Window Treatments for a Semi-Circular Window


Semicircular windows are interesting architectural details. Some stand on their own and others adorn the space above a standard window, creating an arched effect. Although they are usually situated high on a wall, you may need to cover a semicircular window for the sake of privacy or to block harsh light. Window treatments for this style of window are not easy to find; if that's the case, make them yourself.

Curved Rod Valance

  • Create a valance based on the dimensions of the window frame and install it with a curved or flexible curtain rod. Measure across the bottom for the width and measure from the bottom-center to the highest point of the arch for the height. Double the width measurement to make a voluminous valance or only add two hemming inches to the width for a sleek valance that hangs straight. Creating the arch is the tricky part. For a full valance, transfer the height measurement to your fabric. Create a gradual, curved line from the center point sloping down to the bottom at each side of the fabric Add two hemming inches to the top and bottom. For a sleek valance, make the curve match the curve of the window and add two hemming inches to the top and bottom. Hem the sides and then the bottom. Next, hem the top, leaving openings at each end to slip the rod through. Use locking drapery hooks to prevent the valance from sliding down the rod, suggests "Better Homes and Gardens."

Window Film

  • An alternative to curtains, vinyl window film is available in solid colors, contemporary patterns and elaborate designs that resemble stained glass. In general, patterns, solid colors and random designs look better on a curved window than do angular designs. An added benefit of window film is that many types of it block UV rays. Installation is quick and mess-free. Cut the film to the correct size. Clean the window, wet the glass with water and remove the film's backing. Apply the film to the glass using a squeegee or credit card to push air bubbles out the edges, as explained at the website Since there is no adhesive, window film is simple to remove when you want a new look.


  • Fans come in ornate fabrics, lace and even paper in an array of colors. Light filtering through Asian paper fans creates a soft glow, according to It will be difficult to find a fan the exact size of your window. However, unless you need to cover the entire glass, a fan is an excellent choice. Arched windows are usually high on a wall, so a little exposed glass should not compromise your privacy. If you want a fan to cover the whole window but can't find one the right size, make your own from rice paper by folding it accordion style, pinching one end with a clip and spreading out the pleats.

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