A typical suburban single-family home, the symbol of the American Dream, is often in the middle of a subdivision surrounded by similar homes. Yet, some of these homes are on the edges of developments. This boundaries can be interesting: what do the homes back up to? What is nearby? Three local examples that I see regularly highlight how adjacent suburban residential developments can lead to some sharp contrasts.

First, I know of a 1970s neighborhood of primarily raised ranches and split-levels of roughly 1,500-2,000 square feet. One side of this neighborhood borders a late 1980s development of larger homes built more in the style of 3,000 square foot McMansions with brick or Tudor facades. These two sets of homes back up to each other and the line of homes that do this are quite different: there is a significant size difference, the style of the homes – siding versus different materials – varies, and the newer development is slightly uphill so the larger, newer homes loom over the older, smaller homes.

Second, there are numerous single-family home neighborhoods where houses are across a residential street or next to a small apartment building. Or, next to a townhouse development. The scale of the buildings is not that different but the density and size are clearly contrasting.

Third, I know of one location where there are two neighborhoods that could have been constructed separately as they both have outlets to the neighboring arterial roads. But, there is a connecting road between the neighborhoods and there are houses of each neighborhood type, again different size and style side by side, on this connector.

Single-use zoning in the United States is intended to protect single-family homes from other less desirable land uses. But, this zoning system does not necessarily buffer certain residential neighborhoods from each other. Many suburbanites would object to significant changes in their nearby surroundings if the new residences were quite different. I ran into this in my suburban research where new small homes nearby or apartments were not welcomed, particularly if they were replacing open space. Yet, today many suburbs have different developments side by side, sometimes with a buffer – nature, a berm, a walkway, etc. – but sometimes not.

These neighboring dwellings could signal some significant differences. A larger home suggests a different social class. Residents of apartments are not always regarded fondly by homeowners. Densities and lot sizes can be different. The exteriors imply different status.

These boundaries are symbolic and clearly marked in physical space. What are the consequences: are the residences on these boundaries less desirable or go for a reduced price? How many people care about the clear boundaries? Do the people from the two or more sides interact within these boundary zones?

The boundaries between suburbia and other types of communities is often clear to see and experience but the internal boundaries are also fascinating.