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All of our products are custom fabricated according to the dimensions given on your order. Measurements must be exact to ensure a proper fit. Ace of Shades and the fabricator will not be held accountable for incorrect measurements.

Standard measuring procedures apply to all products that fit rectangular windows unless otherwise specified. Careful attention must be given to each measurement; measurements that pertain to the mounting areas (headrails) are critical and must be accurate. Specialty shapes and applications require special measuring procedures. Some are outlined in these pages; however, when in doubt, please contact us or have a professional installer measure for a trouble-free installation!

·         Do always measure the exact window intended for the treatment. Each window opening is unique!

·         Do always use a 3/4" or 1" steel tape measure

·         Do measure the width and write it down; then measure the height and write it down

·         Do measure to the nearest 1/8".*

·         Don't assume a window is square.

·         Don't take any deductions. Factory deductions will vary based on product and mounting selection. Please refer to individual product specifications or contact us for more information.


Inside (IB) Mount – Shade fits within window frame

Outside (OB) Mount – Shade overlaps window opening. Be sure to add the desired overlap amount to each side and then add to the total ordered width when ordering an Outside Mount shade. Additional overlap has to be added when shade’s (fabric) finished dimension is less than ordered width. 

End (EB) Mount – Shade is mounted at the top left and right side corners.

      Inside MountOutside Mount


Inside (IB) Mount

1.      Be sure the window opening is deep enough to install the mounting bracket. Refer to our Mounting Requirements Chart for recessed mounting depths for each product.

2.      Measure the width inside the window opening at the top, middle and bottom. The top measurement is critical because the headrail must fit! The top measurement should always be the ordered width. Vertical applications require a top measurement only; middle and bottom measurements are not required.

3.      Measure the height inside the window opening at the left, right and center.

4.      Measure the window on the diagonal. If the two diagonal dimensions are not exactly the same, it may be necessary to specify an outside mount for optimal light control and privacy.

5.      The ordered width should ensure a precise fit for the headrail and allow proper operation of the shade. If widths in the window vary, order the minimum width if necessary to allow the shade to go up and down.

6.      The ordered height should ensure clean operation at the base of the window as well as provide maximum privacy and light control. If heights in the window vary, order the shortest height for vertical treatments and the longest height for horizontal treatments

IB Mount Horizontal Blinds
IB Mount Vertical Blinds

Outside (OB) Mount

1.      Measure the desired width and height. To minimize light leakage, the shade should overlap the window opening at least 2" on each side and at the bottom. When trying to cover a specific area in width, finished shade dimension should be taken into account. (Finished dimensions can be found in the mounting requirements section for the specific product.)

2.      When measuring the height, take into account the requirements for mounting the bracket attachment.


Outside Mount


1.      Measure the overall width. Use the narrowest measurement with inside mounts. With outside mounts, we recommend 3" overlap on all sides.

2.      Without moving the tape, measure the location of the desired split (usually a vertical mullion).

3.      Enter all measurements on the order form – overall width, left panel width, center panel width (if required), right panel width, and height.

4.      All panel widths combined must equal the overall width.

5.      The smaller panel must be at least 1/3 the size of the larger panel (Silhouette® and Nantucket™ shadings only). 

Measuring 3 on 1 Headrail 


For a window opening that is to be fully uncovered when the treatment is drawn open.

For outside-mounted treatments.

1.      Measure the desired Uncovered Width, rounding your measurement down to the nearest 1/8". With side stack units, include the desired amount of overlap for the side opposite the fabric stack in this measurement. Refer to product specifications for recommended overlaps, also taking into consideration trim or molding.

2.      Using the stackback charts created for the product in each product section, locate the Uncovered Width (clear opening) measurement under Split Stack or Side Stack design.

3.      Find the corresponding "Stackback" for that range.

4.      Add the Stackback to the Uncovered Width to get the correct width to order.

5.      After determining the correct width to order, confirm that there is enough room to outside mount the treatment on the opening at that width.



A cut-out is a shade with a small rectangular area removed from it to avoid obstructions, usually from one of the corners or from the bottom. Not all products allow cut-outs. Refer to the specific product section to verify availability.

Measure a cut-out like a standard rectangular shade, but also provide detailed measurements of the area to be removed. In addition, mark your measurements on a sketch of the cut-out to ensure accurate communication of the order.



Butt and Bypass Shades
When two shades butt against each other at a corner, as shown in the overhead views at right, one shade is the "butt" shade and the other is the "bypass" shade. Measure each shade separately using the procedures just described, and then subtract headrail depth from the butt shade to obtain the proper ordering width. With outside mounts, remember to allow for overlap on the sides and at the bottom


When not using Butt and Bypass
Some window treatments such as Shangri-La Sheers cannot use the Butt and Bypass. They are then measured to meet in the corner .

1.      Measure the width of both openings to the common corner.

2.      Deduct the necessary depth of the treatment from the width of each measurement so they will meet in the corner but not overlap. Important: If spacer blocks or extension brackets will be used for extra clearance on outside mounts, add the amount of extra clearance to the deduction.

3.      Order the width less the deduction for each window.

Corner Windows


With bay windows, location of the window treatment and the ordered width are marked and measured as illustrated below.

1.      Determine the depth of the product you are mounting and use this for the width of your poster board.

2.      Cut two pieces of poster board (depth determined from #1 above) wide by 12" long. Important: If spacer blocks or extension brackets will be used for extra clearance on outside mounts, add the amount of extra clearance to the width dimension of the poster board before measuring.

3.      Place the strips in the left angle first and bring them together until the front corners of the poster board meet. Mark points "A" and "B".

4.      Repeat this step for the right side angle, marking points "C" and "D".

5.      Measure between points "B" and "C" to obtain the width measurement of the center window treatment.

6.      Measure from point "A" outward to the desired width to obtain the width measurement of the left window treatment.

7.      Measure from point "D" outward to the desired width to obtain the width measurement of the right window treatment.

8.    Take finished headrail dimensions into consideration. (Can be found on product detail page.)

Bay Windows


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