How to Choose the Right ADU Type for Your Property in Orange County, California
Building an ADU can add value, flexibility, and income potential to your home—but the first step is choosing the right type. In many Orange County cities, most homeowners can choose from three main ADU types: detached, attached, or conversion. Each fits different sites, budgets, and goals.
1. Detached ADU
A detached ADU is a separate structure built in the backyard. It offers full privacy and design freedom—ideal for rental income or multigenerational living.
Pros: Maximum privacy, full design flexibility, potential for larger size (up to 1,200 sf allowed by most Orange County cities).
Cons: Higher cost for new foundation, utilities, and separate roof.
Best for: Larger lots or homeowners seeking independent rental units.
2. Attached ADU
An attached ADU extends from your main home—such as adding a new wing or second-story suite.
Pros: More cost-efficient than detached, easier to connect utilities, keeps family close.
Cons: Limited privacy, design may be constrained by existing structure.
Best for: Families needing extra living space or guest quarters.
3. Garage Conversion ADU
Converting an existing garage is often the most affordable way to add livable space.
Pros: Uses existing structure, fastest path to permits, lower construction cost.
Cons: Smaller size, may require upgrades for fire separation and energy compliance.
Best for: Homeowners with underused garages or limited budgets.
Key Factors to Decide
Lot Size and Layout – Detached ADUs need clear yard space and access for construction.
Budget and Return – Garage conversions average $120K–$160K; detached builds can exceed $250K+.
Purpose – Long-term rental, family housing, or resale value all affect design direction.
At Backyard Project, we analyze your Orange County property’s zoning, setbacks, and utilities to recommend the best ADU type before you spend thousands on plans.
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