An Infill development is a project that is to be built on land previously occupied by another building. In most cases this building was getting to the end of its lifespan and torn down, making room for newer development and a fresh addition to the streetscape.

These projects can be designed to the full lot width or the land can be often be subdivided to make room for 2 homes where only one previously stood. This increases city density and combats urban sprawl.

In some cases, zoning of the site may allow duplex housing which provides the benefit of subdividing with reduced construction costs.