Minimum mount refers the smallest window frame depth in which the blinds can be installed in the window. This depth allows the brackets to be installed with enough depth for the screws to hold in place.
With minimum mounting depth the window blinds will extend past the front edge of the window frame and the sides of the blinds will be visible or at least a portion of the sides. With flush mount blinds, the window blinds are completely within the window frame.
If your window frame is less than the minimum mounting depth required you will need to use an outside mount. This means you will need a window blind slightly larger than the window and will mount the blinds on the wall above the window.
Review the minimum mounting depth as well as the flush mount depth when selecting a window blind to ensure proper fit. Buy your window blinds today!
Want a deeper explanation? Read our guide to Flush Mount vs. Protruding Mount Blinds and Shades. Need help measuring?
Related Guide: Common Measuring Mistakes When Ordering Window Blinds and Shades
What Happens If My Window Is Too Shallow for a Flush Mount?
A shallow window doesn't automatically rule out an inside mount. If your opening meets the product's minimum mounting depth but falls short of its flush mounting depth, the blind or shade can still be installed inside the frame. The difference is that part of it will sit in front of the opening instead of fully inside it.
What you'll see is the front of the headrail, cassette or valance projecting past the face of the window frame. How much sticks out is the gap between the product's flush depth and the depth you actually have. A window that is 1/2" short of flush means about 1/2" of the treatment extends out into the room.
For many homes, that's a fair trade for keeping the built-in look of an inside mount. Consider these points when you decide:
- The treatment will still be mounted securely. The minimum depth is what gives the brackets enough room to hold.
- The projecting portion may be more noticeable on wide windows or on products with a larger headrail.
- If your opening is shallower than the minimum depth, an inside mount isn't recommended. An outside mount is the better choice, where the treatment goes on the wall or trim above the window.
Not sure which side of the line your window falls on? Our design team can look at your measurements before you order. Contact us and we'll help you choose.
Where Do I Find the Required Depth?
Check the specifications for the exact product you're considering. There is no single number that applies to every blind or shade, because the required depth depends on how the product is built. Headrail size, lift type (cordless, corded or motorized), and whether it has a cassette, valance or fascia all change the space it needs.
Every product page on Blinds Chalet lists two measurements in the specs:
- Minimum mounting depth is the least depth needed to install the product inside the frame.
- Flush mounting depth is the depth needed for the entire product to sit completely inside the frame, with nothing extending past the front edge.
Compare both numbers to the depth of your window opening. Measure from the front edge of the frame to the first obstruction, such as a window crank, lock, handle or the glass itself, and use the smallest measurement you find. Because options like a valance or a different lift system can change the requirements, recheck the specs after you choose your options.
Need a hand with measuring? Our how to measure for blinds and shades instructions walk through it step by step. If your window has limited mounting depth, see our shallow mount measuring instructions to learn how to measure accurately and determine whether an inside mount will work.
