
ADU Construction Timeline: How Long It Really Takes to Build an Accessory Dwelling Unit
The typical ADU construction timeline ranges from six to twelve months, though the schedule can vary depending on the permitting process, design complexity, and site conditions. Building an ADU involves a structured sequence of planning, approvals, and construction work. Understanding the ADU building process helps homeowners prepare for the entire process and set realistic expectations. While every project is unique, most ADU projects follow similar phases that guide the project from the first conversation through final inspections and occupancy. Careful planning, local expertise, and proactive communication with the right team can help minimize delays and keep the project moving smoothly.







