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Discover which Florida cities are the most ADU-friendly in 2025. Learn where zoning laws, permitting, and flexibility make it easier for homeowners to build Accessory Dwelling Units.

If you’re a homeowner in San Diego planning to build an ADU, understanding the city’s permit process is crucial. Getting an ADU permit isn’t just a matter of paperwork and stamps — it’s a detailed, multi-step process involving prescreens, department reviews, and rechecks before you’re cleared to start construction.

The short answer is: it depends. Costs can vary widely depending on size, design, location, and construction method. Below, we’ll break down the main cost factors, explore differences between detached, attached, conversion, and prefab ADUs, and walk through a real-world example to give you a realistic picture.