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How to Measure for an Inside Mount Bay Window


Measuring for Bay Windows can be an easy task if you follow our directions. Generally, even with the most precise measurements there will be light/privacy gaps in the corners. This should not be considered a measuring mistake. It happens because when two blinds or shades meet in a corner only the front edges meet up and the blind or shade itself is normally slightly smaller in width than the headrail.

To start measuring you need the depth of the bracket/headrail for the blinds type you wish to use. Select the product you are using in the Bay Window and write down the depth value associated with it.

  • 2" & 2-1/2" Blinds - 2-1/2"
  • 1/2" & 1" Aluminum Blinds - 1-3/4"
  • 1" Wood Blinds - 1 7/8"
  • 3/4" Cellular Shades (Std. Lift) - 2-1/4"
  • 1/2" Cellular Shades (Std. Lift) - 1-7/8"
  • 3/8" Cellular Shades (Std. Lift) - 1-7/8"
  • Cellular Shades (Premium Lift/Cordless) - 1-5/8"
  • Pleated Shades - 1-1/2"
  • Roman Shades - 1-7/8"
  • Bamboo Shades - 2-1/4"
  • Roller Shades (w/Spring) - 2"
  • Roller Shades (w/Clutch & Windows less than 60" wide) - 2-1/2"
  • Roller Shades (w/Clutch & Windows 60" or greater wide) - 3-1/8"
  • Sheerweave Shades (Windows less than 60" wide) - 2-1/2"
  • Sheerweave Shades (Windows 60" or greater wide) - 3-1/8"
  • All Vertical Blinds - 3-1/4"
  • Window Shadings - 3-1/8"




Now to measure the widths of each blind needed for the Bay Window.

  • Where the Left section of the window meets the Center section: From the Left window Section, Measure out the distance of the depth for the blind type you are using. At this point make a small mark on your ceiling demonstrated by the red line on figure 1.
  • Where the Center section of the window meets the Left section: From the Center window Section, Measure out the distance of the depth for the blind type you are using. At this point make a small mark on your ceiling demonstrated by the red line on figure 1.
  • At the point where these two marks meet is the point where the blinds will butt up against each other. This point will be point A.
  • Where the Right section of the window meets the Center section: From the Right window Section, Measure out the distance of the depth for the blind type you are using. At this point make a small mark on your ceiling demonstrated by the red line on figure 1.
  • Where the Center section of the window meets the Right section: From the Center window Section, Measure out the distance of the depth for the blind type you are using. At this point make a small mark on your ceiling demonstrated by the red line on figure 1.
  • At the point where these two marks meet is the point where the blinds will butt up against each other. This point will be point B.
  • Now Measure the distance from point A to point B. Subtract 1/8" from this distance and that is the width of your Center blind (Shown in Yellow in Figure 1).
  • Measure from the left side of the left wall to point A. Subtract 1/8" from this distance and that is the width of your Left blind (Shown in Yellow in Figure 1).
  • Measure from the right side of the right wall to point B. Subtract 1/8" from this distance and that is the width of your Right blind (Shown in Yellow in Figure 1).
  • IMPORTANT: Order as Outside Mount (so no deductions are taken by the Factory) and in the 'Notes Section' of the order page request Inside Mount Brackets if mounting to the ceiling or top of window opening.



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