New Colorado Law Mandates Energy Star Windows and Doors: What Homeowners Need to Know

Big Changes Coming in 2026

Starting in January 2026, a groundbreaking new law in Colorado will require all residential structures three stories or lower to use Energy Star-rated windows, doors, and skylights. This legislation, House Bill 23-1161, is part of a broader effort to improve energy efficiency and environmental standards across the state. While this change supports sustainability, it also brings unique challenges, especially for homeowners and businesses in Colorado’s high-altitude regions.

Energy Star Standards and High-Altitude Challenges

The new law mandates that fenestration products must meet Energy Star criteria for the Northern climate zone, even though parts of Colorado fall within the North-Central climate zone. For areas like Denver and the Front Range, altitude-related issues complicate compliance. At elevations above 5,000 feet, insulating glass units (IGUs) can face problems like bowing, glass breakage, and performance loss.

To counteract these challenges, many IGUs at high altitudes use breather or capillary tubes, which unfortunately compromise the use of Argon gas—a key factor in improving energy efficiency. Without Argon, achieving the low U-values required by Energy Star 7.0 becomes even more difficult.

What This Means for Homeowners

This law impacts homeowners and builders across Colorado. By requiring Energy Star-rated products, it encourages energy savings and reduces environmental impact. However, compliance might come with higher costs, especially for those living in high-altitude areas. If you’re planning to replace your windows or doors soon, it’s essential to consult with experienced professionals, like the team at Remod, who understand the unique challenges of Colorado’s climate and elevation.

Enforcement and Penalties

To ensure compliance, Colorado plans to monitor retailers and distributors with spot checks and even mystery shopping. A reporting hotline will allow individuals to anonymously report violations, with fines of up to $2,000 per window for non-compliance. Custom-made windows for historically designated buildings are the only exceptions.

How Remod Can Help

At Remod Home Solutions, we’re here to guide you through these changes. Our partnerships with industry leaders and expertise in Colorado’s unique market ensure we can help you find solutions that meet both the legal requirements and the specific needs of your home.

This law represents a significant shift for homeowners, builders, and window providers in Colorado. Stay ahead of the curve—reach out to us today to learn how Energy Star-rated windows and doors can improve your home’s efficiency, reduce energy bills, and comply with these new standards.

Have questions? Contact us today to discuss your window and door needs!