Permitting · 7 min read · March 28, 2025 · 403 words
The LA ADU permit timeline, week by week
From signed agreement to building permit in 14–22 weeks: what happens, who is doing it, and the three places projects stall.
Key takeaways
- Lock financing (HELOC, cash-out refi, or renovation loan) by week 8 — start with the [financing playbook](/guides/financing-an-adu-without-overpaying).
- Choose finishes by week 10 so material lead times don't push your construction start.
- Notify neighbors by week 12 — courtesy goes a long way before trucks arrive.
Answered in this guide
Jump straight to the question you came in with — every answer is on this page, with links onward to the deeper guide.
- What is SB-9 and does it apply to me?
- What about hillside or coastal lots?
- I'm in an HPOZ — can I still build?
- How long does an ADU project take in Los Angeles?
- Can I move faster with a pre-approved standard plan?
- Do you handle the permitting?
More across the studio · the full FAQ map · the reference desk
State law caps LADBS' review of a compliant residential ADU at 60 days. In practice, the calendar from signed contract to permit-in-hand runs 14 to 22 weeks because the work that surrounds plan check — design, engineering, corrections — is what actually consumes the time. The 2025 LA permitting rulebook explains the statute behind the clock.
Weeks 1–4: discovery and design development
The first month is interviews, site survey, soils report (if required), and a schematic design package. By end of week four you should have a floor plan, exterior elevations, a placement diagram showing setbacks, and a hard cost estimate within ±8% — the same buckets the cost anatomy guide breaks down.
Weeks 5–9: construction documents and engineering
Construction drawings are produced in parallel with structural, Title 24, mechanical, electrical and plumbing calculations. This is where the most time gets compressed if your design team has done it many times — and where it expands by 4–6 weeks if they haven't.
Weeks 10–18: plan check (LADBS)
First-round plan check returns in 4–6 weeks for ADUs. Clean submittals clear in one corrections cycle; complicated lots take two or three. Hillside, historic overlay, and high fire-severity zone projects can extend this window by 4 weeks each.
Weeks 18–22: clearances and issuance
Once plan check approves, the permit moves to school district fee assessment, sewer capacity confirmation, utility coordination, and final fee collection. This is largely paperwork — but each clearance has its own queue and any one of them can add a week. The LADWP and SoCalGas walkthrough maps the utility side.
What you should do in parallel
- Lock financing (HELOC, cash-out refi, or renovation loan) by week 8 — start with the financing playbook.
- Choose finishes by week 10 so material lead times don't push your construction start.
- Notify neighbors by week 12 — courtesy goes a long way before trucks arrive.
Sources
- AB 1332 — 60-day plan review preempted · California Legislature
- LADBS Plan Check & Permit · LA Department of Building and Safety
- Statewide ADU Standards — Gov. Code §65852.2 · California Legislature
- California ADU Handbook (2024) · California HCD
Next chapter · 01 of 03
Permitting · 11 min read
The 2025 LA ADU permitting rulebook, decoded
The 2025 rulebook behind every line in the timeline — what the state preempted, what LA still controls, what changed this year.
What [LADBS](https://www.ladbs.org/) and California's HCD actually require in 2025 — by-right approvals, setbacks, owner-occupancy, and the rules that quietly changed this year.
FAQ · Permitting
Common questions on permitting
The questions readers send us most after this guide.
What is SB-9 and does it apply to me?
SB-9 (the California HOME Act) lets eligible single-family lots split into two parcels and/or add a duplex. We assess eligibility during the feasibility call — roughly 60% of LA single-family lots qualify on paper, fewer in practice once HPOZ, hillside, and coastal overlays are applied. SB-9 projects can stack with an ADU for up to four units on what was a single-family lot.What about hillside or coastal lots?
Hillside requires a Methane District review (where applicable) plus a haul route plan if grading exceeds 1,000 cubic yards. Coastal Zone projects (anything west of Lincoln Blvd in Venice, for example) need a Coastal Development Permit on top of standard LADBS approval. Both are workable; both add 60–90 days.I'm in an HPOZ — can I still build?
Yes, but with design review. Historic Preservation Overlay Zones require Certificate of Appropriateness from the cultural heritage commission before permits issue. We've shepherded projects through Miracle Mile, West Adams, Whitley Heights, and Spaulding Square HPOZs. Add 8–12 weeks for the COA process.How long does an ADU project take in Los Angeles?
Most detached ADUs run 9–13 months from contract to certificate of occupancy. Garage conversions are typically 4–6 months. Permitting alone is usually 60–120 days at LADBS depending on whether we use a pre-approved standard plan or a custom design that needs full plan check.Can I move faster with a pre-approved standard plan?
Yes — meaningfully. LADBS Standard Plan ADUs skip the design review portion of plan check and often clear permitting in 30–60 days instead of 90–120. We carry a curated library of standard plans from 480 to 1,200 sq ft.Do you handle the permitting?
