A building’s energy decisions also shape long-term choices about its operation. LEED v5 provides a framework that considers these decisions alongside carbon objectives. Project teams need to understand which design questions follow from the certification objective. Discussing the objective, scope and data needs together at the outset helps connect analysis results more clearly with architectural and engineering decisions.
Understand the scope of the carbon objective
LEED v5’s decarbonisation approach addresses operational, embodied, refrigerant and transportation emissions. Quality of life and ecological conservation and restoration are its other core impact areas. The framework calls for different environmental impacts to be considered alongside energy efficiency. USGBC — LEED v5.
It is useful to turn this broad objective into practical questions at design meetings. Which need will an envelope, system or operating decision address? Which assessment will examine an option’s impact? Working through these questions helps teams understand how different studies contribute to the same objective. Establishing the answer expected from an analysis also reduces unnecessary uncertainty about scope.
Connect planning with the prerequisite
Operational carbon projection and decarbonisation planning form a prerequisite in LEED v5 BD+C. A prerequisite is a requirement that must be met within the relevant system; it is different from a credit that earns additional points. This distinction supports planning application requirements alongside selected performance objectives. USGBC — LEED v5 BD+C rating system.
For investors, the value of planning is that the objective extends beyond an application document. Teams can discuss the proposed design’s operating assumptions and options that could be considered later. They can agree which decisions will be confirmed now, which need further information and who is responsible. Technical preparation can then follow the project’s actual decision programme.
Read energy results alongside carbon results
Energy modelling calculates building energy behaviour using geometry, construction characteristics, systems, climate and operating information. The approach helps compare design options. US Department of Energy — Building energy modelling.
An assessment should make clear what energy consumption, cost and emissions indicators mean. Understanding an option’s consumption impact does not imply the same proportional cost or carbon impact. The energy sources and factors used for emissions accounting should be explained separately. Our article on greenhouse gas emissions in building projects discusses this general framework.
It is useful for the decision-maker’s report to show the assumptions underlying a comparison. If an operating schedule changes, for example, its effect should not be confused with a design change. Understanding the reasons for a result helps teams identify what to examine in the next revision.
Prepare inputs and responsibilities
Current architectural drawings, envelope properties and mechanical and electrical system descriptions can be considered when preparing an energy analysis. Operating assumptions and systems not yet selected should also be identified clearly. Teams should discuss how changing information will be communicated as the design develops.
LEED consulting and energy modelling can be undertaken by the same team or different teams. In either case, it is useful to agree who provides each input, when results will be considered and how review questions will be coordinated. This arrangement helps reduce the risk of proceeding with documents describing different project revisions.
Select a pathway appropriate to the project
The rating system and version should be considered alongside project scope and registration status. New construction, interiors and operational assessments should not be assumed to share identical requirements. USGBC — Rating system selection.
AECO’s LEED consulting and building energy modelling services can consider objectives, necessary analyses and team coordination together. Modelling for a project led by another consultant can also be treated as a separate technical scope. Share your project stage and the decisions you need to support to clarify preparation information.