How to Measure Your Windows for Perfectly Fitted Curtains and Blinds

When it comes to transforming your living space, few elements make as significant an impact as well-chosen window treatments. Whether you’re looking to add a touch of elegance, ensure privacy, or enhance energy efficiency, custom made curtains and blinds can be the perfect solution. To achieve the ideal fit and look, accurate measurements are crucial. This comprehensive guide will walk you through the steps to measure your windows correctly, ensuring your custom made curtains and blinds fit perfectly and elevate your home’s aesthetic.

Why Accurate Measurements Matter

Accurate measurements are the foundation of well-fitted custom made curtains and blinds. Incorrect measurements can lead to gaps, inadequate coverage, or an awkward appearance, negating the benefits of having custom window treatments. Precise measurements ensure that your curtains and blinds will:

  • Fit snugly within the window frame.
  • Provide optimal light control and privacy.
  • Enhance the overall appearance of the room.

Tools You’ll Need

Before you start measuring, grab the necessary tools:

  • A steel measuring tape (cloth tapes can stretch and give inaccurate readings).
  • A pencil and notepad to record measurements.
  • A step stool or ladder for hard-to-reach windows.
  • A level (optional but useful for checking straight lines).

Step-by-Step Guide to Measuring Windows

1. Decide on Mounting Style: Inside Mount vs. Outside Mount

The first decision to make is whether you want an inside mount or an outside mount for your curtains or blinds.

Inside Mount:

  • Fits within the window frame.
  • Provides a clean, streamlined look.
  • Requires precise measurements to fit snugly.

Outside Mount:

  • Mounted outside the window frame, covering the entire window and sometimes more.
  • Can make windows appear larger and block more light.
  • More forgiving with measurements but still requires accuracy.
2. Measuring for Inside Mount

If you’ve chosen an inside mount, follow these steps:


  • Measure the width of the window at the top, center, and bottom. Windows are rarely perfectly uniform, so take all three measurements.
  • Record the narrowest width to ensure the blinds will fit within the frame.


  • Measure the window’s height on the left, center, and right sides.
  • Record the longest height to ensure full coverage.


  • Measure the depth of the window frame to ensure it can accommodate the mounting hardware. This is especially important for blinds, as they require a certain depth to fit properly.
3. Measuring for Outside Mount

For an outside mount, the process is slightly different:


  • Measure the breadth of the area you wish to cover.It’s typically recommended to add 3-6 inches on each side of the window to ensure full coverage and minimize light gaps.


  • Measure from the top of where you want your curtains or blinds to start (often above the window frame) to where you want them to end (usually below the window frame or to the floor).

Note: For both mounting styles, it’s essential to double-check your measurements. Accuracy is key, so take your time and measure twice to avoid mistakes.

4. Special Considerations

Bay Windows:

  • For bay windows, measure each section individually as per the steps above. Note any angles or irregularities and consider consulting a professional for complex installations.

Patio Doors:

  • Measure the full height and width of the door. Ensure you account for any handles or obstructions.

French Doors:

  • Measure the width and height of the glass area, adding a few extra inches for optimal coverage.

Common Mistakes to Avoid

To ensure your custom made curtains and blinds fit perfectly, avoid these common mistakes:

  • Using a Cloth Tape: Cloth tapes can stretch and provide inaccurate measurements. Always use a steel tape measure.
  • Rounding Off Measurements: Precision is crucial. Measure to the closest 1/8 inch.
  • Not Measuring Multiple Points: Always measure the width and height at several points to account for any variations.
  • Ignoring Obstacles: Consider window handles, locks, and other obstacles that might interfere with the installation.

Final Tips for Success

  • Consult Manufacturer Guidelines: Different manufacturers may have specific measurement requirements. Always check their guidelines before measuring.
  • Seek Professional Help if Needed: If you’re unsure about your measurements or have a particularly tricky window setup, consider hiring a professional to measure for you.
  • Order Samples First: If possible, order fabric or material samples to see how they look in your space and ensure they match your décor.


Accurate measurements are the cornerstone of well-fitted custom made curtains and blinds. By following these steps, you can ensure that your window treatments not only look stunning but also function perfectly, providing you with the privacy, light control, and aesthetic appeal you desire. With the right tools, careful measurement, and attention to detail, your custom made curtains and blinds will be a beautiful and functional addition to your home, enhancing its overall design and comfort.

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