You will increase appraisal value and give your house a distinctive look by replacing your dated, old garage door. It's not just a detail - your garage door occupies a big visual space, as much as a third of your home's exterior. Upgrade your garage door and you'll get back an average of 83.7 percent of the cost when you sell your house. That figure puts new garage door installation in the Top 5 value-adding home improvements, according to Remodeling Magazine's respected 2014 cost vs. value report.