How to Measure for Vertical Blinds Blinds come in different types, such as roller, Venetian, Roman, and vertical blinds. Accurate measurement is crucial for a perfect fit. A. Choosing Inside Mount vs. Outside Mount ✔ Inside Mount (Fits inside the window frame) Gives a sleek, built-in look. Requires enough depth in the frame to accommodate the blinds. ✔ Outside Mount (Mounted outside the window frame) Covers the entire window and prevents light gaps. Ideal for windows with limited depth. B. Measuring for Inside Mount Blinds Width Measurement Measure inside the window frame at the top, middle, and bottom. Record the smallest width to ensure a perfect fit. Height Measurement Measure from the top inside frame to the bottom inside frame at the left, middle, and right. Use the largest height measurement. Depth Measurement Measure the depth of the window to ensure enough space for the blinds to fit properly.