What Is an ADU? Understanding the Different Types and Their Benefits
An Accessory Dwelling Unit (ADU) is a fully independent home built on the same property as a primary residence. Every ADU includes its own kitchen, bathroom, sleeping area, and private entrance, allowing it to function as a complete living space. California offers several types of ADUs, each designed to fit different properties and homeowner goals.
Detached ADU
A detached ADU is a separate structure built away from the main house, typically in the backyard. It offers the highest level of privacy and is an excellent choice for rental income, guest accommodations, or multigenerational living.
Attached ADU
An attached ADU is connected to the primary residence through an addition or existing structure. Although it shares a wall with the main home, it functions as a completely independent living space.
Garage Conversion ADU
A garage conversion transforms an existing garage into a legal residence. Since garages were not originally designed for living, they require upgrades such as insulation, plumbing, electrical systems, ventilation, and energy-code compliance.
Above-Garage ADU
An above-garage ADU is built on top of an existing or new garage. This design maximizes the use of the property while preserving valuable backyard space and providing additional privacy.
Junior ADU (JADU)
A Junior ADU, or JADU, is created within the existing footprint of a single-family home. These smaller units are commonly used for family members and offer a more affordable way to add living space.
Every property is unique, and the best ADU option depends on your lot, budget, and long-term goals. Understanding these different types is the first step toward choosing the right solution for your property.
Why Homeowners Build ADUs
Generate Rental Income
Many homeowners build ADUs to create a steady source of rental income that can help offset mortgage payments, supplement retirement income, or improve monthly cash flow.
Multigenerational Living
ADUs provide a comfortable space for aging parents, adult children, or extended family while allowing everyone to maintain their independence and privacy.
Increase Property Value
A legal, well-designed ADU often increases a property's value by adding usable living space and creating more flexibility for future buyers.
More Flexibility
An ADU can also serve as a home office, guest house, caregiver suite, or future retirement space. As your family's needs change, your property can adapt without requiring you to move. Building an ADU is more than adding extra square footage—it's creating new opportunities for your family and maximizing the potential of your property.
Ready to Find Out If Your Property Qualifies for an ADU?
Before investing thousands of dollars in design or permits, start with our Free ADU Scorecard. In just a few minutes, you'll receive a preliminary evaluation of your property's ADU potential and learn which options may work best for your goals.
👉 Start your Free ADU Scorecard here:
https://www.plushomeadu.com/adu-scorecard