ADU Permitting Reality Check: What Homeowners in Los Angeles Should Expect

ADUs are often described as being “approved by right” in Los Angeles, which leads many homeowners to assume the permitting process is quick and straightforward. While ADU-friendly laws have absolutely made it easier to build, they haven’t eliminated the permitting process—or the time it takes to get through it.

The reality is that ADU permitting in Los Angeles is still a detailed, multi-step process that requires careful planning, complete drawings, and patience. Understanding what “by right” actually means can help homeowners avoid frustration and set realistic expectations from the start.

What “Approved by Right” Really Means

When ADUs are described as “approved by right,” it means that a project does not require discretionary approvals such as zoning variances or public hearings if it meets all local and state requirements. It does not mean that permits are issued instantly or without review.

Plans must still comply with building codes, zoning standards, energy requirements, and local ordinances. City reviewers evaluate each submission to ensure it meets these criteria, and most ADU projects receive comments that require revisions before approval.

The Typical ADU Permitting Process in Los Angeles

ADU permitting usually begins after architectural plans and engineering are completed. Once submitted, plans go through a plan check process that includes building, structural, energy, and sometimes fire or utility review. It’s common for homeowners to receive correction notices requesting clarifications or changes, even on well-prepared plans.

After revisions are made and resubmitted, the review cycle repeats until the plans are approved. Only then can construction permits be issued. While some projects move smoothly, others require multiple rounds of review depending on complexity and city workload.

Why Permitting Takes Longer Than Expected

Permitting timelines are influenced by several factors beyond a homeowner’s control. City backlogs, reviewer availability, and interdepartmental coordination can all extend review times. In addition, incomplete plans or missing information can trigger additional comments, pushing approvals further out.

Utility coordination is another common source of delay. Sewer capacity reviews, electrical requirements, and water approvals often happen alongside building review, and each has its own process and timeline.

How Design and Planning Affect Permit Timelines

One of the biggest influences on permitting speed is the quality and completeness of the plans submitted. Projects that begin without thorough design coordination often encounter more corrections, revisions, and delays. Clear documentation, accurate site information, and early consideration of city requirements all help reduce back-and-forth during review.

Homeowners who want a clearer understanding of how planning impacts ADU approvals can explore our Planning an ADU Resource Hub, which outlines the process from feasibility through construction.

What Homeowners Can—and Can’t—Control

While homeowners can’t control city staffing levels or review timelines, they can control how prepared their project is before submission. Early planning, experienced design teams, and realistic expectations go a long way toward minimizing frustration.

What homeowners can control:

• Choosing the right ADU type for their property

• Completing design and engineering before submission

• Responding promptly to plan check comments

What homeowners can’t control:

• City workload and processing times

• Reviewer-specific interpretation of code

• Utility company review schedules

Understanding this distinction helps reduce stress during the permitting phase.

Permitting Is Part of the Investment

While permitting can feel slow, it serves an important purpose. Approved plans protect homeowners by ensuring the ADU is safe, code-compliant, and legally recognized. Cutting corners or rushing this phase often leads to more expensive issues later—both during construction and at resale.

In Los Angeles, permitting isn’t just a hurdle; it’s part of building an ADU that holds long-term value.

Want to Avoid Permitting Surprises?

The best way to minimize ADU permitting delays is to start with realistic expectations and a clear plan. Understanding requirements early helps align design, budget, and timeline before plans are ever submitted.

If you’re considering an ADU and want guidance through the permitting process, we invite you to schedule a planning call. It’s an opportunity to evaluate your property, discuss potential challenges, and understand what your ADU project will realistically involve—before permitting begins.