Measuring Your Windows for Horizontal Blinds
Things to Remember:
Use a steel tape for accuracy.
Measure the exact width of the window at 3 different places. Use the narrowest
measurement and write it down.
Measure the exact length from top of window opening to bottom sill. Use the
shortest measurement and write it down.
Make all measurements to the nearest 1/8 inch.
Do not take your own deductions. The factory will take necessary deductions and
Double check all measurements.
Blinds may be mounted inside or outside the window casing. See below for specific
Vertical Blinds require special measuring considerations which are outlined below.
Inside Mount (see diagram below)
The window covering will hang inside the window frame. We recommend an inside mount
whenever possible for a neater look.
1.Width: Width: Measure the EXACT distance across the window from the inside edge of the
frame to the opposite inside edge in three places. Use the narrowest dimension.
2.Height: Measure the EXACT distance from the top inside edge of the frame to the bottom inside
edge of the frame in three places. Use the longest dimension for horizontal coverings, and the
shortest for vertical coverings.
3.Window Depth: The amount of space from the back of the window or obstruction to the windows outer
edge (see below).
4.See the Sill Depth Chart below for the minimum sill depth needed for installation and the minimum
needed for the product to be flush with the front.
1.50" for 1" and 1/2" Mini Blinds, 3/8" Honeycomb Shades and Pleated Shades
2.25" for 1" Wood Blinds and 3/4" Honeycomb Shades
3.00" for 2" Aluminum Blinds and 2" Wood Blinds
4.75" for Vertical Blinds
Outside Mount (see diagram below)
The window covering will hang outside the actual window frame, over lapping the window frame for
maximum privacy and light blockage. Please note that blinds require a flat surface for mounting.
If you have a casement around your window, you may mount the headrail directly on the casement, but
not on the wall outside of it. In order to make the width of the blind extend beyond the width of
the casement, it is necessary to mount the headrail above the casement. If you have questions, please
call us at 1-800-443-0423.
1.Width: Measure the EXACT distance from the outside edge of the left side of the window frame to the
outside edge of the right side of the window frame and add at least 2 inches on each side (4 inches total).
2.Height: Measure the EXACT distance from the top outside edge of the window frame the bottom outside edge
of the frame and add at least 3 inches for horizontal blinds and 4 inches for verticals.
3.If there is a sill, or if blind will go to the floor, add 3" to length for mounting 3" above the frame.
4.If there is no sill, add 3" to length for mounting above the frame and 3" below for light and privacy control.
5.Leave room for the mounting brackets, which are about 2-1/2" tall.
If you have a measuring situation that was not covered here, it is most likely covered in the section called special
measuring situations. In that section we cover French and sliding doors, curved windows and many other topics.