occupiers, and can feed into more powerful methods of building energy certification during design and in use.

Good metering forms the foundation of building performance that is proven and verified by successful and reliable measurement. In turn, measured building performance forms the basis of compliance with many climate-related disclosure standards and items of legislation.

TM39: Building Metering and Monitoring describes and promotes best practice for the design, specification, installation, commissioning, data export, and use of energy metering and submetering data in non-domestic buildings. It provides guidance for new and existing buildings and is a resource for designers, owner-occupiers, facilities managers, landlords (and letting/managing agents acting on their behalf), tenants, managers, staff, and all others who benefit from the energy data that metering and monitoring can provide

cibse.org