Choosing between inside mount and outside mount blackout shades can significantly affect light control, privacy, appearance, and overall blackout performance. While both mounting styles can work well, the best option depends on your window depth, room goals, and how much outside light you want to block.
Understanding the differences between inside and outside mount blackout shades can help homeowners create darker, more comfortable spaces for bedrooms, nurseries, media rooms, and other light-sensitive environments.
Browse our selection of blackout and room darkening shades or explore our guide to inside mount vs outside mount blinds and shades.
What Are Inside Mount Blackout Shades?
Inside mount blackout shades are installed inside the window frame. This mounting style creates a clean, built-in appearance and is one of the most popular choices for modern window treatments.
However, because the shade must fit inside the window opening, small gaps are typically needed on the sides for operation. These gaps can allow some light to enter around the edges.
What Are Outside Mount Blackout Shades?
Outside mount blackout shades are installed above or outside the window frame and extend beyond the opening. This allows the shade to cover more of the surrounding area, which can help reduce light gaps.
Outside mount shades are often preferred when maximum darkness and improved light control are priorities.
Inside Mount vs Outside Mount Blackout Shades
| Feature | Inside Mount | Outside Mount |
|---|---|---|
| Appearance | Clean and built-in look | Can make windows appear larger |
| Light Gaps | More common | Reduced light gaps |
| Blackout Performance | Good | Usually better for maximum darkness |
| Window Depth Required | Yes | No |
| Privacy | Good | Excellent coverage potential |
Why Light Gaps Matter with Blackout Shades
Blackout fabrics block light through the material itself, but mounting style affects how much light enters around the edges of the shade.
Inside mount blackout shades often leave small gaps between the shade and the window frame so the shade can raise and lower properly. These gaps may allow sunlight, streetlights, or exterior lighting to enter the room.
Outside mount blackout shades typically provide better side coverage because they extend past the window opening.
When Outside Mount Blackout Shades Are Better
- You want maximum room darkening
- You are sensitive to outside light while sleeping
- You have a nursery or media room
- Your windows have shallow depth
- You want to reduce edge light gaps
When Inside Mount Blackout Shades Are Better
- You prefer a cleaner built-in appearance
- You want to highlight decorative trim
- Your room does not require total darkness
- Your windows have enough mounting depth
Total Blackout Shades with Side Tracks
For homeowners looking for the highest level of blackout performance, some blackout shades include side tracks that help reduce light leakage along the edges of the shade.
Explore: total blackout shades with side tracks
Can Curtains Help Reduce Light Gaps?
Yes. Decorative drapery panels or blackout curtains can help cover side gaps and improve overall room darkening when layered with blackout shades.
Many homeowners combine blackout shades with curtains for both style and improved light control.
Compare: blackout shades vs curtains for light control
Do Outside Mount Shades Help with Energy Efficiency?
Outside mount blackout shades may help improve insulation coverage by covering more of the window opening. This can help reduce sunlight and improve comfort in some rooms.
Learn more: do blackout shades reduce heat transfer through windows?
Blackout Shades vs Room Darkening Shades
If you are deciding between blackout and room darkening materials, blackout shades generally provide stronger light control, especially when paired with outside mount installation.
Learn more: blackout vs room darkening shades
Shop Blackout Shades
Explore our collection of blackout and room darkening window shades to compare blackout fabrics, mounting styles, and customization options.
Explore More Blackout Shade Guides
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- Blackout shades compared to curtains
- Light filtering vs room darkening vs blackout
- Inside mount vs outside mount blinds and shades
Final Thoughts
Outside mount blackout shades are often the better choice when maximum darkness and reduced light gaps are the primary goals. Inside mount blackout shades remain popular for their clean appearance and built-in look.
Understanding how mounting style affects blackout performance can help homeowners select the right solution for bedrooms, nurseries, media rooms, and other light-sensitive spaces.
Inside vs Outside Mount Blackout Shade FAQs
Are outside mount blackout shades better?
Outside mount blackout shades are often better for reducing light gaps and creating darker rooms because they extend beyond the window opening.
Do inside mount blackout shades have light gaps?
Yes. Small gaps are usually required between the shade and the window frame so the shade can operate properly.
How can I reduce light gaps with blackout shades?
Outside mount shades, side tracks, and layering blackout shades with curtains can help reduce light gaps.
Are blackout shades good for bedrooms?
Yes. Blackout shades are one of the most popular bedroom window treatment options because they help create darker sleeping environments.
