Building Energy Code
Minimum energy efficiency standards for new construction and major renovations, set by states/cities based on IECC or ASHRAE 90.1. Some states now require solar-ready or solar-equipped new homes.
Why It Matters
California, Washington, and other states require solar on new homes. Even where not required, building to above-code standards saves thousands in lifetime energy costs.
Related Terms
Building Performance Standard (BPS)
A policy that sets energy performance targets for existing buildings, requiring improvements over time. Applied by city or state to commercial buildings and large multifamily.
ENERGY STAR
A U.S. EPA/DOE program that certifies products meeting energy efficiency standards above federal minimums. ENERGY STAR products use 10-50% less energy than standard models.
HERS Index (Home Energy Rating System)
A scoring system from 0-150+ that rates a home's energy efficiency. A HERS Index of 100 equals the reference home; lower scores are more efficient. A net-zero home scores 0.