The process of building new houses in already developed neighborhoods, typically in areas with a higher population density. Infill housing is seen as an important solution to the affordable housing crisis, as it can increase the supply of housing in an area and make housing more accessible to a wider range of people. Infill housing can be an important tool for revitalizing aging neighborhoods and breathing new life into them. It can also help increase property values and can benefit the community by reducing urban sprawl.