How-To

How to Measure for Blinds: Inside vs. Outside Mount

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.

Inside mount diagram: the blind fits neatly inside the window frame; measure the exact opening width
Inside mount sits inside the frame for a clean, built-in look. Measure the exact window opening, no deductions.
Outside mount diagram: the blind mounts on the wall above and overlaps the window frame on each side
Outside mount attaches above the window and overlaps the frame, great for hiding trim, adding privacy, or shallow windows.

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.

Get your free quote

Tell us a little about your project and we’ll follow up with honest pricing and free installation. Serving Houston and the surrounding suburbs.

Free InstallationFree In-Home EstimatesHunter Douglas DealerLifetime Limited WarrantyUSA-Made ProductsChild-Safe Cordless OptionsFamily-Owned, 30+ Years

Request Your Free Estimate

Prefer to talk? Call or text (832) 772-7137.

Frequently Asked Questions

Do I need to deduct anything when measuring for inside mount blinds?

No, you should record the exact window opening dimensions. The manufacturer will make the necessary deductions to ensure your blinds operate smoothly inside the frame.

Can I put inside mount blinds on my new construction windows?

Yes, as long as the window frame has enough depth. We frequently work with builders throughout Greater Houston to ensure new construction windows are ready for beautiful, child-safe cordless treatments.

What if my windows are slightly uneven?

It’s very common for windows to be out of square. Taking measurements in three places and using the narrowest width and longest height ensures your custom blinds will still fit and function perfectly.

Call NowFree Estimate