Size Guide
Find Your Window & Door Size
Standard rough-opening sizes, how to measure correctly, and how custom sizing works.
Standard Window Sizes (Rough Opening)
Common U.S. residential dimensions. All sizes can be customized.
| Width × Height (inches) | Common Use | Series |
|---|---|---|
| 24″ × 36″ | Small bathroom / utility | Casement, Fixed |
| 24″ × 48″ | Bedroom side | Casement, Double-Hung |
| 30″ × 36″ | Kitchen / bath | Awning, Casement |
| 30″ × 48″ | Standard bedroom | Double-Hung, Casement |
| 30″ × 60″ | Tall bedroom / living | Casement, Fixed |
| 36″ × 36″ | Kitchen over sink | Awning, Slider |
| 36″ × 48″ | Living room standard | Double-Hung, Casement |
| 36″ × 60″ | Large living / dining | Casement, Picture |
| 48″ × 48″ | Wide picture window | Fixed, Slider |
| 48″ × 60″ | Grand living / view | Picture, Multi-Slide |
How to Measure Your Opening
Measure the rough opening (stud to stud), not the old frame.
1
Measure the Width
Measure across the opening at the top, middle, and bottom. Use the smallest of the three measurements.
2
Measure the Height
Measure from the sill to the header at the left, center, and right. Use the smallest measurement.
3
Measure the Depth
Confirm the wall depth (2×4 / 2×6 construction) so the frame fits flush with interior and exterior finishes.
Need a Non-Standard Size?
Every Lansen window and door is built to your exact dimensions. Send us your rough opening or floor plan and we’ll return an engineer-reviewed quote.
Request Custom Sizing