What is the 40/60 Rule used for?

• A. Certification deadlines
• B. Determining energy performance
• C. Method to choose which rating system is appropriate
• D. Determining project budget

Answer: (C)

The 40/60 Rule is a quick way to decide which LEED rating system to apply when a project includes both new construction and major renovations of existing space. The idea is to compare how much of the project’s gross floor area is new versus existing. If 60% or more is new construction, you pursue the LEED rating for New Construction (or Core & Shell as appropriate). If 60% or more is existing space, you pursue the LEED rating for Existing Buildings: Operations & Maintenance. The 40/60 split name comes from that threshold between the two paths, helping you align the project with the system that matches the dominant activity.