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European Windows & Doors in Colorado
Made-to-order tilt-turn windows, folding doors and lift & slide doors, shipped to homeowners and builders in 5 Colorado cities. Your contractor or an independent local installer handles installation.
City by city
Window energy rules across Colorado
Each city's climate zone, the energy code it enforces for new homes, and the highest window U-factor that code allows (lower is better). SwingTilt's triple-pane windows have a U-factor of 0.19.
| City | Climate zone | Energy code for new homes | Max window U |
|---|---|---|---|
| Aurora | 5B | 2021 IECC, adopted by the city | 0.32 |
| Boulder | 5B | 2024 City of Boulder Energy Conservation Code | 0.27 |
| Colorado Springs | 5B | 2021 IECC (Pikes Peak Regional Building Department) | 0.32 |
| Denver | 5B | 2025 Denver Energy Code (2021 IECC based) | 0.27 |
| Fort Collins | 5B | 2024 IECC with Fort Collins amendments | 0.30 |
Checked October 2026; sources are linked on each city page. Codes change — confirm with your local building department.