Remodeling Projects With the Highest Returns For the second year in a row, REALTORS® report that exterior remodeling projects return the most money as a percentage of cost, as detailed in the 2008 Remodeling Cost vs. Value Report. On a national level, wood deck additions and all types of siding replacements–upscale fiber cement, midrange vinyl, and upscale foam-backed vinyl–returned more than 80 percent of project costs upon resale. Of these, the most profitable project was upscale fiber ce