Accessory Dwelling Units are becoming popular across the USA, but the permit process can be confusing. Every ADU is reviewed as its own independent structure, which means you need separate drawings, separate compliance checks, and sometimes separate utility connections. In this guide, we explain what drawings you need for an ADU permit, what local authorities look for, and how to prepare a set that gets approved without delays. Ideal for homeowners, builders, and small developers planning a backyard unit.