The complete document checklist for a City of LA ADU permit application — every plan, stamp, and form LADBS expects in your ePlanLA package. Get it right and the approval clock starts. Get it wrong and you wait. We'll show you the list, then match you with a vetted, licensed builder who assembles it for you.
See if your property qualifies — freeWe match you with vetted, California-licensed ADU builders in your area — no guesswork, no cold-calling contractors.
Almost every stalled ADU project in Los Angeles dies in the same place: an incomplete submittal. You file with LADBS, wait weeks, and instead of a plan-check review you get a list of what's missing — and the clock you thought was running never actually started. This page is the antidote: a complete, plain-English LADBS ADU submittal checklist covering every plan, stamp, and form your ADU permit application needs before it goes into ePlanLA, the city's online permitting portal.
One thing up front, because it shapes everything below: 1-800-ADU-Pros is a vetted directory and pre-qualification service, not a contractor. We don't draw plans, stamp drawings, or file permits — the independent, California-licensed builder you choose does all of that, and assembling this exact package is a core part of what they handle. Our job is to confirm your lot can support an ADU and match you to a pre-screened pro. Think of this checklist as a window into the work the right builder takes off your plate. For the full permitting walkthrough, start with our LA ADU permit guide.
A complete LADBS ADU submittal package includes: architectural plans (floor plans, elevations, sections), a site/plot plan showing setbacks and existing structures, structural plans with a licensed engineer's stamp, Title 24 / CF-1R energy compliance documents, grading & drainage details, MEP/utility details (water, sewer lateral, electrical service), and supporting docs (a ZIMAS printout or survey, the LADBS application forms, and owner authorization). Why it matters: under SB 543 (effective Jan 1, 2026) LADBS must make a completeness determination within 15 business days, and the 60-day SB 13 review clock only starts once your package is deemed complete. Completeness is the whole game.
Two California statutes govern your ADU timeline. Only one of them starts when you hit "submit" — and it isn't the one you think.
Here's the sequence most homeowners don't understand until it costs them weeks. When you file an ADU permit application, LADBS first runs a completeness determination: a check of whether your package contains everything required to actually review it. Under SB 543, effective January 1, 2026, the city must make that call within 15 business days. If anything on the checklist below is missing, they deem the application incomplete and send it back with a list — and you start over.
The 60-day ministerial review window everyone quotes comes from SB 13. But that 60-day clock only starts once your application is deemed complete. An incomplete package is the single biggest reason that clock never starts — which means the fastest way to a permit isn't rushing the submission, it's submitting a package with zero gaps the first time.
Treat the 15-business-day completeness window as a pass/fail gate, not a review. LADBS isn't grading your design at this stage — they're only checking that every required item is present. A package that's 95% there still gets bounced. The leverage is brutal but simple: a fully complete first submission can save you a full correction cycle (often 4–6 weeks) versus a package that's one stamped sheet or one form short.
The seven core components of a complete ePlanLA package. Work top to bottom — each one is a separate deliverable, and a gap in any of them stops the clock.
The heart of the set. Floor plans show room layout, dimensions, door/window locations, and square footage; elevations show each exterior face with heights and finishes; building sections cut through the structure to show wall assemblies, ceiling heights, and roof framing. These must be drawn to scale and reflect current City of LA code and ADU size limits.
A scaled overhead drawing of your entire property: lot lines and dimensions, the existing house, the proposed ADU footprint, and every setback measured (4 ft side and rear for a detached ADU in LA). It must show driveways, existing structures, distances between buildings, and how the new unit complies with coverage and separation rules. Pull your lot data from ZIMAS to get the dimensions right.
Foundation plans, framing plans, and structural details — sized and stamped by a California-licensed civil or structural engineer (or architect of record). The wet/digital stamp is non-negotiable; LADBS will not deem a package complete without sealed structural sheets and the accompanying structural calculations. This is one of the most common items DIY filers leave out.
California's Title 24 energy code applies to new ADUs. Your set needs an energy compliance report — for residential work this is typically the CF-1R (Certificate of Compliance) — documenting insulation values, fenestration (windows), HVAC, and lighting against the state standard. It's a discrete document that gets uploaded with the plan set, not something the plan checker infers from your drawings.
