A healthy home is sited, designed, built, maintained, and renovated in ways that support the health of its residents. The concept of healthy homes extends beyond the four walls of a dwelling to its surroundingsto the land immediately around the house, to adjacent structures and amenities (such as outbuildings, trees, and recreational equipment), and to the neighborhood setting. A house does not exist in isolation. Community factors including the ways people behave and relate to each other, the way the community is designed and built, and the state of the environment, contribute critically to healthy homes. Health-promoting features of the community may include sidewalks and bicycle trails; parks and green space; mass transit; and nearby destinations such as stores, schools, and workplaces.