Choose Inside or Outside Mount:
Before taking any measurements, step back from your window and decide if you want to mount the window treatment inside the window recess or outside on the wall or molding. For an inside mount, the window opening must have enough unobstructed depth to allow mounting. Be sure to look for obstructions like window locks, window cranks, or other objects that may be in the way.
Tip: For a flush inside mount (the blind completely recessed so that no part of the blind projects out of the opening) check that you have enough depth and make sure that if a valance is included that we make it slightly smaller than the window opening width since they are normally made an inch or two wider.
Tip: We usually recommend an inside mount whenever possible because it provides a cleaner look. However, an outside mount can make a window appear larger or hide an unattractive window. When you specify inside mount, we will make a size deduction to allow for operating clearance. We will deduct up to 1/4" from each side (on vertical blinds there is also a height deduction of 1/4"). The deductions are made so that the blind will not rub or scratch your window frame. If you specify an outside mount, we will not take any size deductions. Your blind will be made at the exact size you specify. So you must ADD to the opening measurement to allow for overlap and mounting brackets. When measuring, don't be surprised if your windows are not square. It's not uncommon and probably won't be noticeable.
For doors (outside mount)
Measuring for doors is a little different. Since the blind will not fit inside the window frame you have the freedom of deciding how wide and how long you want it. Typically, a few inches wider than the window is fine for the width. The headrail ocupies about 2-1/4" of space and the bottom rail with hold-downs occupies about 1" so add 2-1/4" to the length for an exact fit. Also, make sure that the blind will not interfere with the door handle. All of our blinds come with a wood valance and hold down brackets so the blind will not bounce off the door when you open and close it. | 
