TM54
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What is a TM54?
TM54 is a CIBSE methodology for predicting operational energy and carbon at the design stage. It focuses on how a building will actually perform, not just how it meets compliance requirements. By analysing realistic occupancy, controls, small-power loads and operating hours, TM54 delivers upper and lower energy estimates that you can depend on. The result is more accurate budgeting, lower operational risk, and a proven pathway to net zero.
Unlike compliance tools such as SBEM, TM54 is designed for performance-based decision making. It captures both regulated and unregulated energy uses, such as lifts, catering, and ICT, providing a complete view of real-world energy performance.
Do You Need a TM54 Assessment?
If your goal is to understand how a building will truly perform once occupied, you need a TM54 assessment. It tests real-life conditions rather than theoretical compliance, ensuring that budgets, plant sizing, and carbon strategies are grounded in operational reality.
A TM54 study reduces risk for designers and developers by setting credible energy targets, identifying high-load areas early, and establishing metering and controls that remain effective after handover.
The Benefits of TM54 Assessments
TM54 considers both regulated and unregulated energy loads, including ICT, catering, lifts, and out-of-hours usage. This enables more accurate forecasting, fewer performance surprises, and stronger alignment between design intent and operational reality.
It also promotes collaboration between architects, engineers, and facilities teams. Everyone works from shared assumptions on occupancy, controls, and small-power usage, improving commissioning, soft landings, and long-term maintenance.
How Much Could You Save?
By analysing occupancy, control settings, and small-power profiles, TM54 highlights the true drivers of energy and cost. Addressing these early can reduce oversizing, cut bills, and improve comfort.
Design teams often realise major value through smarter zoning, optimised schedules, right-sized plant, and a metering plan that supports post-occupancy tuning and ESG reporting.
What Is Included in a TM54 Assessment Report?
A TM54 report is structured for clear decision-making and compliance with sustainability benchmarks. It typically includes:
- Executive summary with annual operational energy by end use and fuel
- Monthly profiles for energy and carbon tracking
- Sensitivity analysis with upper, central, and lower results
- Design and control recommendations
- Inputs register and TM54 methodology appendix
- Integration with RICS Whole Life Carbon and NABERS UK frameworks
- Metering and monitoring plan for verification at handover and in use
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Everything You Need to Know
TM54 is a CIBSE framework for predicting real operational energy and carbon use at design stage, closing the gap between design intent and actual building performance.
Architects, M&E engineers, sustainability consultants, and developers seeking credible operational energy predictions that align with net-zero objectives.
It provides realistic projections of energy and carbon performance, supporting cost control, ESG targets, and planning compliance.
Typically during the design or refurbishment stages, or whenever major systems or layouts are being reconsidered.
Predicted energy by end use, monthly energy and carbon profiles, sensitivity testing, and detailed design recommendations.
Accurate forecasting, reduced energy waste, lower operating costs, and stronger sustainability credentials.