Several factors can influence the cost of window replacement, including: Window size and quantity: Larger windows and replacing multiple windows will naturally cost more. Window style: More intricate styles like bay or bow windows may be pricier than standard double-hung windows. Window material: Vinyl windows are generally the most affordable, while wood or fiberglass windows can be more expensive. Energy-efficiency features: Windows with advanced features like double-paned glass and low-emissivity coatings will cost more upfront but offer significant energy savings over time.