Accessory Dwelling Units (ADUs) have become one of the most popular ways for homeowners to maximize their property. With rising housing demand and families needing flexible living space, building an ADU is a smart investment.
Whether you want to create rental income, house family members, or increase your property value, understanding how ADUs work is the first step toward a successful project.
This guide explains the benefits, planning considerations, and key steps to building an ADU in 2026.
An Accessory Dwelling Unit (ADU) is a secondary residential unit built on the same property as a primary home. It functions as a fully independent living space with its own kitchen, bathroom, and sleeping area.
ADUs are also called:
Many cities now support ADU development with more flexible regulations because they provide additional housing without purchasing new land.
ADUs are popular because they provide both financial and lifestyle benefits.
An ADU can create a steady source of passive income by renting the unit long-term or using it as a short-term rental (where allowed).
Estimate potential returns using the ADU ROI calculator →
Adding an ADU often makes a property more attractive to buyers. Homes with extra living space and rental potential can command higher resale value.
ADUs are ideal for families who want to live close together while maintaining privacy. They are often used for:
This allows families to stay connected without sacrificing independence.
Even if you don’t rent it out, an ADU can be used as a:
This flexibility makes ADUs one of the most versatile home additions.
The right type of ADU depends on your property layout and goals.
A detached ADU is a separate structure in the backyard. It provides the most privacy and is often preferred for rental use.
An attached ADU is connected to the primary house, which can simplify utility connections.
Converting an existing garage into an ADU can be a faster way to create livable space using an existing structure.
A junior ADU is a smaller unit created within the existing home, typically using extra space like a spare bedroom.
Before starting construction, it’s important to check if your property is suitable. Key factors include:
Start evaluating your property using the ADU planning portal →
Construction costs vary depending on design, site conditions, permits, and utilities.
The ADU Cost Calculator helps you get a realistic starting point for budgeting
Many homeowners finance ADU projects since the unit can generate income over time. Common financing options include:
Check your eligibility using the ADU Loan Qualifier
For many homeowners, building an ADU is a long-term investment that increases both property value and financial flexibility.
ADUs allow you to:
Plan your ADU project with these tools:
Planning Tip:
Before hiring designers or contractors, use an ADU calculator to understand your project’s feasibility and potential return. Early planning can help avoid costly surprises.