Special Measurement Considerations

French Doors, Arched Windows, Bay Windows, Etc.

French doors:
The wider and taller you specify your product, the better your privacy, insulation, and light control. You also need room (2" to 3-1/2") for the mounting brackets at the top, and the optional hold-down brackets (about 2") at the bottom. Consider mounting the window treatment a bit higher than you’d think so when the blind is raised it blocks less of your view. Add at least 3" at the top.

For the width, add at least an inch or two on both sides of the glass. Usually the deadbolt latch, however, will constrain the width you’d prefer. The product will usually fall just inside the deadbolt. In the case of a lever handle, certain products will slip between the handle and the door.

All products will work on either a wood or metal door. For metal doors, you’ll probably need "metal screws" designed for attaching to metal doors, which are normally hollow.

Measuring for a Window with Trim or Molding:
If you are using an outside mount and your window has trim, you should measure from the far left side of the trim to the far right side of the trim (so as to cover all trim from the start of one side to the end of the other). Give that measurement as your width. If you would like for your window trim to show, then give us the measurement of the window opening. If you want some trim covered but not all, add that amount to the width and be sure to add for both sides (exmaple - you want to cover 2" of trim, so you would take the window opening width, and add 4 inches (2 inches of trim to cover x 2 sides). For the height, measure from the top of the trim to the bottom of the trim or sill. If you wish to mount above the trim, measure starting 2” above the molding to the bottom of the trim or sill, and that will be your height.

Tile and wood obstructions:
Sometimes tile or trim wrap around into the window, usually several inches up from the bottom. This is common near kitchen sinks (back-splashes) and bathtubs. Most products can be cut by the manufacturers on the products’ sides to accommodate this. There is a slight surcharge depending on the product and whether the cutout is on one or both sides.

Window cranks:
Measure so that your product hangs in front of the crank. Consider adding an inch or so to mitigate the slight bulge the product will make as it hangs in front of the crank. Also, the crank can usually be removed or re-positioned to point upwards, which minimizes its projection and obstruction. You may also be able to find a crank replacement device that looks like a wing-nut, and has a tiny projection.

Sliding Doors:
Verticals can be specified to mount either within the door frame or over it on the wall. When determining this, consider whether the handle is an obstruction, and the amount of depth available. There is sometimes molding or trim near the baseboard which may have to be removed, or at least taken into consideration when determining width. For an outside mount it is normally sufficient to measure about 4 inches wider on both sides. The wider you specify, the better your privacy, insulation, and light control. For the height, specify about 3 to 5 inches above the top of the frame. A typical height for a vertical is 84"; however, whatever you prefer is fine. Blinds and shades can be specified as two-on-one headrail. This allows you to raise one while leaving the second one lowered. There is a surcharge for this. You can just order separate products.


First, measure the base width inside the arch opening.

Then measure the height at the middle (tallest) point inside of the arch opening

Other suggestions: Keep in mind that if you are ordering an arch, the height of your arch must be half the width. You will have a perfect semi-circle. If your window arch is not perfect, please call a representative to discuss your options (1-800-575-8016).

Windows without a top (arched/angled top):
There is no special measuring required, but you’ll need to ask for side-mount brackets.

Shallow sill depth:
See our charts regarding the manufacturer’s minimum sill depths required to fasten the brackets, and the minimum depth necessary for a flush mount (where the product does not protrude into the room. It has been our experience, however, that only 5/8" to 3/4" is all that is necessary to securely anchor most brackets; you’ll need to angle the screw back towards the glass and occasionally add one extra bracket. American Blinds will not be responsible for products which are not within the manufacturers’ specifications. Give us a call, or email for further explanation.

Corner windows:
When two outside mount verticals meet in a corner, or when other inside mount products meet in a corner where there is only glass (no sheet rock), there can be a privacy problem. That's due to a gap where the products "meet". In order to minimize the problem, consider making one product bypass the other, then specify the other product to butt into the first. (See illustration below.)


Bay Windows:
You will need poster board to help you correctly assess the measurements for your bay windows. First determine the depth of the product you are mounting and use this for the width of your poster board. You can obtain this depth on product pages or through customer service at 1-800-575-8016.

Next cut out two pieces of poster board that are the width of the product depth by 12" long. If extra clearance requires the use of extension brackets or spacer blocks, include the extra clearance to the width dimension of the poster board.

Place the strips you have cut as shown below. Position strip "A" in the left angle first, then bring together strips "A" and "B" until the front corners of the poster board meet. This will give you the correct angle. Mark points "A" and "B". Repeat for strips "C" and "D".

Measure from the left corner of "B" to the right corner of "C" to determine the width measurement of the center window treatment. Measure from the right corner of "A" outward to the desired width to determine the width measurement of the left window treatment. Measure from the left corner of "D" outward to the desired width to determine the width measurement of the right window treatment.

The height of the window treatments are determined by standard horizontal blind guidelines.

Bay Window Image