Based on the window design, you have choice to mount your hard window covering mounted inside or outside the window casing. Please ensure to measure your windows carefully with a wooden, metal rule, or steel tape. Use of cloth tape is not recommended.
 
For Woven Woods (Wood & Faux Wood) - The factory tolerance for width is +/- 1/8" & length is 3/4".
For 2" Horizontal Blinds (Wood & Faux Wood) - The factory tolerance for width is +/- 1/8" & length is 5/8".

Outside Mount: Outside mount on your wall or molding can hide imperfection by covering edges of unsymmetrical windows and eliminates the 1/4" gap around the shade which results from an inside mount. It makes your window appear larger and provides a more open view. Provide measurements of the exact area you want to cover, including any overlap on the surrounding wall. All measurements should be rounded down to the nearest 1/8 inch. Note: You must add at least 2 inches above the window to allow space for mounting brackets.

Inside Mount: Measure width (from left to right) at inside top, center and bottom of window opening with a steel measuring tape. Use the narrowest width measurement (round down to the nearest 1/8 inch). Measure height (from top to bottom) at inside left, center and right of window opening. Use the shortest length measurement (round down to the nearest 1/8 inch). If your window is considerably out of square, consider Outside Mounting to conceal the irregularity.
 
For Woven Woods (Wood & Faux Wood) - The manufacturer will automatically deduct 1/2" for Finished Width & 1/2" deduction for the Finished Length.
For 2" Horizontal Blinds (Wood & Faux Wood) - The manufacturer will automatically deduct 3/8" for Finished Width & 0" deduction for the Finished Length.
 
PLEASE DO NOT TAKE ANY DEDUCTIONS IN YOUR INSIDE MOUNT MEASUREMENTS.
 

Important: For operating clearances, it is necessary to make inside mount shades 1/2 inch narrower than the inside window measurement (1/2 inch for each side). We will then make the shades with appropriate deduction for the inside mount. NOTE: Min. 2 to 2 1/2 inch window depth opening is required for inside mount.

Please Remember - "1/8” Accuracy" to your Measurements Window measurements must be accurate within 1/8". With outside mounts, round your measurements up or down to the nearest 1/8". With inside mounts, always round down to the nearest 1/8". Rounding up could result in a blind/shade that is too wide to fit within the window opening.