How the ADU Permitting and Construction Process Works

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The ADU process follows three main stages: design and permitting, construction, and final approval. Understanding each step ahead of time helps homeowners and investors avoid delays, budget overruns, and legal issues when renting out the unit.

The first step is design and permits. An architect or ADU designer is hired to verify zoning rules, setbacks, maximum unit size, and allowable layouts based on city regulations. Once feasibility is confirmed, detailed construction plans are created and submitted to the city for review. Most cities require revisions before approval, which can extend timelines. After the plans are approved, the city issues building permits, allowing construction to begin legally.

The second step is building the ADU. A licensed contractor constructs the unit according to the approved plans. This includes site preparation, foundation work, framing, plumbing, electrical, and interior finishes. During construction, the city performs required inspections at multiple stages to ensure the ADU meets building and safety codes. Any failed inspection must be corrected before the project can move forward, which is why working with experienced professionals is critical.

The final step is inspection and occupancy approval. Once construction is complete, the city conducts a final inspection. If the ADU passes, the job card is signed off and a Certificate of Occupancy is issued. This certificate is required before the ADU can be legally rented. Even if the unit is fully built, it cannot be leased without this final approval.