Buying shades or curtains for your room or home is an important step in creating the ideal atmosphere and functionality in your space. But before you begin selecting the perfect style, fabric, or color, there’s one crucial task you must tackle—accurately measuring your windows. Though it might seem like a simple task requiring just a tape measure, getting the measurements right is essential for a flawless fit. Here’s how you can measure your windows accurately to ensure your shades or curtains will hang beautifully and function perfectly.

Why Accurate Measurement Matters

Getting your measurements right is vital for both the look and functionality of your window coverings. If the measurements are off—even by a small amount—it can lead to issues with fitting, light leakage, or an uneven appearance. Whether you’re installing shades, curtains, or blinds, proper measurements will help you avoid unnecessary hassle during installation and ensure a perfect finish every time. A few extra minutes spent measuring carefully can save you time, money, and frustration later.

Step-by-Step Guide to Accurate Window Measurements

1. Measure the Width and Height from Multiple Points

When measuring for shades or curtains, always measure the inside frame dimensions of the window. This means measuring from edge to edge of the window frame, not the trim around it. Take measurements at three different points: one at the top, one in the middle, and one at the bottom, both for width and height. Why measure in multiple places? It’s important because windows are rarely perfectly square, especially in older homes. Measuring at different points ensures you get the most accurate, consistent measurements, and allows for any slight variations in the window frame.

· For the width: Measure from left to right at the top, middle, and bottom of the window frame.

· For the height: Measure from top to bottom at both the left, center, and right sides of the window.

Once you’ve measured these points, use the smallest measurement to determine your shade or curtain size. This ensures a proper, snug fit within the window frame, compensating for any inconsistencies in the window’s shape or size.

2. Account for Window Frame Discrepancies

During construction, windows are often framed by hand, and slight variations are almost always present. In fact, some windows may have discrepancies large enough to make a significant difference in the fit of your window treatments. For instance, the width or height of the window might vary by a few millimeters from top to bottom or from left to right. Because of these potential discrepancies, it’s crucial to use the smallest measurement when ordering your shades or curtains.

Interior Mount vs. Exterior Mount: What’s the Difference?

Once you’ve taken accurate measurements, it’s time to decide whether you want to install your shades or curtains inside or outside the window frame. Each mounting option provides different benefits depending on the look and function you desire.

Interior Mount (Inside the Frame)

An interior mount means installing the shades or curtains directly inside the window frame, flush against the glass. This option is ideal if you want a clean, streamlined look and to showcase the window trim.

· Width: After measuring the width from edge to edge of the frame, subtract 3/8 inches (approximately 10mm). This slight reduction allows for a small gap between the shade and the frame, ensuring that your shade or curtain fits perfectly, even with slight variations during manufacturing. The height does not need to be adjusted.

· Why this matters: When measuring edge-to-edge, you’re taking precise measurements that might be a little too tight for installation. By deducting this small amount, you ensure that the shades or curtains can be easily installed without getting stuck or causing damage to the frame. This adjustment compensates for the small discrepancies that naturally occur during the manufacturing process.

Exterior Mount (Outside the Frame)

An exterior mount involves installing the shades or curtains outside the window frame, usually covering the entire frame and part of the wall around it. This mounting style is perfect for those who want to create a more dramatic look and need better light control.

· Width: After measuring from edge to edge of the window, you’ll need to add 4-8 inches to both sides. This extra width ensures that the shades or curtains cover the window frame completely and provide maximum light-blocking.

· Height: Similarly, you should also add 4-8 inches to the top and bottom measurements to fully cover the window frame and provide optimal light coverage when the shades are pulled down.

· Why this matters: An exterior mount is often chosen for its ability to block more light, create a bolder appearance, or cover unsightly window trim. By adding extra inches, you’re ensuring that the window treatments will fully overlap the frame, giving you complete control over light and privacy while adding a polished, finished look.

Additional Tips for Perfect Measurements:

· Use a Steel Tape Measure: For the most precise measurements, use a steel tape measure. Cloth or plastic tape measures can stretch or bend, leading to inaccurate readings.

· Double-Check Your Numbers: Always double-check your measurements before placing an order. It’s better to measure twice and be sure than to face the hassle of returns or adjustments later.

· Consider the Mounting Hardware: Remember that if you’re using hardware to install your shades or curtains (brackets, hooks, rods, etc.), you may need to account for additional space when determining your measurements, especially for exterior mounts.

By following these steps and ensuring accurate measurements, you’ll be well on your way to finding the perfect shades or curtains that fit your windows beautifully, both in size and style.