How to Shade Staircase Windows: Trapezoid Shades Explained
Windows along staircases follow the slope, creating trapezoid shapes that no standard shade fits. Here's how to measure each window and order matching shades.
If your staircase has windows, chances are they follow the slope of the stairs. That means each window has a slight angle at the top — creating a trapezoid shape instead of a perfect rectangle.
Standard shades don't fit. The straight top edge leaves a triangular gap along the slope. It looks wrong, it lets in light, and it defeats the purpose of the shade.
Identifying Left vs. Right Trapezoids
Stand inside, face the window. The angled side (the shorter side) determines the direction:
- Left Trapezoid — the shorter, angled side is on your left
- Right Trapezoid — the shorter, angled side is on your right
As you walk up the staircase, the windows may alternate — or they may all angle the same way depending on which wall the staircase follows.
Measuring Staircase Windows
Each window in a staircase series needs four measurements:
1. Top width — horizontal distance across the top 2. Bottom width — horizontal distance across the bottom (should match or be very close to top width) 3. Left height — the height on the left side 4. Right height — the height on the right side
The difference between left and right height determines the angle. Even a 1-inch difference creates a noticeable angle that a standard rectangular shade can't match.
Critical: Measure each window individually. Staircase framing is rarely consistent — each step shifts the angle slightly.
Ordering a Matching Set
For staircase windows, consistency is everything. You want:
- Same fabric across all windows — order them together so we cut from the same roll (dye lots vary between rolls)
- Correct left/right designation for each window
- Individual measurements for each window (don't assume they're all the same)
Flat Top vs. Regular Trapezoid
There's an important distinction:
Regular trapezoid — the angle is at the top. The shade is stationary (fixed).
Flat top trapezoid — the top is flat and level, the angle is at the bottom. Because the top is flat, this shade CAN roll up and down on a standard roller tube.
Most staircase windows are regular trapezoids (angle at top). But if your windows have a level header and the sill follows the staircase slope, you have flat top trapezoids — and you get the bonus of operable shades.
Installation Tips
Staircase windows are usually at an awkward height — too high for comfortable reach, too low for scaffolding. A step ladder on the stairs works for most installations, but be careful about stability.
Mount the brackets along the straight edges first, then attach the shade and tension it against the angled edge. We include angle-specific templates with every trapezoid order.