Today, vinyl windows make up as much of the window market as wood windows. Similar to casements, the sash presses against the window frame, which lets the window close very tightly. Expect to pay between $3,000 – $10,000 to replace 10 windows. Expect to pay between $700 – $2,500 to replace 3 windows. Then there’s also the cost of installing the window, which depends on the company you go with.