Boulder enforces one of the strictest residential and commercial green building codes in the United States, requiring high insulation, electrification readiness, on-site renewables for larger projects, and HERS-rating compliance under BRC Title 10.
The Boulder Energy Conservation Code, adopted under BRC Title 10, layers above the International Energy Conservation Code with city amendments aligned to the Climate Action Plan. New homes must meet aggressive HERS-index targets; major remodels trigger envelope and equipment upgrades. Larger new construction requires solar PV or solar-ready roofs and EV-ready parking. SmartRegs governs older rental housing efficiency. Commercial buildings face benchmarking and Building Performance standards. The code is recalibrated regularly to track Boulder's net-zero goals, making it a national reference point for municipal climate-aligned building regulation.
Permit denial; certificate-of-occupancy holds until HERS or commissioning reports are accepted; SmartRegs noncompliance bars rental licensing renewals.
Boulder, CO
Boulder requires building permits for solar panel installations. Permit processes vary but most jurisdictions have streamlined solar permitting. Roof-mounted...
Boulder, CO
Boulder voters in 2006 approved the nation's first municipal carbon tax, the Climate Action Plan (CAP) Tax, charging electricity users by kilowatt-hour to fu...
See how Boulder's green building code rules stack up against other locations.
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