Yes. We file with LADBS or your local building department, manage plan check, coordinate utility upgrades, schedule inspections, and deliver final sign-off. You don't visit the counter, we do.
Reference desk · Permitting
More answers from the California reference desk
City-specific questions pulled from our 5,000-answer FAQ corpus — every link opens a deeper desk page.
How long does a ADU permit take in Beverly Hills?
City of Beverly Hills Community Development runs plan check 120–180 days on a complete, code-conformant submittal for a ADU. First-cycle approvals depend on three things: a stamped structural set, a Title 24 energy report bound into the package, and a site plan with verified setbacks. Most slippage comes from missing one of those three on first submittal.Why do ADU permits get rejected in Beverly Hills?
In Beverly Hills, the five most common first-cycle corrections are: (1) Title 24 energy compliance not bound to the submittal, (2) site plan setback math off by inches, (3) structural calcs not stamped by a CA-licensed engineer, (4) utility load calculations missing for the panel upgrade, and (5) drainage/grading not addressed for impervious-surface adds. Fixing all five before submittal cuts 120–180 days off the schedule.Does state ADU law override Beverly Hills rules for my ADU?
For qualifying ADU and JADU scopes, California Government Code §65852.2 and §65852.22 preempt most local discretionary review — Beverly Hills cannot impose owner-occupancy requirements (banned by AB 976), most parking minimums near transit, or stylistic design review. Local jurisdictions still control building-code application, Title 24, utility connection, and impact fee schedules. Non-ADU scopes (full additions, remodels, hillside builds) remain fully under local control.Are pre-approved standard plans available in Beverly Hills for a ADU?
Where Beverly Hills has adopted a pre-approved standard ADU plan program, using one cuts plan check by 30–60 days and removes the structural review fee. For programs that exist (LADBS, San Jose, San Diego), the trade-off is that floor-plan changes void the pre-approval. Most owners are better off using a standard plan as a starting point and accepting the layout it ships with.How long does a garage conversion permit take in Beverly Hills?
City of Beverly Hills Community Development runs plan check 120–180 days on a complete, code-conformant submittal for a garage conversion. First-cycle approvals depend on three things: a stamped structural set, a Title 24 energy report bound into the package, and a site plan with verified setbacks. Most slippage comes from missing one of those three on first submittal.Why do garage conversion permits get rejected in Beverly Hills?
In Beverly Hills, the five most common first-cycle corrections are: (1) Title 24 energy compliance not bound to the submittal, (2) site plan setback math off by inches, (3) structural calcs not stamped by a CA-licensed engineer, (4) utility load calculations missing for the panel upgrade, and (5) drainage/grading not addressed for impervious-surface adds. Fixing all five before submittal cuts 120–180 days off the schedule.Does state ADU law override Beverly Hills rules for my garage conversion?
For qualifying ADU and JADU scopes, California Government Code §65852.2 and §65852.22 preempt most local discretionary review — Beverly Hills cannot impose owner-occupancy requirements (banned by AB 976), most parking minimums near transit, or stylistic design review. Local jurisdictions still control building-code application, Title 24, utility connection, and impact fee schedules. Non-ADU scopes (full additions, remodels, hillside builds) remain fully under local control.Are pre-approved standard plans available in Beverly Hills for a garage conversion?
Where Beverly Hills has adopted a pre-approved standard ADU plan program, using one cuts plan check by 30–60 days and removes the structural review fee. For programs that exist (LADBS, San Jose, San Diego), the trade-off is that floor-plan changes void the pre-approval. Most owners are better off using a standard plan as a starting point and accepting the layout it ships with.How long does a JADU permit take in Beverly Hills?
City of Beverly Hills Community Development runs plan check 120–180 days on a complete, code-conformant submittal for a JADU. First-cycle approvals depend on three things: a stamped structural set, a Title 24 energy report bound into the package, and a site plan with verified setbacks. Most slippage comes from missing one of those three on first submittal.
Sources & further reading
- California Government Code §65852.2 — statewide ADU framework (ministerial review, 60-day clock).
- LADBS — Accessory Dwelling Unit information bulletins and current permit fee schedule.
- HCD — California Department of Housing & Community Development, ADU handbook (2024 update).
- Internal data: aggregated from real California ADU and residential construction projects, 2018–2025.
Continue your read · the editorial path
We chained these chapters in the order LA homeowners actually need them. Each one picks up where the last one left a question open.
02 / 03
Process · 8 min
How to vet any LA ADU contractor in 8 minutes
A repeatable protocol for verifying license, bond, insurance, and complaint history before you sign anything — using only free public databases.
Read chapter →03 / 03
Process · 8 min
LADWP, SoCalGas and your ADU: the utility connection map
Power, water, and gas hookups account for $8K–$35K of an ADU budget and 4–14 weeks of schedule. A walkthrough of the actual approval paths in 2026.
Read chapter →
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