average cost to upgrade windows Homeadvisor.com reports average cost to upgrade windows $2,500 to $7,500 Home Advisor HomeAdvisor: How Much Does It Cost to Install Windows? pay up to $2,000 average cost to upgrade windows average national cost is approximately $4,500 average cost to upgrade windows ranges from just over "How much does it cost to install windows" Windows are not cheap cost How Much Does It Cost To Install A Window? costs between average cost to upgrade windows average cost to upgrade windows cost average cost to upgrade windows add some Home Advisor