Dressing an arched window presents a unique opportunity to highlight one of a home’s most distinctive architectural features. While the process requires a bit more planning than a standard rectangular window, the result is a tailored, high-ceiling look that enhances the grandeur of the space. This guide provides a step-by-step approach to achieving a polished finish on your curved opening.
Essential Measurements for Arched Windows
Accuracy is the foundation of a successful arched curtain installation. You must gather three key measurements: the width of the arch at its widest point, the vertical drop from the top of the arch to the windowsill or floor, and the radius of the curve. To find the radius, use a tape measure to mark the center point at the top of the arch and measure the distance to the edge of the curve. Having these dimensions precise ensures your panels clear the arch and stack correctly without dragging.
Tools and Hardware You Will Need
Before you begin, assemble the necessary tools to streamline the process. You will need a sturdy step ladder, a measuring tape, a level, a pencil for marking, a power drill with appropriate bits, and a heavy-duty hammer if using a wooden valance. For the hardware itself, you will require brackets strong enough to handle the weight of the fabric, which for an arched window are typically spaced closer together than for a standard window to prevent sagging at the curve.

Selecting the Right Hardware and Style
The choice of rod is critical for the structural integrity and aesthetic of the project. A standard traverse rod is difficult to adapt to the arch, so most installers opt for a stationary rod. Because the brackets bear the entire weight of the drapery, you must select robust hardware that complements the arch’s contour. For the style, consider ceiling-mounted brackets that allow the fabric to sit high, elongating the wall and maximizing the sense of height in the room.
Matching Hardware to Your Curtain Weight
- Lightweight sheers: Use plastic or basic metal brackets.
- Medium weight linen: Choose powder-coated metal or vintage-style cast iron brackets.
- Heavy velvets or lined drapes: Invest in heavy-duty steel brackets anchored into studs.
Additionally, you must decide between a rigid rod or a flexible track system. A rigid rod offers a clean, classic line that perfectly mirrors the arch’s shape, while a flexible track system allows you to hide the mechanism behind the valance and provides smoother operation for opening and closing.
Installation Process Step by Step
Begin by marking the bracket locations on the wall, ensuring they align perfectly with the studs within the arch’s frame. Use the level to confirm the brackets are even, as an uneven installation will be glaringly obvious on a curved surface. When drilling, prioritize securing the outer brackets first, then measure the exact distance between them to space the intermediate brackets accordingly. This prevents the rod from bowing under the fabric’s weight.

Finishing Touches: The Valance and Hemming
The valance is the crowning touch for an arched window, serving to hide the hardware and tie the look together. A wooden valance cut to match the arch’s radius creates a striking contrast against the soft curves of the glass. If you prefer a softer look, fabric-covered valances or swags can be used. Regarding the panels themselves, hemming the fabric to the appropriate length is essential; ensure the material clears the arch’s peak by a few inches to avoid catching on the hardware during operation.
Finally, step back and assess the symmetry. Adjust the panels so the folds are balanced on both sides of the apex, and ensure the fabric falls in graceful cascades down the sides. With the correct measurements and robust hardware, your arched window will become a stunning focal point that elevates the entire room’s design.























