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Many homeowners in California ask the same question: can I build an ADU on my property? With housing costs rising in Los Angeles and San Diego, accessory units have become one of the most practical ways to add space and value. But eligibility depends on zoning, size limits, and placement rules. This guide explains what qualifies, what limits exist, and what to expect before starting.

Planning to build an ADU in 2026? The Southern California market is competitive. Demand is high. Cities update zoning rules often. Homeowners expect clear budgets, fast permits, and functional design. The top ADU builders in Southern California stand out for their systems. They focus on process, cost control, and predictable timelines. Here is what matters today.