Measuring Windows for Inside Mount Blinds: A Comprehensive Guide
Installing blinds on the inside of your window frame, also known as inside mount, can enhance your room's aesthetics and provide better light control. However, accurate measurement is crucial for a perfect fit. This guide will walk you through the process of measuring windows for inside mount blinds, ensuring a professional and seamless result.
Understanding Inside Mount Blinds
Inside mount blinds are installed within the window frame, offering a clean, streamlined look. They are ideal for windows with limited space, such as those in bathrooms or kitchens. They also provide better privacy and light control as the blind covers the entire window area.
Tools You'll Need
- A measuring tape
- A pen and paper
- A level
- A calculator
Step-by-Step Measurement Guide
Step 1: Determine the Blind Type
Before measuring, decide on the type of blind you want. The measurement process may vary slightly depending on whether you choose roller, Roman, or vertical blinds.

Step 2: Measure the Width
For inside mount blinds, you'll need to measure the width of the window frame, not the glass. Use a measuring tape to record the width from one side of the frame to the other. Make sure to measure at the top, middle, and bottom of the window to account for any variations. Use the narrowest measurement for your blinds.
Step 3: Measure the Drop
Next, measure the drop, or height, of the window. Again, measure at the left, center, and right sides, and use the shortest measurement to ensure your blinds will fit properly. Remember to measure from the top of the window frame to the sill.
Step 4: Account for Headroom and Stacking Space
Depending on the type of blind you've chosen, you may need to add extra inches to your drop measurement. For example, roller blinds typically need an extra 2-3 inches at the top for the headrail, while Roman blinds may need 3-4 inches for the header. Also, consider the space needed for the blind to stack when it's fully raised.

Step 5: Double-Check Your Measurements
Before ordering your blinds, double-check your measurements. It's always a good idea to round down to the nearest 1/8 inch to ensure a snug fit. Also, re-measure your window to confirm your measurements are accurate.
Common Measurement Mistakes to Avoid
| Mistake | Why It's a Problem |
|---|---|
| Measuring the glass instead of the frame | Inside mount blinds need to fit within the frame, so measuring the glass will result in blinds that are too large. |
| Not accounting for headroom and stacking space | Without adequate space, your blinds may not function properly or could damage the window frame. |
| Not measuring at multiple points | Windows are not always perfectly square. Measuring at multiple points helps ensure a proper fit. |
Professional Installation Tips
If you're unsure about measuring or installing your blinds, consider hiring a professional. They have the tools and expertise to ensure a perfect fit and smooth installation. Additionally, many blind manufacturers offer professional installation services.
In the world of window treatments, accuracy is key. By following this comprehensive guide, you'll be well on your way to installing inside mount blinds that fit perfectly and enhance your space. Happy measuring!






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