Pre-approved ADU plans skip most of plan check — so the permit that drags out for months on a custom design can clear LADBS in roughly 21–30 days. Here's how the program works, the honest tradeoffs, and how to tell if a standard plan fits your lot.
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If you've been quoted a multi-month permit timeline for your ADU, the LADBS Standard Plan Program is the single biggest lever you have to shrink it. A standard plan — sometimes called a pre-approved ADU plan — is a complete ADU design that has already cleared the citywide plan check. Because the building department has reviewed the structure, energy compliance, and code conformance once, it doesn't have to do it again for every homeowner who builds it. That's why these plans can be permitted in roughly 21–30 days instead of the 2–4 months a custom design typically runs through LADBS.
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, pull permits, or build — independent, California-licensed builders do that. What we do is confirm whether your lot can support an ADU, then match you to a pre-screened, CSLB-licensed LA builder who can tell you whether a standard plan fits your property and handle the submittal either way.
A standard (pre-approved) ADU plan is a design LADBS has already reviewed and approved citywide, so your application skips the slow structural/energy/code review and only needs a site-specific check — plot plan, foundation/soils, and utility tie-ins. That's why standard plans permit in ~21–30 days versus ~2–4 months for custom. State law AB 1332 requires cities to pre-approve standard ADU plans and to approve a standard-plan permit within 30 days. The catch: you give up layout flexibility, and the plan must actually fit your lot and setbacks.
A library of pre-reviewed ADU designs that have already passed the citywide plan check — once, for everyone.
The City of Los Angeles maintains a published catalog of approved standard ADU plans through LADBS. Each design in the program has been submitted by an architect or design firm, reviewed against the building code, energy code (Title 24), and structural requirements, and stamped as conforming — before any individual homeowner picks it. When you choose one of these pre-approved ADU plans in LA, you're essentially buying into a design the city has already blessed.
That changes the nature of your permit. Instead of LADBS reviewing your project from a blank page, the plan-check team only has to confirm that the pre-approved design is being placed correctly on your specific lot. The heavy, slow review — the part where a plan checker reads every sheet and issues correction after correction — has already happened. You inherit the result.
It's worth being precise about what's pre-approved and what isn't. The building itself — floor plan, wall sections, structural framing, energy compliance — is the approved part. The way it sits on your property is not, and never can be, because every lot is different. We'll get into exactly what still gets reviewed in the section below.
It's not a shortcut or a loophole — it's that most of the review is already done.
On a custom ADU, the bulk of the permit timeline isn't the city being slow for no reason — it's the plan-check correction loop. A plan checker reviews your drawings against code, issues a list of corrections, your team revises and resubmits, and the cycle repeats one to three times. Each round routinely adds four to six weeks. That loop is exactly what a standard plan eliminates: the design has already survived it.
There's also a legal accelerant. AB 1332 requires California cities to develop a program of pre-approved standard ADU plans and to approve a permit application that uses one within 30 days. So the speed isn't just a courtesy from LADBS — for a standard-plan submittal, the 30-day turnaround is what the state expects. In practice, LADBS turns these around in roughly 21–30 days once the site-specific package is complete.
Contrast that with the custom reality. The 60-day approval clock in state law (SB 13) is widely missed for custom builds — the UC Berkeley Terner Center measured LA County at 147 days application-to-permit outside the coastal zone, and 260 days inside it. A standard plan is the most reliable way to stay on the fast end of that spread. (For the full reality check on permit timelines, see our deep dive on the 60-day ADU approval law.)
A standard plan removes the design review, not the whole permit. You still file a complete application, the city still runs a 15-business-day completeness check (required under SB 543, effective January 1, 2026 — VerifiedADU), and your site-specific sheets still get reviewed. The 21–30 days is real, but it's a real review window, not a same-day stamp.
Five stages from picking a design to a building permit — with the slow custom step deleted.
Browse the LADBS approved standard plans catalog (or a builder's pre-approved set) and choose a footprint and bedroom count that physically fits your yard within the 4 ft side/rear setbacks. This is the make-or-break step: the design only stays "fast" if it actually drops onto your lot without modification.
