Accessory Dwelling Units (ADUs), also known as in-law units and casitas, are fully independent living quarters, created on properties which allow residential land use and are developed, or proposed for development, with a primary residence. ADUs are clearly accessory to a primary single-family or multi-family residence and are subordinate to it in size, location, and appearance. They may be created through new construction or through converting existing permitted interior space, or a carport, into an ADU. ADUs add to the local rental housing stock, can make home rental and ownership more affordable, allow opportunities for aging in place and may reduce greenhouse gas emissions when constructed in areas near public transit and services.