For optimal light control and privacy, especially with blinds mounted outside the window frame, it is recommended to add an extra 3 inches to both the width and height of your window measurements. This extension provides comprehensive coverage, ensuring fewer light gaps and a more finished look.
Understanding Blind Measurement: Inside vs. Outside Mounts
The amount of extra length or width you need for blinds largely depends on how you plan to install them. There are two primary mounting styles: inside mount and outside mount. Each requires a different approach to measurement.
Outside Mount Blinds: Adding Extra Coverage
Outside mount blinds are installed on the wall or window trim surrounding the window opening, extending beyond its edges. This method offers superior light blockage and enhances privacy by covering the entire window and a portion of the wall around it. Adding extra dimensions to an outside mount blind provides several key benefits:
- Enhanced Light Control & Privacy: Extending the blinds beyond the window opening by at least 3 inches on each side (width) and above/below (height) significantly minimizes light leakage around the edges. This is crucial for bedrooms or any space where maximum darkness and seclusion are desired.
- Space for Mounting Hardware: The additional width provides ample room on the wall or trim to securely install the mounting brackets, ensuring stability and a proper fit without interfering with the window frame.
- Visual Enhancement: By covering more wall space, outside mount blinds can make a window appear larger and more substantial, contributing to the overall aesthetic of the room. This can be particularly useful for smaller windows.
Recommended Extra Measurements for Outside Mounts
For an outside mount, measure the exact width and height of your window opening, then add the following:
| Measurement Type | Extra Addition (Minimum) |
|---|---|
| Window Width | 3 inches (1.5 inches per side) |
| Window Height | 3 inches (1.5 inches above and below) |
These additions are a minimum recommendation for optimum results. Depending on your specific needs for light blockage or aesthetic preference, you might even choose to add more. For example, some prefer to extend blinds 4-6 inches beyond the window frame.
Inside Mount Blinds: Precision is Key
Inside mount blinds are installed within the window frame or casing, fitting snugly into the window opening. For this style, the goal is a precise fit, meaning you typically do not add any extra length or width to your measurements.
- Exact Window Dimensions: Measure the precise width at the top, middle, and bottom of your window opening, and the height at the left, middle, and right. Use the smallest of these measurements to ensure the blinds fit without obstruction.
- No Extra Additions: Unlike outside mounts, you do not add extra inches for inside mounts. In fact, manufacturers often make a slight deduction (e.g., 1/4 to 1/2 inch) from your provided width measurement to ensure the blinds operate smoothly within the frame without scraping.
- Consider Window Depth: Ensure your window frame has enough depth to accommodate the mounting hardware and the blind headrail. Typically, 1.5 to 3 inches of depth is required, depending on the blind type.
Essential Tips for Accurate Blind Measurement
Accurate measurements are the foundation of well-fitting blinds. Here are some essential tips to follow, regardless of your chosen mount type:
- Use a Steel Measuring Tape: Fabric tapes can stretch, leading to inaccurate readings. A rigid steel tape measure ensures precision.
- Measure in Multiple Places: Window openings are rarely perfectly square.
- For width: Measure at the top, middle, and bottom of the window opening.
- For height: Measure at the left, middle, and right sides.
- For inside mounts, always use the smallest width and height. For outside mounts, use the widest and tallest measurements, then add your desired extra length.
- Consider Obstructions: Look out for window cranks, handles, alarm sensors, or any other elements that might interfere with the blind's operation or installation. Factor these into your measurements or consider an outside mount if inside obstructions are significant.
- Account for Stacking Height: For certain types of blinds, like Roman shades or cellular shades, consider how much space the blind will occupy when fully raised or opened. This is known as "stacking height" and can impact your view or access to the window.
- Double-Check Your Work: Always measure twice (or even three times!) before placing your order. It's a small effort that can save significant hassle. For more detailed guidance, consult a comprehensive blind measurement guide.
Why Proper Blind Sizing Matters
Correctly sized blinds are not just about aesthetics; they are crucial for functionality. Well-fitted blinds provide optimal light control, enhance privacy, and contribute to your home's energy efficiency by insulating windows. They also operate smoothly and last longer, making the investment worthwhile. For diverse options and ideas, explore various window treatment options to suit your style and needs.
