LADBS Standard Plan Program: 21–30 Day ADU Permits (2026)

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.

The 30-second answer

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.

What's on this page

1. What a standard plan actually is
2. Why it permits in 21–30 days
3. How a standard plan moves through LADBS
4. Standard plan vs. custom
5. The honest tradeoffs
6. Is a standard plan right for you?
7. Standard plan FAQ

What is an LADBS standard plan?

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.

Why standard plans permit in 21–30 days

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.)

Don't confuse "pre-approved" with "instant"

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.

How a standard plan moves through LADBS

Five stages from picking a design to a building permit — with the slow custom step deleted.

1

Pick a pre-approved design that fits your lot

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.

Fit = the whole game

2

Prepare the site-specific package

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.

Plot · foundation · utilities

3

Submit through ePlanLA

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.

Online, no counter trip

4

Site-specific review (the only review left)

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.

Narrow scope = fast

5

Permit issuance & build

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.

Under 750 sq ft = no impact fees

Will a standard plan even fit your lot?

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.

Standard plan vs. custom ADU

The same trade most LA homeowners weigh: speed and cost on one side, flexibility on the other.

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.

The honest tradeoffs

Standard plans are genuinely fast and cheaper — but they aren't free of strings. Here's what you're actually giving up.

• Less layout flexibility. You take the floor plan as designed. You can't move the kitchen, add a second bath, or stretch the footprint without forfeiting the pre-approval — the moment you modify the building, it goes back through normal plan check and the speed advantage evaporates.
• It has to fit your lot and setbacks. The pre-approved building is fixed, so your lot has to accommodate it within the 4 ft side/rear setbacks, height limits, and any overlays. If the design doesn't drop in cleanly, it isn't an option for your property — this is why the lot check comes first.
• You still need site-specific engineering. Pre-approval covers the building, not the ground it sits on. A site-specific plot plan, foundation and soils details, and utility tie-ins (water, sewer lateral, electrical) all still have to be drawn and reviewed. These are also the items most homeowners under-budget — sitework and utilities can run 10–15% of total cost.
• Aesthetic sameness. A pre-approved plan is, by definition, a design other people are also building. If a one-of-a-kind look matters to you, that's a point for custom.

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.

Is a standard plan right for you?

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.

Find out if a pre-approved plan fits your lot

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.

Pre-approved ADU plan questions, answered

What LA homeowners ask most before choosing a standard plan.

How long does a standard-plan ADU permit take in LA?

Roughly 21–30 days once your site-specific package is complete. Because the building design is already pre-approved by LADBS, only the lot-specific sheets get reviewed, which is far faster than the 2–4 months a custom design typically takes. State law AB 1332 requires cities to approve a standard-plan permit within 30 days.

What is the LADBS Standard Plan Program?

It's a published catalog of pre-approved ADU designs that have already cleared the City of Los Angeles plan check for code, structural, and energy compliance. When you build from one of these plans, the city doesn't re-review the design — it only checks that the pre-approved building is placed correctly on your specific lot.

What is AB 1332 and how does it speed things up?

AB 1332 is a California law that requires cities to develop a program of pre-approved standard ADU plans and to approve a permit application that uses one within 30 days. It is the legal reason a standard-plan permit in LA turns around in roughly 21–30 days instead of dragging out for months.

Do I still need engineering and a site plan with a standard plan?

Yes. Pre-approval covers the building itself, not the ground it sits on. You still need a site-specific plot plan, foundation and soils details for your conditions, and utility tie-ins for water, sewer, and electrical. These site-specific sheets are the only part LADBS actually reviews on a standard-plan submittal.

Can I change a pre-approved ADU plan?

Not without losing the speed advantage. The pre-approval applies to the design as drawn. If you modify the building — moving walls, adding a bathroom, or changing the footprint — it goes back through normal plan check and you lose the 21–30 day turnaround. For meaningful layout changes, a custom design is usually the better path.

Is a standard plan or a custom ADU better for me?

A standard plan is best when your lot is fairly conventional and your priority is speed and lower cost. Custom is better when your lot is small, sloped, or irregular, or when you have specific layout needs like accessibility or multigenerational living. The deciding factor is usually whether a pre-approved footprint actually fits within your lot's setbacks, which requires checking your specific property.

Does 1-800-ADU-Pros build the ADU or pull the permit?

No. 1-800-ADU-Pros is a referral and pre-qualification service, not a licensed contractor. We confirm whether your property qualifies and match you with a vetted, California-licensed CSLB builder. That independent builder selects or draws the plans, pulls the permit, and performs the construction, and is listed with their license number on their profile.