Building Energy Codes Mandate Higher-Performance Glazing Broadly
Building energy code tightening across the International Energy Conservation Code and European Union Energy Performance of Buildings Directive has expanded rapidly since 2023, mandating higher U-factor and solar heat gain performance that standard double-pane glazing cannot satisfy without low-E coating and gas fill upgrades. More than a dozen major jurisdictions adopted stricter energy code editions since 2023, each requiring documented thermal performance certification before builders can obtain occupancy permits for new construction. Fabricators offering pre-certified, high-performance triple-pane systems are capturing specification share fastest, while fabricators without thermal certification face growing exclusion from code-compliant projects.
Market Impact: Shifts 17 percent of retrofit volume








