Germuiller's notable clients included Senator John Sherman and General Abraham D. Hazen. He designed six apartment buildings, though the locations of these buildings are unknown. Germuiller's surviving designs include buildings in Bloomingdale, Brightwood Park, Downtown, Dupont Circle, Georgetown, Logan Circle and Mount Pleasant. The largest surviving examples of his designs are in Capitol Hill and Near Northeast. Several of his buildings are contributing properties to historic districts throughout the city and Germuiller Row, a collection of buildings at 3rd and H Streets NW, is listed on the NRHP.
