Inside Window Frame Blinds

Inside mount window treatments sit flush within the window frame, secured to the top or sides of the casing. This clean, finished appearance highlights decorative trim around your windows while providing precise sunlight control. Unlike outside mount installations, inside mount window blinds don't protrude into the room, making them ideal for small spaces.

Inside Mount vs Outside Mount: Understanding the Difference

Before choosing inside mount blinds, it helps to understand how they differ from outside mount installations.

Inside Mount: Inside mount blinds install within the window casing. This method requires sufficient depth between the glass and the end of the window frame. Inside mount window treatments offer a clean look that showcases your window trim and frame details. This installation works best when you have at least three-quarters of an inch of depth available.

Outside Mount: Outside mount window treatments install on the outside of the window frame, either on the window trim, wall, or ceiling. This method creates the illusion of a larger window and works well when depth is limited. Outside mount window blinds can hide unattractive trim or accommodate windows with obstructions.

Key Differences: Inside mount window treatments provide a finished look that highlights window architecture. Outside mount window coverings offer more flexibility for odd-shaped windows or shallow frames. Your choice depends on window depth, obstructions, and aesthetic preference.

Benefits of Inside Window Frame Blinds

Inside mount window treatments offer several advantages that make them a popular choice for homeowners.

Aesthetic Benefits: Inside mount window blinds create a clean, simple, yet stylish appearance that complements both modern and traditional interiors. These window treatments showcase decorative window trim and frame details without covering them. Inside mount installation provides an intentional, tailored look that makes small rooms feel larger and less cluttered.

Functional Benefits: Inside mount window treatments allow for precise sunlight control, enabling you to block out or filter sunlight as needed. These window coverings can be adjusted to obstruct the view from outside, providing increased privacy for your home. When fully raised, inside mount window treatments gather at the top, which may slightly obscure your view.

Energy Efficiency: By fitting snugly within the window frame, inside mount window treatments contribute to insulating your home and reducing energy costs. Cellular shades in particular provide excellent insulation when installed inside mount. This tight fit helps prevent air leakage around the window frame.

Installation Flexibility: Inside mount window treatments work well with layering, allowing you to combine them with additional outside mount treatments like drapes or valances. This versatility lets you create custom looks that suit your design preferences and light control needs.

Window Depth Requirements and Limitations

Understanding window depth requirements helps you determine if inside mount installation will work for your windows.

Minimum Depth Requirements: Most inside mount window treatments require at least three-quarters of an inch of depth between the glass and the edge of the window trim. For two-inch wood and metal blinds to sit flush, you need two and three-quarters inches of depth. Two-inch faux wood blinds require three inches of depth to sit flush within the frame.

Measuring Window Depth: Measure from the glass surface to the edge of the window trim in multiple locations. Take the smallest measurement to ensure your window treatment will fit properly. This measurement determines whether inside mount installation is possible and what treatment types will work best.

When Inside Mount Isn't Possible: You can't use inside mount installation if your window lacks sufficient depth. Obstructions like locks, handles, or cranks may prevent proper installation. If the valance would extend outside the window or the treatment won't lie flush with the frame, outside mount becomes the better choice.

Shallow Window Considerations: Windows with less than three-quarters of an inch of depth need outside mount installation. For windows with limited depth, consider narrow blind styles or treatments designed specifically for shallow frames. Outside mount window coverings offer better options when depth is severely limited.

How to Measure for Inside Mount Blinds

Proper measurement ensures your inside mount window treatments fit correctly. Follow these steps for accurate measurements.

Step 1: Measure Window Depth Measure from the glass surface to the edge of the window trim in three different locations. Use the smallest measurement to confirm inside mount installation is possible. You need at least three-quarters of an inch of depth for most window treatments.

Step 2: Measure Window Width Measure the width of your window frame in three places: top, middle, and bottom. Record all three measurements and use the smallest number as your ordering width. This ensures your window treatment will fit even if the frame isn't perfectly square.

Step 3: Measure Window Height Measure the height or length of your window frame in three places: left side, right side, and center. Use the largest measurement as your ordering length. This accounts for any slight variations in frame dimensions.

Measurement Tips: Always measure inside the window frame, not the trim or exterior dimensions. Use a metal tape measure for accuracy, as fabric tapes can stretch. Measure twice to verify your numbers before ordering. Note any obstructions like locks, handles, or cranks that might interfere with installation.