Design ideas for a large contemporary master bathroom in DC Metro with flat-panel cabinets, light wood cabinets, a freestanding tub, an alcove shower, a one-piece toilet, gray tile, porcelain tile, grey walls, porcelain floors, an undermount sink, engineered quartz benchtops, grey floor, a hinged shower door, grey benchtops, a niche, a double vanity and a floating vanity.