You still need a project-specific plot/site plan showing where the unit sits, plus foundation and soils details for your ground conditions and utility tie-in plans (water, sewer lateral, electrical). The pre-approved building drawings get attached as-is; this site layer is what your team actually produces.
The application goes in electronically through ePlanLA, flagged as a standard-plan submittal. A licensed builder or designer normally files as the applicant of record and pays the initial plan-check fees.
Because the building is pre-approved, LADBS reviews only the lot-specific sheets — placement, setbacks, foundation/soils, drainage, and utility connections. This is dramatically narrower than a full custom plan check, which is the entire reason for the 21–30 day turnaround under AB 1332.
You pay the balance of city fees and LADBS issues the building permit. ADUs under 750 sq ft are exempt from impact fees by state law (CA HCD). From here, construction runs through normal phased inspections to your Certificate of Occupancy — the standard-plan advantage was on the permit side, not the build side.
That's the first question, and it's answerable from your address. We'll check your zoning, lot size, and setbacks for free and tell you straight whether a pre-approved plan pencils — then connect you with a vetted LA builder who works with them.
See if your property qualifies — freeThe same trade most LA homeowners weigh: speed and cost on one side, flexibility on the other.
| Aspect | Standard plan | Custom design |
|---|---|---|
| Permit time | ~21–30 days | ~2–4 months |
| Plan-check rounds | Site review only | 1–3 correction rounds |
| Layout flexibility | Fixed footprint | Fully tailored |
| Design cost | Lower (reused plans) | Higher (from scratch) |
| Best for | Standard lot, speed-first | Tricky lot, specific needs |
The numbers above are LA-typical ranges, not a quote — your timeline still depends on a complete submittal and your specific LADBS district. The point of the comparison isn't that one is "better"; it's that they solve different problems. A standard plan is the right tool when your lot is reasonably conventional and your priority is getting permitted and built quickly for less money. A custom design earns its longer timeline when your lot is constrained, sloped, or unusually shaped, or when the layout genuinely matters — an aging parent who needs a specific accessibility setup, say. Construction cost per square foot (roughly $250–$400/sq ft in LA) is similar either way; the savings on a standard plan come mostly from the design and permitting side, not the build. For the full cost picture, see our LA ADU cost guide.
Standard plans are genuinely fast and cheaper — but they aren't free of strings. Here's what you're actually giving up.
None of these are deal-breakers for most homeowners — they're the normal price of speed. But you should go in knowing them, not discover them mid-project. A good builder will tell you within the first conversation whether a standard plan is realistic for your lot or whether you'll be better served going custom.
A simple framing: match the tool to your lot and your priorities.
Lean toward a standard plan if: your lot is a fairly conventional shape with room for a detached unit inside the setbacks, your priority is getting permitted and built quickly and affordably, and you're comfortable with one of a set of proven floor plans rather than a bespoke one. This describes the majority of single-family LA lots, which is exactly why the program exists.
Lean toward custom if: your lot is small, sloped, irregularly shaped, or has access constraints; you have specific layout needs (multigenerational living, accessibility, a home office, a particular kitchen or bath configuration); or you simply want a one-of-a-kind design and are willing to trade a few extra months of permitting for it.
The honest truth is that you often can't tell which camp you're in until someone checks your specific property — whether a given pre-approved footprint actually fits within your setbacks is a question about your lot, not about the program in general. That's precisely the gap our free qualification check closes: we pull your address, assess zoning, lot size, and setbacks, and tell you straight whether a standard plan is viable before you commit to anything. If you want to see everything that goes into a complete filing either way, our LADBS ADU submittal checklist walks through it, and the broader process lives in our LA ADU permit guide.
We'll check your zoning, lot size, and setbacks for free and tell you straight whether a standard plan pencils — then connect you with a vetted, licensed LA builder for an in-person feasibility assessment.
See if your property qualifies — freeWhat LA homeowners ask most before choosing a standard plan.
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.
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