Guess what the top home improvement project nationwide with the highest ROI was? Upgrading your garage door! The 2018 Cost vs. Value Report by Remodeling magazine and the National Association of Realtors compared construction cost estimates for 21 common home improvement projects in 149 markets nationwide. They estimated the average ROI by evaluating the increase in a home’s selling price if the project was completed within a year of the sale. At resale, the average homeowner