How do I measure for electric window treatments?

May 22, 2026

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James Anderson
James Anderson
James is an R & D manager at Jiangsu Hengyu. He leads a team of engineers to continuously innovate and improve the company's products. With his leadership, the company has made significant progress in product technology since 2008.

Measuring for electric window treatments is a crucial step in ensuring a perfect fit and optimal functionality. As a supplier of electric window treatments, I understand the importance of accurate measurements. In this blog, I'll guide you through the process of measuring for electric window treatments, covering different types of windows and treatment styles.

Understanding the Basics of Measuring

Before you start measuring, it's essential to understand the two main types of measurements: inside mount and outside mount.

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  • Inside Mount: This involves installing the window treatment inside the window frame. It provides a clean, flush look and is ideal for windows with sufficient depth.
  • Outside Mount: This is when the window treatment is installed outside the window frame. It's a great option for windows with limited depth or when you want to block more light.

Measuring for Inside Mount

  1. Width Measurement
    • Use a metal tape measure for the most accurate results. Measure the width of the window frame at the top, middle, and bottom. Record the narrowest measurement. This is because the electric window treatment needs to fit snugly inside the frame.
    • For example, if the top width is 36 inches, the middle is 35.5 inches, and the bottom is 35 inches, you should use 35 inches as your width measurement.
  2. Height Measurement
    • Measure the height of the window frame from the top to the bottom at the left, middle, and right. Record the longest measurement. This ensures that the window treatment will cover the entire window.
    • Suppose the left height is 48 inches, the middle is 48.5 inches, and the right is 49 inches. You would use 49 inches as your height measurement.

Measuring for Outside Mount

  1. Width Measurement
    • Decide how much extra width you want the window treatment to cover on each side. A common recommendation is to add 3 - 6 inches on each side for a more substantial look and better light blockage.
    • Measure the width of the area where you want to install the window treatment. For example, if your window is 36 inches wide and you want to add 4 inches on each side, your total width measurement would be 36 + 4 + 4 = 44 inches.
  2. Height Measurement
    • Determine how far you want the window treatment to extend above and below the window. A typical amount is 2 - 4 inches above the window and 1 - 2 inches below.
    • Measure from the point above the window to the point below the window. If your window is 48 inches tall and you want to add 3 inches above and 1 inch below, your height measurement would be 48 + 3 + 1 = 52 inches.

Measuring Different Window Shapes

Not all windows are rectangular. Here's how to measure for some common non - rectangular window shapes:

Bay Windows

  • Inside Mount: Measure each section of the bay window separately. For each panel, measure the width and height as described for inside mount rectangular windows. Then, note the angles between the panels. Some electric window treatment systems can be customized to fit these angles.
  • Outside Mount: Measure the overall width and height of the bay window area. Consider adding extra width and height for a more complete coverage.

Circular or Oval Windows

  • Diameter or Major/Minor Axes: For circular windows, measure the diameter. For oval windows, measure the major and minor axes. These measurements will help in selecting a custom - made electric window treatment that fits the shape.

Measuring for Different Types of Electric Window Treatments

  1. Blinds
    • For horizontal blinds, the width and height measurements are crucial for a proper fit. Make sure to account for the slat size and the mechanism that controls the blinds.
    • Vertical blinds require accurate width measurements, especially if you want the slats to cover the window evenly.
  2. Shades
    • Roller shades need precise width and height measurements. The fabric should fit snugly inside or outside the window frame, depending on the mount type.
    • Roman shades also rely on accurate measurements to ensure a smooth and even appearance when raised and lowered.

Considerations for Installation

  • Clearance: Make sure there is enough clearance for the electric motor and any additional components. Check the product specifications for the minimum clearance requirements.
  • Obstructions: Look for any obstructions inside or outside the window frame, such as handles, locks, or molding. These can affect the installation and functionality of the electric window treatment.

Importance of Accurate Measurements

Accurate measurements are vital for several reasons:

  • Proper Fit: A well - measured window treatment will fit perfectly, enhancing the aesthetic appeal of your space.
  • Functionality: It ensures that the electric window treatment operates smoothly, without any jams or misalignments.
  • Light Control: Precise measurements help in achieving the desired level of light blockage or filtration.

Related Products and Links

If you're also interested in other ventilation products, we offer a range of high - quality items such as Hvac Duct Diffuser, Adjustable Louvre Vent, and Louvered Intake Vent. These products can complement your electric window treatments and improve the overall comfort of your space.

Contact for Purchase and Consultation

If you're ready to purchase electric window treatments or have any questions about the measuring process, feel free to reach out. We're here to assist you in finding the perfect window treatment solution for your needs. Our team of experts can provide further guidance and ensure that you get the best - fitting and highest - quality products.

References

  • "Window Treatment Measuring Guide" by a leading home improvement magazine.
  • Manufacturer's installation manuals for electric window treatments.
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