ADU Resource Center

The process · Permitting

Permitting is the scariest word in the ADU world. It shouldn’t be.

“Permits” conjures a bureaucratic monster — endless forms, a city that says no, months of mystery. But once you see it laid out, permitting stops being a monster and becomes what it actually is: a sequence of predictable, manageable steps. Here’s the whole roadmap, start to finish.

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Newly built modern detached ADU with cedar siding, glass sliders and a concrete patio

The reframe

A monster, or a checklist?

The fear of permitting comes almost entirely from the unknown. You can’t plan around a process you can’t see, so it grows in your imagination into something enormous and unpredictable.

But permitting isn’t unpredictable — it’s one of the most structured parts of the entire build. There are seven steps. They happen in order. Each one has a clear purpose and a clear finish line. Once you can see all of them at once, the monster turns into a checklist.

The roadmap

Seven steps, plans to keys

This is the whole journey — the same path every legal ADU in California travels.

  1. 1

    Design & plans

    The drawings the city needs to understand exactly what you’re building — floor plans, elevations, site plan, and the details in between. Getting these right is where delays are won or lost. Clean, complete plans move; vague ones bounce.

    Where most timelines are decided

  2. 2

    Engineering

    Structural calculations that prove the build is sound — foundation, framing, load paths. These get bundled with your plans so the whole package lands on the reviewer’s desk together, not in pieces weeks apart.

    Bundled for a clean submittal

  3. 3

    Submittal & plan check

    You hand the package to the city and they review it against code. They may return a list of corrections. This back-and-forth is normal — it’s not a rejection, it’s the process working as designed.

    Comments are expected, not a failure

  4. 4

    Corrections & resubmittal

    You answer the city’s comments and resubmit. Experienced teams anticipate most of these before the first submittal, so they clear them in fewer cycles — days of back-and-forth instead of months.

    Fewer cycles = faster approval

  5. 5

    Permit issued

    The city signs off on your plans and issues the permit. This is your green light — legal approval to break ground and build.

    Your green light to build

  6. 6

    Construction & inspections

    Building begins. The city inspects at key milestones — foundation, framing, electrical, plumbing, and more. Pass each inspection, keep moving. Each one is a checkpoint, not a hurdle.

    Checkpoints along the way

  7. 7

    Final sign-off

    The last inspection passes and the city issues final approval. Your ADU is now legal, finished, and ready to live in or rent out. Done.

    Legal, finished, ready

The honest truth

Why some sail through and others stall

Here’s what nobody tells you: the single biggest cause of “my permit took forever” isn’t the city being slow. It’s incomplete or amateur submittals that trigger round after round of corrections — a preventable, self-inflicted delay.

Incomplete submittals

Plans missing details the city always asks for. Each gap becomes a correction, and each correction restarts the review clock.

Amateur drawings

Plans that don’t speak the city’s language trigger round after round of comments — the single biggest cause of “my permit took forever.”

Not knowing the city

Every jurisdiction has its own quirks. Missing a local requirement you didn’t know existed sends you straight back to the queue.

Slow correction turnaround

When corrections sit for weeks before they’re answered, the delay isn’t the city — it’s the wait on your side of the desk.

The difference between a project that sails through and one that stalls isn’t luck. It’s experience: complete, code-compliant plans, knowing your specific city’s requirements, and turning corrections around in days, not weeks.

You shouldn’t have to become a permit expert. You should be able to hand it to someone who already is.

What this means for you

You don’t have to walk it alone

Now that you can see all seven steps, the path is no longer a mystery — but that doesn’t mean you have to walk it yourself. The homeowners who move fastest aren’t the ones who became experts. They’re the ones who handed the roadmap to a team that has run it hundreds of times.

That’s the whole idea: the same process, run on someone else’s experience instead of your learning curve — so the anticipated corrections are already handled and the city’s comments come back to people who know exactly what to do with them.

Questions

Permitting, answered

Still have a question? Ask us during your free consultation.

How long does ADU permitting take in Los Angeles?

It varies by city and by how clean your submittal is, but a well-prepared package typically moves through plan check in a matter of weeks per cycle rather than months. The biggest variable isn’t the city’s speed — it’s how many correction cycles you trigger. Complete, code-compliant plans that clear review in one or two rounds are dramatically faster than plans that bounce back four or five times. That difference — not luck — is why some homeowners are under construction while their neighbors are still resubmitting.

What actually causes permit delays?

Almost always the same thing: incomplete or amateur submittals that trigger round after round of corrections. It’s a preventable, self-inflicted delay. Plans that are missing details, don’t reflect local code, or ignore a specific city requirement all get kicked back — and every kickback adds weeks. Delays caused by the city itself are far rarer than most homeowners fear. Get the package right the first time and the process moves the way it’s supposed to.

Do I really need structural engineering?

For most ADU projects, yes. Structural calculations prove to the city that the build is sound — that the foundation, framing, and load paths meet code. Engineering isn’t red tape; it’s what lets the reviewer approve your plans with confidence. The good news: when it’s bundled into your submittal package from the start, it’s just one more piece that’s already handled, not a separate hurdle you chase down later.

What are corrections, and are they a bad sign?

Corrections are the city’s written comments on your plans after they review them — clarifications, code items, or details they want addressed before they’ll issue the permit. They’re completely normal and not a rejection. The goal isn’t zero corrections; it’s clearing them fast and in as few cycles as possible. Experienced teams anticipate most of the common comments before the first submittal, so the ones that do come back get turned around in days.

Can you handle the permitting for me?

Yes — that’s exactly the point. You shouldn’t have to become a permit expert to build an ADU. Our team prepares complete, code-compliant plans, bundles the engineering, submits to your city, and turns corrections around fast — so the roadmap runs on our experience instead of your learning curve. Start with a free consultation and we’ll walk you through how the process looks for your specific property and city.

Keep learning

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See how the roadmap looks in your city

Every city runs permitting a little differently. Book a free consultation and we’ll walk you through exactly how the process looks for your specific property and jurisdiction — the timeline, the requirements, and where the shortcuts really are. No obligation, just clarity.