Construction is the stage where plans become a physical home, and knowing what to expect turns a stressful few months into a manageable, even exciting, process. A well-run ADU build follows a predictable sequence: site preparation, foundation, framing, the roof and weather envelope, rough-in of plumbing and electrical, inspections at each milestone, then insulation, drywall, finishes, and a final inspection that clears the unit for occupancy. Understanding that rhythm helps you see progress for what it is and know when key decisions are due.
How long it takes depends on the type of build. A garage conversion, which reuses an existing structure, moves faster than a ground-up detached unit that starts with a new foundation. Site conditions matter too — access, grading, and utility distances can add or remove weeks. What consistently protects a timeline is coordination: keeping trades in the right order, scheduling inspections so work isn't reopened, and solving problems before they cascade.
This is the part of the journey where an owner-led builder makes the biggest difference. At Vision ADU, the same people who sold you the project are involved in building it — Barak, Jaime, and Iris stay hands-on through construction, and our bilingual English/Spanish team means clear communication on every job site. Drawing on Barak and Jaime's 30+ years of combined construction experience, we sequence the work to hold the schedule and to pass inspections cleanly the first time, which is the real driver of an on-time finish.
The guides in this stage walk through preparing your property for construction, how long an ADU takes to build, and a detailed how-to-build series covering architecture and design, city submittal, the start of construction, and final inspection. Read them so you know what each phase involves and what your builder should be handling on your behalf. When you're ready to start, book a consultation and we'll walk you through the exact sequence for your project — and then execute it.
Ready to break ground? Our owner-led team will map the exact construction sequence for your project.
Book Your Build ConsultationGuides in This Stage
How to Prepare Your Property for ADU Construction
Everything you need to do before ADU construction starts -- from utility checks and tree removal to neighbor communication and temporary storage solutions.
How Long Does It Take to Build an ADU? Realistic Timeline Breakdown
Get an honest, phase-by-phase breakdown of ADU construction timelines in Los Angeles and Orange County. Learn what causes delays and how to avoid them.
How to Build an ADU, Day 1: Architecture & Design
The journey to your dream ADU starts with great design. Learn how architects create plans that maximize space, comply with local codes, and bring your vision to life.
How to Build an ADU, Day 4: City Submittal & Permits
Navigating city hall is one of the most stressful parts of building an ADU. Here's how the permit process works and how to get approved faster.
How to Build an ADU, Day 5: Start of Construction
Permit in hand, it's time to break ground. Here's what happens during the first days of ADU construction — from site prep to demolition.
How to Build an ADU, Day 17: Final Inspection & Keys
The finish line! Learn what happens during the final building inspection, how to get your Certificate of Occupancy, and what it's like to get the keys to your new ADU.