A new book by urban planning professor Vinit Mukhija tracks the evolution of single-family living, once held up as an expression of American individuality and prosperity but now under reexamination as homeowners modify their property in response to economic, social and cultural demands. In “Remaking the American Dream: The Informal and Formal Transformation of Single-Family Housing Cities,” published by MIT Press, Mukhija uses Los Angeles as a case study and includes lessons from Santa Cruz, Seattle, Portland, Minneapolis and Vancouver. Across the U.S. and in other countries, homeowners are building backyard cottages, converting garages, basements and recreation rooms, and carving out independent dwellings from their homes to increase and diversify the housing supply. In addition to such un-permitted “informal housing,” some governments are modifying once-rigid land-use regulations to encourage the construction of additional units on lots formerly zoned for a single home. These trends have resulted in a transformation of both the urban landscape and the American psyche, Mukhija writes. He urges planners, urban designers, and local and state elected officials to broaden their thinking on housing options, particularly for disadvantaged groups. “After almost a century of public policy and cultural support for an ideology of single-family housing homeownership, there is a growing recognition that the social, economic and environmental cost of single-family living may outweigh its benefits,” Mukhija writes. “I see the potential for a more open, diverse, just and sustainable American city.”