By Made in the Shade Team — 20+ years of expert window-treatment installation
Choosing between inside vs outside mount roman shades comes down to three things: your window frame depth, how much light control you need, and the look you want. Inside mount gives a tailored, recessed appearance. Outside mount offers better light blocking and works with any window depth.
What is the difference between inside and outside mount roman shades?
The two mount types describe where the shade is physically attached.
Inside mount means your roman shades fit inside the window frame itself, attached to the ceiling of the window casing, sitting flush within the recess. This creates a clean, tailored look that shows off your window trim.
Outside mount means the shades are installed on the wall or ceiling above and around the window frame, extending beyond the casing on all sides.
Both options work beautifully with custom roman shades, but the right choice depends on your specific window and room. Between inside vs outside mount, inside mount is typically the more popular installation method. It offers a sleek, minimalist look with the ends and sides of your window treatments tucked neatly inside the frame.
That said, outside mount is quickly gaining ground, especially in rooms where light control matters most.
When should you choose inside mount roman shades?
Inside mount is the go-to option when you have the frame depth to support it and want a precise, architectural finish. A casing depth of at least 2 inches is ideal for the shade to sit flush.
Inside mount roman shades require a minimum window frame depth of about 1.5 to 2.5 inches, depending on the product and lift system. Motorized shades typically need closer to 3 to 4 inches because the motor housing takes up additional space.
Inside mount shines in these situations:
- You have decorative trim or ornate moldings you want to show off
- Your room has a modern, contemporary, or minimalist design
- You plan to layer the shades with drapery and curtains (the brackets stay tucked inside, out of the drape rod’s way)
- You have limited wall space above the window
When layering roman shades with curtains, the inside mounting position is ideal. The shades fit compactly within the window frame, while drapery offers sweeping coverage over the window. Each layer has its own operating space without crowding the other.
One trade-off worth knowing: inside mount shades leave small gaps on the sides, roughly 0.25 inches, so the shade can move freely. In bedrooms or media rooms where true blackout conditions matter, those gaps can be a real problem.
When should you choose outside mount roman shades?
Outside mount is the stronger performer for light control and works on virtually any window.
Outside mount shades cover the entire window and extend a few inches past the frame on every side. That overlap is the difference between “mostly dark” and “almost completely dark.” For bedrooms, nurseries, home theaters, or any space where light control is non-negotiable, outside mount wins.
By mounting the shade higher and wider than the actual window, you can make small windows look bigger and low ceilings feel taller. It’s a simple visual trick that can shift how an entire room reads. Outside mount is also the solution when your frame is too shallow, or when cranks, handles, or alarm sensors block an inside installation.
Here is a quick side-by-side comparison:
| Factor | Inside Mount | Outside Mount |
|---|---|---|
| Minimum frame depth needed | 1.5 to 2.5 inches | None |
| Light control | Good (small edge gaps) | Better (full overlap) |
| Aesthetic | Tailored, recessed, minimal | Bold, larger appearance |
| Shows window trim | Yes | No |
| Works for blackout needs | Partial | Yes (especially with blackout liner) |
| Best for layering drapes | Yes | Less ideal |
| Works on shallow frames | No | Yes |
| Measurement precision required | High | More forgiving |
Inside mounts demand precise measuring, while outside mounts are more forgiving. That difference matters especially in older homes or rentals.
How do you measure for each mount type?
Measuring correctly is the step where most DIY installations go wrong. The approach is different for each option.
For inside mount: Measure the width of the window opening at the top, middle, and bottom. Use the narrowest measurement. Measure the height from the top of the opening to the sill.
For outside mount: Decide how far beyond the frame you want the shade to extend on each side (2 to 4 inches is standard), then measure that total width and total drop. You will order a larger shade than the window’s actual dimensions to ensure full coverage. Check for obstructions like cabinet doors, furniture, or trim profiles before finalizing your mounting location. Inside mounts are also worth considering for windows with little wall space above, since they do not require the extra 4 inches needed for outside mounts.
In our 20+ years of installing window shades in homes across the country, we’ve seen what happens when measurements are even slightly off on an inside mount. A professional measure eliminates that risk entirely.
Frequently asked questions
Do inside mount roman shades block light as well as outside mount? Not quite. Inside mount shades leave small gaps on the sides, about 0.25 inches, so the shade can move freely. Outside mount shades extend beyond the window frame, covering more area and blocking more light. If you need near-total darkness, outside mount is your better bet.
Can I do an outside mount if my window frame is shallow?
If your window frame is not deep enough for inside mount, go with outside mount. It does not require any frame depth since it mounts on the wall or ceiling. This is a common situation in older homes or with certain window styles, and outside mount works just as beautifully.
Which mount type works better with motorized roman shades? Either mount type works with motorized window treatments, but keep frame depth in mind. Motorized shades typically need closer to 3 to 4 inches of frame depth because the motor housing takes up additional space. If your frame is shallower than that, outside mount is the practical choice.
Does outside mount make windows look bigger?
Outside mount is the option that makes a room feel bigger than it actually is. By mounting the shade a few inches above and wider than the frame, you trick the eye into perceiving taller windows and higher ceilings. It’s one of the oldest staging techniques interior designers use, and it still works.
Is inside mount harder to install?
Inside mounts require precise measurements and enough frame depth to fit properly. Outside mounts are more forgiving. They do not rely on exact dimensions or depth, making them easier to install.
The bottom line
Inside vs outside mount roman shades is not a question of better or worse. It is a question of what your window can support and what your room actually needs. Inside mount delivers a refined, custom look that flatters trim and works perfectly alongside drapes. Outside mount gives you superior light control, works on shallow frames, and can visually expand a small space.
If you are still unsure after reading this guide, do not guess. A wrong measurement on an inside mount means a shade that does not fit. A room with blackout requirements that gets inside-mounted shades will still let light leak in at the edges every morning. Getting it right the first time is worth a conversation with someone who does this every day.
Our free in-home consultation gives you access to expert advice, real samples, and accurate measurements from people who care about getting it right. Let’s make your windows work for you. Book your free consultation here.
Although we’re based in Meridian, Made in the Shade serves clients nationwide. No matter where you live, you can expect personalized consultations and access to our high-quality window treatments. Visit Madeintheshadeblinds.com to locate your nearest showroom.
