Accessory dwelling units, or ADUs, have become one of the most talked-about home improvements in recent years. Whether you’re looking for extra income, a place for aging parents, or flexible space for the future, an ADU could open up new possibilities for your property.
What Is an ADU?
An ADU is a secondary, self-contained living space on the same lot as a primary home. It has its own kitchen, bathroom, and entrance. Common types include:
- Detached ADUs: a separate backyard cottage or small home
- Attached ADUs: an addition connected to the main house
- Conversions: transforming a garage, basement, or other existing space into a living unit
- Junior ADUs (JADUs): a smaller unit created within the walls of the existing home, where allowed
Why Homeowners Are Building ADUs
Rental income. A long-term tenant can help offset your mortgage, property taxes, or other expenses.
Multigenerational living. ADUs let adult children, aging parents, or caregivers live close by while everyone keeps their privacy.
Flexibility over time. Use it as a guest suite or home office today, a rental later, and a place to downsize down the road.
Potential added value. A well-built, permitted ADU can make a property more appealing to buyers looking for income potential or room for extended family.
Many States and Cities Are Making ADUs Easier
As communities look for ways to add housing, many states and cities have updated their rules to encourage ADUs. California has been one of the most active, and other states and municipalities have followed with their own changes. Depending on where you live, recent updates may include:
- Allowing ADUs on more residential lots
- Easing or removing owner-occupancy requirements
- Setting timelines for reviewing permit applications
- Reducing parking requirements or certain fees
That said, ADU rules vary widely from state to state and even city to city. Size limits, setbacks, height, design standards, and rental restrictions can all differ. For the most relevant and up-to-date information, check with your local planning or building department before you start.
What to Consider Before You Build
- Budget: Costs vary widely by location, size, and type. A conversion of existing space is usually less expensive than new detached construction, which can reach several hundred thousand dollars in high-cost markets.
- Financing: Options may include cash, a home equity loan or line of credit, a cash-out refinance, or a renovation loan. Talk with a lender about what fits your situation.
- Permits: Always build with proper permits. Unpermitted units can create problems with insurance, appraisals, and a future sale.
- Property taxes: Adding an ADU will likely increase your assessed value. Ask your local tax assessor how improvements are handled in your area.
- Being a landlord: If you plan to rent, learn your local rental regulations, tenant protections, and insurance needs, or consider hiring a property manager (AARE can help with that!).
- HOA rules: If you live in a community association, review its guidelines early.
Buying a Home With ADU Potential
If you’re house hunting, an existing ADU or a lot with room for one can be a smart long-term feature, especially if you’re considering housing family or offsetting costs with rental income.
Let’s Talk About Your Property’s Potential
Curious whether an ADU makes sense for your home, or looking for a property that already has one? Connect with me to talk through your goals, local market values, and next steps.
This article is for general informational purposes only and is not legal, tax, or financial advice. ADU regulations vary by location, so consult your local officials and professionals about your specific property.
