To ensure a snug fit, make sure that you measure the diagonal measurements of your skylight (top right corner to bottom left corner and top left corner to bottom right corner). If these measurements differ by more than a ¼” you will have to shim your skylight opening to make room for the shade and retainer track.
Width: Measure the exact inside measurement of the window at the Top, Middle and Bottom. Write these measurements down, and then circle the narrowest width measurement.
Length: Measure the exact inside distance from top of the window to the sill at the Left, Middle and Right. Write down your measurements and then circle the shortest length measurement.
For a more comprehensive guide for measuring for skylight shades, download our complete skylight measuring instructions PDF.