What is an ADU and Why Build One?

ADUs are identified in three primary ways, with all having similar characteristics: attached dwelling units, accessory dwelling units or additional dwelling units that are situated on the same lot as a primary residence and typically share a common wall or floor and ceiling with the primary dwelling. Some examples include a daylight basement, living quarters above a garage, a bump-out or an addition to the existing residential structure.

An expanded definition of an ADU is a DADU, or detached accessory dwelling unit, often referred to as a carriage house or guest house. DADUs have more stringent lot-line setback and maximum lot coverage requirements than ADUs. For simplicity, this article will cite ADU to represent all attached or detached additional residential structures on a single residential building lot.

High-durability, low-maintenance envelope makes this structure ideal for retirement living.