The cost of window replacement varies widely based on factors like window type, material, size, and installation complexity. On average, homeowners can expect to spend between $300 and $1,000 per window, including both the window unit and installation. High-end materials, custom sizes, and specialized features such as energy-efficient or triple-pane windows can drive costs higher. It's advisable to get multiple quotes from professional window replacement companies to find the best price for your specific needs.