The U.S. has an affordable housing shortage. Could ‘granny flats’ be the answer?

ADUs, commonly called “granny flats” or “mother-in-law suites,” date to antiquity. But there has been renewed interest as housing costs soar across the United States, especially in high-demand, relatively low-density cities along the West Coast. In Southern California, for example, the median sales price for homes is now above $510,000, according to real estate data …