Short curtains are typically only used when long curtains are unrealistic (such as when a radiator, the bed headboard, or some other object would interfere with the curtains). In addition, long curtains provide a better aesthetic and can make the room appear bigger, especially when hung higher than the window frame.
Curtains absolutely can make a room look smaller or larger, depending on their design. Thick curtains and dark curtains are known for making a regular room look slightly smaller, while sheer curtains made of lightly-colored fabrics are ideal for helping to visually expand a room's size.
Therefore, hang your curtain rod as close to the ceiling as possible – preferably 2 inches below the ceiling molding – and opt for ceiling-to-floor length curtains. This will make your windows appear taller, as long curtains that extend the window frame will make it look like a unified whole.
If you are interested in stationary panels, you will want your curtains to be long enough to lightly brush the floor, but not so long that they bunch up in a pile. A good rule of thumb is for your curtains to break anywhere from a ¼” to ½” from the floor, similar to a break in pant legs on your shoe.
Visually speaking, high-water style is not the most appealing way to hang curtains. The shorter length can appear dated. Also, it can cut the visual height of your room in half. From a purely practical standpoint, however, short curtains are sometimes the best option.
A common rule for displaying curtains properly says the curtains finished width should be at least 2 times the width of your window (if not more - sheers can be 3 times the window width) to achieve a look of proper fullness.
A rule of thumb (from Architectural Digest) is that curtains should be hung between four to six inches above the window frame, so install your curtain rod accordingly. When you hang the curtain rod high, it will make the window appear taller.
Use contrasts and light colors that make rooms look bigger
Light and bright walls are more reflective, making a space feel open and airy, which helps maximize natural light's effect. Dark shades tend to absorb light, making rooms feel smaller. Accent walls to make a room look bigger is another way to go.
Big floral patterns make a room appear larger. Install wallpaper with horizontal stripes to make a room seem wider, or commit to vertical stripes to stretch the room visually and raise the ceiling. A busy pattern featuring chevrons, simple geometric designs, or a texture that mimics marble can make a room seem bigger.
Floor length: Long curtains that go from above your window frame all the way to the floor to create a traditional, formal look. Typical curtain length for this style is 84 to 96 inches; these curtains will fall about 1/4-inch above the floor. They are ideal for living rooms, bedrooms and dining rooms.
Hanging long drapes on a short window is one of the easiest ways to increase the importance of the window and bring it into proportion to the room. Short drapes on a short window call attention to the size of the window and reduce the significance of the room, window and drapery style.
Standard curtains come in three lengths—84 inches, 96 inches, or 108 inches. "Generally, you want to stay away from the 84 inch standard curtains unless you have very low ceilings.
While fashion once dictated a “flood level” bottom line for curtains—one that hung just past the window sill, short enough that it would not get wet in a flood—today, style calls for curtains to either hang down to within ½-inch of the floor or even puddle slightly.
Naturally, white is an obvious choice for making a room feel bigger. It's no secret that light colors make a room look larger, especially if the space is bathed in natural light. Eggshell or satin finishes will help reflect the light, creating the appearance of even more space.
No matter what the ceiling height, the minimum distance from the top of the window casing to the curtain rod is two inches. To create the illusion of height, mount the drapery rods close to the ceiling. This is particularly important to do if the room has low ceilings. Use these same rules when the windows are arched.
The answer to this question is important because it can affect the way we do our decorations. Yes, curtains should be long enough to touch the floor. With a few exceptions, the longer the curtains are the more stylish and elegant it will look. This is why most standard ready-made curtains are lengthy.
Tiebacks slightly shorten curtains. This is why they don't work well with short bedroom curtains. Since shorter curtains form a small bundle when compacted, they look less appealing with the use of tiebacks. So, if you want to pull off short bedroom curtains, push them to the side instead of tying them.
As a general rule of thumb, curtain width should be two to two-and-a-half times the width of the window. Curtains are typically sold as pairs, but you may need to double up depending on the size of your window.
The material should barely touch the floor or hover half an inch above. Use this approach for café curtains, too, short panels covering only the lower portion of a window, hitting the sill, which works well in kitchens and bathrooms, where long drapes or curtains aren't practical.
When you buy them in stores or online, there are two standard lengths: 84 inches and 95 or 96 inches. The length of the curtain dictates the height of the rod. If you buy 84-inch-long curtains, the rod must be mounted roughly 84 inches from the floor if the curtains hang from the rod without rings.