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When choosing window blinds or shades, one of the most important decisions is whether to use an inside mount or outside mount. This choice affects how your window treatments look, how they function, and how much light they block.
Understanding the differences between inside and outside mounts will help you choose the best option for your windows and your space.
Browse our full selection of custom made window blinds and custom made window shades, or learn how to measure in our How to Measure for Blinds guide.
What Is an Inside Mount?
Inside mount blinds or shades are installed within the window frame. This creates a clean, built-in appearance that sits flush within the window opening.
- Installed inside the window frame
- Creates a streamlined, finished look
- Requires precise measurements
Pros of Inside Mount
- Clean, modern appearance
- Shows off window trim and molding
- Works well with most blinds and shades
Cons of Inside Mount
- May allow light gaps along the edges
- Requires sufficient window depth
- More precise measuring is needed
What Is an Outside Mount?
Outside mount blinds or shades are installed outside the window frame, either on the wall or above the trim. This allows the window covering to fully cover the opening.
- Installed outside the window frame
- Covers the entire window opening
- Can be mounted on wall or trim
Pros of Outside Mount
- Better light blocking and privacy
- Ideal for blackout applications
- Works well for shallow or uneven window frames
Cons of Outside Mount
- Less of a built-in appearance
- Covers window trim
- Requires more wall space
Inside Mount vs Outside Mount: Key Differences
| Feature | Inside Mount | Outside Mount |
|---|---|---|
| Appearance | Clean and built-in | More prominent |
| Light Blocking | May have light gaps | Better coverage |
| Installation | Requires precise fit | More flexible |
| Best For | Decorative look | Privacy and blackout |
Which Mount Option Is Best?
The best choice depends on your goals and your window type:
- Choose inside mount for a clean, modern look and when your window frame has enough depth
- Choose outside mount for better light blocking, privacy, or if your window frame is shallow or uneven
When to Use Inside vs Outside Mount
| Situation | Best Option |
|---|---|
| Deep window frame | Inside mount |
| Need blackout or minimal light gaps | Outside mount |
| Show off window trim | Inside mount |
| Shallow window frame | Outside mount |
Measuring for Inside vs Outside Mount
Measuring correctly is essential for both mount types:
- Inside mount requires precise width and height measurements inside the frame
- Outside mount requires measuring the area you want to cover, including extra width for better coverage
Learn more: How to Measure for Blinds
Inside vs Outside Mount for Blinds vs Shades
Both blinds and shades can be installed as inside or outside mounts. However, outside mount is often preferred for blackout shades, while inside mount is commonly used for blinds where appearance is a priority.
Explore Window Treatment Options
Final Thoughts
Choosing between inside mount and outside mount blinds or shades depends on your window, your design preferences, and how much light control you need. Inside mount offers a clean, built-in look, while outside mount provides better coverage and light blocking.
Inside vs Outside Mount FAQs
Is inside mount or outside mount better?
Inside mount is better for a clean look, while outside mount is better for blocking light and improving privacy.
Do inside mount blinds let in light?
Yes, inside mount blinds may allow small light gaps along the edges because they sit within the window frame.
Are outside mount shades better for blackout?
Yes, outside mount shades are typically better for blackout because they cover the entire window and reduce light gaps.
Can all blinds and shades be installed as inside or outside mount?
Most blinds and shades can be installed either way, but the best option depends on your window depth and your goals for light control and appearance.
