Getting Started
Accurate measurements are essential for perfectly fitting blinds. Whether you're installing inside or outside your window frame, following these steps will ensure you get precise measurements every time. Allow yourself 10-15 minutes per window for best results.
Pro Tip
Always measure in three places (top, middle, bottom for width; left, center, right for height) and use the smallest measurement. This accounts for any irregularities in your window frame.
Tools You'll Need
Metal Tape Measure
At least 8 feet long
Notepad & Pencil
To record measurements
Step Ladder
For reaching high windows
Helper (Optional)
Makes measuring easier
Measurement points for inside mount installation
Measure the Width
Measure the inside width of your window frame at the top, middle, and bottom. Record all three measurements. The smallest measurement is the one you'll use to ensure your blind fits properly. For outside mount, measure the area you want to cover and add 2-3 inches on each side.
Example Measurements:
- • Top: 36.25 inches
- • Middle: 36.125 inches
- • Bottom: 36.375 inches
- Use: 36.125 inches (smallest)
Measure the Height
Measure from the top of the window frame to the sill at the left side, center, and right side. Again, record all three measurements and use the smallest one. For outside mount, measure from where you want the blind to start to where you want it to end, typically 2-3 inches above and below the window frame.
Record & Verify
Write down your final width and height measurements clearly. Double-check your numbers and verify you're using the smallest measurements. Label each measurement with the room and window location (e.g., "Master Bedroom - Left Window"). This prevents confusion if you're measuring multiple windows.
Common Mistakes to Avoid
- ✗Using a cloth tape measure instead of a metal one (cloth can stretch)
- ✗Measuring only once instead of three times per dimension
- ✗Rounding up measurements instead of using exact decimals
- ✗Forgetting to account for window frame obstructions
- ✗Not checking if the window frame is square and level
