Take 30% off on all window shades - Valid through 12/15 - No code needed

What Is The Minimum Depth For Window Blinds

There’s nothing worse than ordering custom blinds to find out that they don’t properly fit your window or don’t achieve the look you’re going for. An important step for choosing window treatments for your home is to check your window depth to ensure the right fit and proper function. 

Read on to learn ShadeMonster’s tips for measuring window depth for blinds before making your purchase. 

Why Does Depth Matter? 

There are specific window depth requirements for different mounts, brackets, and valances. If this is the first time you are purchasing custom made window blinds you might be unaware of the significance window depth has on the overall look and function of your window treatments. Sometimes window frame depth is too narrow for the blind or shade you want to install. Other times there is an obstacle to keep in mind, such as a window crank or door handle, that may hinder the function of your roller shades. These considerations will help you decide how to choose the right window treatment for your window. 

Sometimes these decisions are made for you based on the window depth. For example, if you desire a flush inside mount look but only have 3 inches of window depth, then you already know that a 5 inch valance would not fit. The maximum your window treatment bracket and valance could be in order to achieve a flush look would be 3 inches. 

If you are unsure of your window treatment options based on your window depth, please refer to our window depth requirement chart

Graphic of different mounting position options

What is the Minimum Depth for Inside Mount Blinds?

Inside mount blinds are mounted inside your window’s frame and provide a clean built-in look. This mount leaves your window frame exposed. The minimum depth for inside mount blinds is ¾ inches for non-flush blinds. However, to achieve a flush look the minimum depth for inside mount is 2 inches. 

Note: Solar and blackout shade fabric will be approximately 1 ⅜ inches narrower than your ordering width to compensate for the brackets and ensure proper function. If you are concerned with the resulting light gaps, consider outside mount or add side channels to your order to eliminate light seepage. 

Light gray blackout shades with matching color valance, installed on a window in a living room

How Shallow is Too Shallow for Inside Mount Blinds?

Inside mount blinds require a minimum of ¾” of window depth in order to install the brackets. If your window depth is larger than ¾”, your blinds will not be flush but can still be installed inside the window frame. If your shallow window depth is less than this, your blinds will have to be mounted outside the window frame in order to secure the brackets. Any less than ¾” will result in unsecure blinds that are at high risk of falling (if they can even be mounted at all).

What is the Minimum Depth for Outside Mount Blinds?

Outside mount blinds are mounted outside your window frame and provide a taller, more dramatic appearance. Your blinds will cover the window in its entirety. There is no minimum depth for outside mount blinds since they are not mounted within the window frame. 

Outside mount graphic: the measure needs to be at least for inches over the size of the window frame

Your shade fabric will be 1 3/4″ narrower than the measurement you provide to allow for brackets. If you need the material to cover a specific width (i.e. for mounting the shade on a door), add 1 3/4″ to the desired fabric width and this will be your ordering width.

For shades with upholstered valances, please note the valance will be 1″ wider than your ordering width.

White roller blinds installed outside mount with a white valance

When you’re ready to purchase custom-made window blinds or shades, remember that your window depth matters when measuring your windows. Keep these general rules in mind to achieve your desired look:

  • For a flush look, a minimum of 2″ is required for inside mount
  • Measure to the nearest 1/8 inch
  • Measure each window even if they look similar in size
  • Use a metal tape measure
  • Do not take deductions

Still need help? ShadeMonster can guide you through the process and answer any questions during measurement. Chat live or watch our quick video to see how it’s done.

Why Trust ShadeMonster with your Window Treatment?

ShadeMonster boasts over 25 years of full service experience in commercial and home window treatments. Our products come directly from our local factory guaranteeing high quality customizable materials, competitive pricing, and quick turn around. Contact us today for your free estimate, and have your new shades in less than 7 business days!

Still Need Help Deciding on a Window Treatment?

ShadeMonster’s team of experts are happy to assist. Call now for free consultation: 866-206-8056