How to Measure for Blinds: Inside vs. Outside Mount
Measuring for new window treatments can feel intimidating, but getting it right is crucial for a perfect fit. At Stanly Blinds, we have spent over thirty years helping families across Greater Houston find their ideal shades. While this guide walks you through the basics, remember we offer free in home estimates so you never have to risk a mismeasurement.
Inside Mount vs. Outside Mount Blinds
An inside mount fits neatly within the window frame, offering a clean and built-in look that highlights your home’s trim. An outside mount attaches to the wall or molding above the window, which is excellent for hiding unattractive frames or making a window appear larger. Your choice changes how you measure, so decide on your preferred style first. Outside mounts are also the best solution if your window lacks the depth for an inside mount.
How to Measure for Inside Mount Blinds
Always measure the exact width of the window opening in three places: the top, middle, and bottom. Use the narrowest of these three measurements to ensure the blind will fit without scraping the sides. Next, measure the height in three places: left, center, and right, and use the longest measurement. Do not make any deductions yourself, as the manufacturer handles that to ensure smooth operation.
Minimum Window Depth for Inside Mount
To use an inside mount, your window frame needs a specific depth to house the headrail securely. Most Hunter Douglas products require a minimum depth of one to three inches, depending on the specific style you choose. Flush mounts, where the blind sits entirely inside the frame, naturally require even more depth. If your Houston home has shallow windows, we can recommend beautiful outside mount alternatives.
Common Measuring Mistakes to Avoid
One of the biggest mistakes a homeowner makes is confusing width and height, so always measure width first. Another frequent error is rounding up measurements or assuming two windows in the same room are identical. Even windows installed by the same builder in Katy or The Woodlands can vary by a fraction of an inch. Always use a steel tape measure, as cloth tapes stretch and warp your numbers.
Let Us Measure for Free
Why risk ordering custom USA-made blinds with incorrect dimensions when you don’t have to? Stanly Blinds provides free in home estimates and free professional installation across Kingwood, Humble, Sugar Land, and surrounding areas. We bring the samples, take precise measurements, and handle everything from start to finish. Call us at (832) 772-7137 to schedule your complimentary visit today.
Ready for a free in-home estimate?
We’ll measure, recommend the right options for your home, and give you an honest quote, with free installation included. Already know your sizes? Order online and we’ll send a free quote within 24 to 48 hours.

How Much Do Blinds, Shutters & Shades Cost in Houston? (2026 Guide)
Blinds vs. Shades vs. Shutters: Which Is Right for Your Home?
Child-Safe & Cordless Window Coverings: What Parents Need to Know