The depreciation of a new roof on a commercial rental property depends on various factors, including the type of roofing material, the quality of installation, and the maintenance efforts. While commercial roofs can last anywhere from 15 to 50 years, the depreciation rate will differ based on these factors. Regular maintenance and timely repairs can help extend the life of a commercial roof and slow down the depreciation process. For accurate depreciation estimates, it’s best to consult with a professional roofing contractor like Buck Roofing.