If you are looking to improve the look and functionality of your home, window treatments such as blinds and shades are key. Before buying, though, it's important to measure your windows accurately. This guide will explain the difference between inside and outside mounts, give you step-by-step measuring instructions, and share essential tips for getting the perfect fit.

Inside Mount vs. Outside Mount

Before you start measuring, it's important to decide whether you want an inside or outside mount for your window treatments. This choice will impact both the aesthetic and function of your window treatments. Let's break down the differences between the two:

Inside mount is a popular choice for installing window shades and blinds, as it offers a sleek, streamlined look by placing the treatments within the window frame itself. This option is particularly suitable for windows with enough recess depth to accommodate the mounting hardware, thereby ensuring a snug and aesthetically pleasing fit. Inside mount is ideal for windows that are framed by casings, providing a neat appearance that highlights the window’s architecture. It works well with a variety of window types, such as double-hung, single-hung, and casement windows, as long as there is sufficient depth and the frame is relatively square and even.

Outside mount involves installing the blinds or shades above the window frame, extending beyond the window edges. This option is great for windows that have shallow frame depths or when you want to make a window appear larger. By mounting the window coverings on the wall or ceiling around the window, outside mount is perfect for uniquely shaped windows, uneven frames, or when you need extra light control or privacy. It can be used effectively with various window types, including sliding glass doors, or bay windows, providing a bold and dramatic statement to enhance any room's decor.

How to Measure for Inside Mount Shades and Blinds

When measuring for inside mount shades and blinds, precision matters. Follow these easy steps to get it right:

Step 1: Gather Your Tools

• A steel measuring tape
• A pencil
• A piece of measuring worksheet for recording measurements

Step 2: Measure the Window Depth

You’ll need this measurement to ensure your window recess meets the minimum depth requirement for an inside mount. Different styles of window blinds and shades require specific depth measurements to fit correctly within the window frame. If the depth is not adequate, the blinds may not fit properly or may obstruct the window's operation.

Place your measuring tape at the front edge of the window opening and extend it straight back to the glass to find the window depth. Ensure you’re measuring the space where the brackets will be mounted, not including any obstructions. It's helpful to measure at different points — like the left, center, and right — since window frames can be uneven. Write down the smallest measurement you get. This will be the key depth you need for choosing the right blinds or shades.

Step 3: Measure the Window Width

• Measure the Inside Width: Use the tape measure to find the width of the window frame at three points: the top, middle, and bottom.
• Record the Narrowest Measurement: This ensures the blinds will fit properly within the frame.
• Make Adjustments (If Needed): Subtract 3/8 inch from your measurement when ordering to ensure your shades or blinds fit inside the frame properly.

Step 4: Measure the Window Height

• Measure the Inside Height: Measure from the top of the window frame to the window sill at three points: left, center, and right.
• Record the Longest Measurement: This will help you determine the correct height for your blinds or shades.

Step 5: Double Check All Measurements

Always recheck your measurements to account for any inconsistencies. Accurate measurements are critical for a perfect fit.

How to measure for Outside Mount Shades and Blinds

Measuring for outside mount shades and blinds is slightly different. Here’s how to do it:

Step 1: Gather Your Tools

• A steel measuring tape
• A pencil
• A piece of measuring worksheet for recording measurements

Step 2: Measure the Window Width

• Determine the Width: Measure the width from the left to the right side of the outer edge of the window frame or molding at three points: the top, middle, and bottom.
• Record the Longest Measurement: This will be your window width for outside mount.
• Add Extra Width: For better light coverage, it's a good idea to add 2 to 4 inches to each side of your measurement when you're ordering. This extra width helps block out more light effectively.

Step 3: Measure the Window Height

• Determine the Height: Measure the height from the top to the bottom of the outer edge of the window frame or molding at three points: left, center, and right.
• Record the Longest Measurement: This will be your window height for outside mount.
• Add Extra Height: To minimize light gaps and ensure you have enough flat space above the window or frame molding for the brackets, consider adding 4 to 8 inches to your measurement when you're ordering.

Step 4: Double Check All Measurements

Shades and Blinds Measuring Tips

• Use a steel measuring tape for accurate measurements.
• Always measure to the nearest 1/8 inch; avoid rounding to the nearest half or whole inch.
• Clearly label both the width and height, and be careful not to mix them up.
• Measure each dimension at least twice to avoid errors.
• Be mindful of the style of the blinds or shades you choose, as some may require additional space for installation.
• Ensure there are no obstructions (like doorknobs, deadbolts or moldings) that could interfere with the operation of your window coverings.

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