What is the difference between inside mount and outside mount shades?

Inside mount installs the shade within the window frame for a clean, built-in look. It requires at least 2 inches of frame depth. Outside mount installs above and beyond the window casing — it doesn't require minimum depth and is ideal for covering imperfections or maximizing light blockage.

How do I measure for inside mount shades?

Measure the inside width at three points (top, middle, bottom) and use the narrowest measurement. Measure the inside height at three points (left, middle, right) and use the longest measurement. Confirm the frame depth is at least 2 inches for bracket clearance.

How do I measure for shades on a bay window?

Mark a projection point 2–3 inches deep in each corner angle of the bay. Measure the center panel between the two projection marks. Measure each side panel width, adding overlap only to the outermost edge to ensure panels clear each other.

What measuring tape should I use for window shades?

Always use a steel measuring tape for accuracy. Measure to the nearest 1/8 inch and avoid rounding. Cloth measuring tapes can stretch and give inaccurate readings.

What is a headrail and why does it matter for measuring?

The headrail is the top mounting component of the shade that houses the operating mechanism. Its size determines the minimum inside mount frame depth required and the additional height needed for outside mount installations. Always check the headrail dimensions for your specific shade type before ordering.

How much should outside mount shades overlap the window frame?

Adding 1–3 inches of overlap on each side of the window frame is recommended for optimal light control and privacy. If your window frame is thick enough to naturally block light at the edges, no additional overlap is required.

How To Measure For Shades?

Q: How do I measure for outside mount shades?

Measure the desired total width, adding 1–3 inches beyond the window frame on each side. For height, measure from the desired top mounting point to the bottom of the sill, adding 4–6 inches above the window opening for optimal light control and headrail clearance.

Accurate measurements are essential when ordering shades to ensure a perfect fit and optimal functionality. The two primary mounting options are inside mount and outside mount, each with distinct advantages.

Two Primary Mounting Options:

Inside Mount:

Installing shades within the window frame offers a clean, streamlined appearance and preserves the window trim. However, it requires sufficient window depth—typically at least 2 inches—to accommodate the mounting brackets and shades. If your window depth is inadequate, consider opting for an outside mount.

Outside Mount:

Mounting shades outside the window casing can cover imperfections and provide a more substantial presence. This method is versatile and doesn't require a minimum window depth, making it suitable for various window types, including those with shallow sashes or deep window sills.

Measuring for Different Mount Types:

Measuring for Inside Mount Shades:

Width: Measure the inside width of the window frame at three points—top, middle, and bottom. Use the narrowest measurement to ensure the shade fits within the frame.

Height: Measure the inside height at three points—left, middle, and right. Use the longest measurement to ensure the shade covers the entire window height.

Depth: Measure the depth(at least 2 inches) of the window frame to confirm it can accommodate the mounting brackets and shade.

Measuring for Outside Mount Shades:

Width: Measure the desired width, extending beyond the window frame to cover the casing and allow for mounting brackets. Adding 1-3 inches to the width is recommended for optimal light control and privacy. Not adding width is ok if your frame is thick enough to keep light out.

Height: Measure from the desired top mounting point to the bottom of the window sill or the point where you want the shade to end. Adding 4-6 inches to the height above the window opening is recommended for optimal light control, and the shade headrail has its own height (especially the cordless and motorized system), making it above the window for not against your window decor frame. Or add at least 2 inches for the brackets to install.

Measuring for Bay Window:

Determine Projection (P): Mark the depth 2 to 3 inches, the shades will project from the wall in the corner angles.
Measure Center Panel: Measure the width between the two P marks in the corners of the center window.
Measure Side Panels: Measure the width of each side window, adding desired overlap only to the outermost edge of the bay. This ensures clearance.

Additional Tips:

Use a Steel Measuring Tape: For accuracy, use a steel measuring tape instead of a cloth one.

Measure to the Nearest 1/8 Inch: Precision is crucial; avoid rounding measurements.

Account for Obstructions: Identify any window hardware, handles, or obstructions that might interfere with the shade's operation.

Consider Mounting Hardware: Ensure there's sufficient space above the window for mounting brackets, especially for outside mounts.

The Shades' Headrail Size

The shade's headrail size will require inside mount frame depth and outside mount height. Please check the headrail size of different types of shades below: