When mounting window blinds, how much window frame depth do I need? What is a flush mount blind and a protruding mount blind? What should I do if I have a shallow window sill? These are some common questions asked when choosing window blinds.

When measuring for window blinds you should always make sure you have enough depth in your windows to mount the blinds. Each blind has specifications needed to mount them. A typical 2 inch window blind needs a minimum of an inch and a half but at least 3 inches for a flush mount. A flush mount blind is on that is completely recessed in the window frame and nothing is protruding out of the window frame.

If your window frame is not deep enough for a flush mount blind you have two choices.

Protruding Mount Blinds

First, if your window frame has a depth between the minimum flush depth and the minimum depth you can still mount them inside the window frame. Part of the blind will extend past the front edge of the wall and the sides of the slats will be visible. This is called a protruding mount blind. You might want to consider ordering a custom valance with short returns to cover the sides of the headrail and brackets. At Blinds Chalet we can custom make the returns on a valance at any length.

Outside Mount Blinds

A second alternative is to use an outside mount blind. Outside mount blinds are mounted on the wall outside the window frame. Read our measuring instructions for complete details.


Blinds Chalet has more than 25 years of experience selling and installing flush mount or protruding mount blinds. Attractive, high quality window blinds that fit any energy saving plan, decorating style, and budget. For information on what types of window blinds, blind accessories, and any other window covering needs, visit www.blindschalet.com.
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