How to Measure Your Windows for Custom Window Treatments

Accurate measurements are the foundation of perfectly fitting custom window treatments. Whether you're planning to install new blinds, shades, or drapes, taking the time to measure correctly ensures your investment looks professional and functions flawlessly.

Essential Tools for Measuring

Before you begin, gather a metal measuring tape, a pencil, and a notepad. Metal tape measures are more reliable than cloth versions because they won't stretch or distort your measurements. Take multiple measurements of each window and record every detail—these specifics guide the craftsmanship of your custom treatments.

Step-by-Step Measurement Process

Start by measuring the width of your window in three places: the top, middle, and bottom. Window frames can shift over time, so these measurements may vary slightly. Record all three numbers. Next, measure the height at both the left and right sides, and again in the center. Use the smallest width and height measurements as your baseline unless you're installing custom treatments inside the frame, in which case record exact inner dimensions.

For treatments that mount outside the frame, measure the wall space where you want them installed. Note the distance from the window edges to where you'd like the treatment to begin. This determines how much privacy and light control you'll achieve.

Room-Specific Considerations

Different rooms require different approaches. In bedrooms, many homeowners prefer treatments that extend beyond the frame to block more light. Living rooms might benefit from treatments positioned to frame the window without extending too far. Bathrooms require consideration of moisture and ventilation.

Measure obstacles around windows—radiators, shelves, furniture, and architectural features all influence where treatments can be positioned. Document these details so they're factored into your custom design.

Common Measuring Mistakes to Avoid

• Measuring only once per dimension—variations catch errors
• Ignoring window frame protrusions that affect installation
• Forgetting to account for wall switches and outlets nearby
• Assuming all windows are symmetrical—they often aren't

Take photos of your windows from multiple angles. These images provide helpful reference points when discussing your project. Professional installers appreciate comprehensive information—it leads to custom treatments that exceed your expectations.