← Service Areas
European Windows & Doors in Montana
Made-to-order tilt-turn windows, folding doors and lift & slide doors, shipped to homeowners and builders in 3 Montana cities. Your contractor or an independent local installer handles installation.
City by city
Window energy rules across Montana
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 |
|---|---|---|---|
| Billings | 6B | 2024 IECC with Montana amendments (statewide since 9/26/2026) | 0.30 |
| Bozeman | 6B | Being confirmed | — |
| Missoula | 6B | 2024 IECC with Montana amendments (statewide since 9/26/2026) | 0.30 |
Checked October 2026; sources are linked on each city page. Codes change — confirm with your local building department.