Summary: This Tip helps permit applicants understand the Seattle Energy Code requirements regarding fenestration. The term “fenestration” includes not only windows, but also curtain wall, storefront glazing, glazed entrance doors, skylights, and other assemblies that allow daylight into our buildings. Plentiful daylight with a connection to nature and weather is important for our health and wellbeing, as well as reducing the electricity we need for artificial lighting.
Date Revised: 05/06/2025