Different Kinds of ADUs (And How to Choose One)

Understanding your options is the first step toward building a functional, compliant, and valuable addition to your property. Here are the main types of ADUs allowed under California and Orange County ADU regulations:

Types of ADUs in Orange County

1. Detached ADUs

These are stand-alone structures, often built in the backyard. They offer full independence with their own kitchen, bathroom, and entrance.

• Best for: Rental income, guest houses, multigenerational living

• Size limit: Up to 1,200 sq ft (subject to city-specific limits)

2. Attached ADUs

Built as an addition to your primary home, these units share one wall but function independently.

• Best for: Extended family or extra living space

• Size limit: 50% of the main house, up to 1,200 sq ft

3. Garage Conversions

Convert an existing garage into a fully livable unit. It’s one of the most cost-effective ADU options in Orange County.

• Best for: Lower-budget builds or properties with limited yard space

• Tip: Learn more about garage conversion to ADU in Orange County, CA

4. Junior ADUs (JADUs)

JADUs are compact units (max 500 sq ft) built within the footprint of your existing home—often by converting a bedroom or part of the garage.

• Best for: Homeowners with limited space who want to house family or generate modest rental income

• Requirements: Must include an efficiency kitchen and may share a bathroom with the main house

How to Choose the Right ADU for Your Property

Here are a few factors to help you decide:

✅ Lot Size & Layout – Detached units need more open space, while garage conversions and JADUs are ideal for smaller lots.
✅ Budget – JADUs and garage conversions are usually less expensive than detached builds.
✅ Purpose – Think about how you’ll use the ADU (rental income, family use, guest space, etc.).
✅ Zoning & Setbacks – Local zoning laws, lot coverage, and setback rules may affect what you can build.
✅ Access & Privacy – Separate entrances, driveways, and utilities may influence the type of ADU that works best.

Want to get specific? We offer custom ADU design in Orange County, CA and full feasibility studies to help you choose the right path.

Final Thoughts

Whether you're planning a detached backyard cottage, a sleek garage conversion, or a compact in-home suite, there’s an ADU option for nearly every property in Orange County. The key is to align your goals, space, and budget with the right type of unit.

Need help getting started? Contact us today.