Casement window replacement costs typically start from $1000 per window, depending on the size, material, and glass type. These windows are hinged at the side and open outward, offering excellent ventilation and unobstructed views. Known for their energy efficiency and tight seal when closed, casement windows are a popular choice for homeowners looking to upgrade both style and performance. Features like double or triple glazing, vinyl or fiberglass frames, and Low-E glass can influence the final price, but overall, they offer a great balance of functionality and value.