Real LA permit timelines: what LADBS actually takes vs. what they advertise

LADBS publishes a target of 60 days for residential plan check. Most other LA permit guides repeat that number without context. The actual experience of pulling an ADU permit in LA looks nothing like 60 days. Custom ADU permits average 4 to 7 months from initial submittal to building permit issuance. Hillside, HPOZ, or multi-overlay projects can hit 9 to 12 months. Here's what the published target actually means, where the time goes, and how to estimate your own project realistically.

What "60 days" actually refers to

LADBS's 60-day target is for the FIRST plan check review only. It measures the time from when your submittal arrives at plan check to when the engineer returns it with their initial response, which is almost always a list of corrections, not an approval.

You then have to address those corrections (anywhere from 1 to 8 weeks depending on complexity), resubmit, and wait for the second review. Then a third. Then a fourth. Each correction cycle resets the queue.

For a clean project with only minor corrections, you might hit 3 cycles total: ~90-120 days of LADBS time, plus your time to respond. For a project with substantive corrections, 5+ cycles is common.

Where the real timeline goes (week by week)

For a typical custom ADU on a standard LA lot with no major overlays, here's what 4-6 months actually looks like:

Weeks 1-4: design + drawings. Your architect or designer completes site plan, floor plans, elevations, foundation plan, structural calcs, energy compliance forms. Faster if you're using a pre-approved standard plan (1-2 weeks for site adaptation only).

Weeks 5-6: pre-submittal review (optional but recommended). Walk into a LADBS field office (West LA or Van Nuys for most addresses) for a counter review. They flag obvious issues so you don't submit and immediately get corrected. Skip this and you'll usually pay for it in extra correction cycles later.

Weeks 7-8: submission + intake. Submit through PermitLA online portal. LADBS intake reviews for completeness, missing forms or wrong fee classifications come back here. Once accepted, you're in the plan check queue.

Weeks 9-14: first plan check review. Engineer reviews. Returns with corrections. This is the "60-day target" being honored or missed.

Weeks 15-18: address corrections. Your designer revises drawings, recalculates structural where needed, addresses any zoning questions. Resubmit.

Weeks 19-22: second plan check review. Most projects clear here. Some need a third round.

Weeks 23-24: permit issuance. Pay fees, get the building permit.

Total: roughly 24 weeks / 6 months for a relatively clean project.

What adds time

Hillside Area designation. Adds 4-8 weeks for the geotechnical / soils report cycle. The geologist needs 4-6 weeks to investigate + write the report; plan check needs additional time to review the report. Soils report turnaround is the single most common cause of timeline overruns on hillside projects.

HPOZ. Adds 2-4 months for Office of Historic Resources review. Most projects clear OHR staff review (2-4 weeks); projects that go to the HPOZ Board add another 4-8 weeks. Highland Park, Hancock Park, Whitley Heights all see this regularly.

Coastal Zone. Adds 3-6 months for the Coastal Development Permit. Venice, Mar Vista west of Lincoln, Pacific Palisades, Malibu all in the zone.

Mulholland Scenic Parkway Specific Plan. Adds 4-8 weeks for Planning Department design review. Affects ridge lots in Brentwood, Bel Air, Hollywood Hills, Studio City south side.

Multi-overlay stacking. A hillside HPOZ lot adjacent to Mulholland gets ALL of these delays in series. 9-12 month timelines are routine for these projects.

Plan correction quality. A first submittal that's incomplete or low-quality gets more correction cycles. Each cycle is 2-4 weeks of LADBS time plus 1-3 weeks of your designer's response time. Bad first submittal = 6-9 month timeline. Good first submittal = 4-5 month timeline.

What cuts time

Pre-approved standard plans. The City's YOU-ADU plan and the 80+ LADBS-licensed designer plans (ADU1 through ADU96) qualify for streamlined plan check. Many issue same-day if the site adaptation is clean. Total project timeline can drop to 6-10 weeks from contract to building permit.

Express Plan Check. LADBS offers a paid expedited review service, typically 50% more than standard plan check fees in exchange for faster turnaround. Useful for time-sensitive projects but not always available for every project type.

SolarAPP+ (for solar projects specifically): automated permit issuance for compliant residential solar. Most projects clear in minutes, not weeks.

Counter Plan Check / Express Permits (for smaller projects): some accessory permits like new windows or HVAC replacements can be approved over-the-counter same-day at LADBS field offices.

How to estimate your project realistically

Start with the base 4-6 month custom-ADU number. Add for overlays:

• Hillside: +1 month
• HPOZ: +2 months
• Coastal Zone: +4 months
• Mulholland SP: +1 month
• Multiple overlays stacked: +50% on the total

So a custom ADU in hillside Sherman Oaks: 5-7 months base + 1 month hillside = 6-8 months. A hillside HPOZ project in Highland Park: 5-7 months + 1 + 2 = 8-10 months. A coastal hillside ADU in Pacific Palisades: 5-7 + 1 + 4 = 10-12 months.

Subtract for pre-approved plans: -3 to -4 months. So a YOU-ADU on a clean flat lot can hit 2-3 months total.

Common timeline mistakes homeowners make

Believing your contractor's "we can get it permitted in 90 days" line. Some contractors quote optimistic timelines to win the contract. Sometimes they make it work; usually they don't. Ask for THREE recent LA ADU permits they've pulled, with actual permit issuance dates. The dates tell the story.

Forgetting the corrections-response time is on YOU. If LADBS returns corrections in week 14 and your designer is busy with other projects, you might not respond until week 17. That's 3 weeks added to the timeline that's not LADBS's fault. Keep your designer engaged through the review cycle, not just the design phase.

Skipping pre-submittal counter review to "save time." This almost always costs time, not saves it. A 30-minute counter visit catches issues that would otherwise return as 4-week correction cycles.

Not budgeting carry costs. Permit time is also financing time, construction-start delay time, and rent-while-you-wait time. A 6-month permit timeline adds real cost beyond the design fees. Budget accordingly.

What this means for your project planning

If your contractor or expediter quotes you a timeline shorter than 4 months for a custom ADU, ask what permit type they're using. If it's not a pre-approved plan, the timeline is optimistic.

If you're at the start of a custom project: build a 6-month timeline into your financial planning and rent-or-stay decisions. Anything shorter is upside.

If you want a faster path, the YOU-ADU pre-approved plan is the single biggest timeline lever in LA. We cover it in detail at /standard-plans/city-of-los-angeles.

Sources

• LADBS plan check turnaround targets: ladbs.org/services/check-status
• PermitLA public permit dataset (rolling 2-year window of issued ADU permits)
• LADBS Standard Plan Program documentation

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