"All too often," wrote disabled architect Ronald Mace, "designers don't take the needs of disabled and elderly people into account." Building Access investigates twentieth-century strategies for designing the world with disability in mind. Commonly understood in terms of curb cuts, automatic doors, Braille signs, and flexible kitchens, Universal Design purported to create a built environment for everyone, not only the average citizen. But who counts as "everyone," Aimi Hamraie asks, and how can designers know? Blending technoscience studies and design history with critical disability, race, and feminist theories, Building Access interrogates the historical, cultural, and theoretical contexts for these questions, offering a groundbreaking critical history of Universal Design.