For detached units and sloped lots especially, LADBS wants to see how the site drains and whether any grading is involved — finished floor elevations, lot slope, drainage flow away from structures, and any retaining. On flat lots this can be light; on hillside or hazard-flagged parcels (which ZIMAS will reveal) it can be a substantial sub-set with its own review.
Mechanical, electrical, and plumbing plans plus the utility connections that tie the ADU into your property: the water line, the sewer lateral connection (or septic, where applicable), and the electrical panel/service — including whether your existing panel has capacity or needs an upgrade. Utilities and sitework are the most under-budgeted part of an ADU at roughly 10–15% of total cost, so getting these details right early protects your budget as well as your timeline.
The paperwork that frames the plans: a property survey or ZIMAS printout confirming zoning and lot data, the completed LADBS permit application forms, and owner authorization if anyone other than the owner (i.e., your builder or designer) is filing as applicant of record. Missing forms or an unsigned authorization will fail the completeness check just as fast as a missing plan sheet.
The vetted builders in our network draw the plans, secure the engineer's stamp, run Title 24, and file a complete ePlanLA package for you. First, let's confirm your lot can even support an ADU.
See if your property qualifies — freeThe same checklist in table form — print it, or hand it to whoever's pulling your package together.
| Submittal item | What it must show |
|---|---|
| Architectural plans | Floor plans, all elevations, sections |
| Site / plot plan | Setbacks, lot dimensions, existing structures |
| Structural plans | Foundation & framing, engineer's stamp + calcs |
| Title 24 energy compliance | CF-1R report (insulation, windows, HVAC) |
| Grading & drainage | Slope, finished floor elevations, drainage |
| MEP / utilities | Water, sewer lateral, electrical panel/service |
| ZIMAS printout / survey | Zoning, overlays, verified lot data |
| Application forms | LADBS permit application, complete |
| Owner authorization | Required if builder/designer files on your behalf |
A few notes that save headaches. Keeping your ADU under 750 sq ft exempts it from impact fees by state law (CA HCD), which is worth weighing while your plans are still on the table. And if speed is the priority, a LADBS pre-approved standard plan ships with much of this set already reviewed — shrinking both the package you assemble and the time in plan check. For the bigger picture on why the statutory timelines rarely match reality, see the 60-day approval law vs. reality.
If LADBS deems your application incomplete, it's almost always one of these. Each one means starting the 15-day clock over.
The pattern is clear: completeness failures are rarely about design quality — they're about assembly. Every item is present and properly stamped, or it isn't. That's exactly the kind of disciplined package an experienced LA ADU builder produces routinely, because they've cleared the LADBS completeness gate dozens of times. Unsure which rules apply to your specific lot before any of this gets drawn? That's what the free qualification check below is for.
We'll check your address, zoning, lot size, and setbacks for free and tell you straight whether an ADU pencils — then connect you with a vetted LA builder who assembles and files the full ePlanLA submittal for you.
See if your property qualifies — freeThe most common regret we hear: "I thought I'd just upload some plans — I had no idea it was this many separate, stamped documents." Here's the alternative.
1-800-ADU-Pros is a vetted directory of California-licensed LA ADU builders. We're not a contractor and we don't hold a license, and we don't pull permits — the independent builders we match you with do all of that, and each one's CSLB license number is shown on their profile. The builder you choose runs ZIMAS, draws the architectural set, coordinates the engineer's stamp and Title 24, prepares the grading and MEP details, completes the forms, and files the complete package through ePlanLA as the applicant of record. The submittal headache this page just walked you through is, start to finish, their job — not yours. Here's the two-step path to get there:
From there, the builder handles the full submittal, the plan-check corrections, and inspections through your Certificate of Occupancy — design, permit, and build under one roof. New to the permitting process entirely? Start with our LA ADU permit guide, or if you already have an unpermitted unit, see how to legalize it.
The questions LA homeowners ask most before they file.
Before you spend a dollar on permits, let us check your address — zoning, lot size, setbacks, overlays — and tell you straight whether an ADU is viable. If it looks good, we connect you with a vetted, California-licensed LA builder for a free on-site feasibility assessment. No cost, no commitment.
By submitting, you agree to be contacted by phone, text, and email about your project. Consent is not a condition of purchase. Msg & data rates may apply.