LA ADU permit trends 2020-2026: what the numbers actually show about LA's ADU boom
Permit volume, timeline, and cost trends for LA ADUs from 2020 through early 2026. Sourced from Cal HCD APR data and LADBS reporting. What drove growth, where it's slowing, and what to expect next.
LA City ADU permits issued went from a few hundred a year in 2018 to over 7,000 a year by 2023. That growth wasn't accidental. It tracks state legislation, fee preemptions, and the gradual maturing of the design-build market. Here's what the data actually shows for 2020 through early 2026, with honest caveats about what the numbers mean.
Quick answer
Annual ADU permits issued in the City of LA per HCD APR data:
| Year | City of LA ADU permits issued | Notes |
|---|---|---|
| 2018 | ~2,400 | AB 68 not yet effective |
| 2019 | ~4,200 | AB 68 signed in September, ramp through Q4 |
| 2020 | ~5,400 | First full year under AB 68 preemptions |
| 2021 | ~6,100 | COVID-era homeowner-equity push |
| 2022 | ~6,800 | Construction cost peak, slight headwind |
| 2023 | ~7,200 | AB 332 streamlining + AB 1033 sale rule |
| 2024 | ~6,800 | Slight cooling, interest rate impact |
| 2025 | ~6,400 (estimated, partial-year data) | Continued rate pressure |
| 2026 (Jan-May) | ~2,700 YTD | Tracking similar to 2025 |
LA County (all jurisdictions including the 88 independent cities and unincorporated areas) typically runs 1.6 to 2.0 times the City of LA number. So total LA County ADU permit volume in 2023 was around 11,500 to 14,000.
The shape of the curve: 3x growth from 2018 to 2023, then a 10-15% pullback in 2024-2026. The growth was legislative (AB 68 + AB 332). The pullback is financial (rates + construction costs). Neither tells the full story alone.
The actual exact figures vary slightly between Cal HCD APR reporting and LADBS's own quarterly reports because the two count slightly different things (HCD counts certificates of occupancy issued, LADBS counts building permits issued, and there's typically a 6-12 month lag between the two). Both sources are publicly available; both tell the same story directionally.
What drove the growth (2018-2023)
Five legislative drivers, in approximate order of impact:
AB 68 (2019) The foundational driver. Removed owner-occupancy mandates for new ADUs, preempted local parking requirements within transit-proximate areas, capped permit fees on smaller ADUs, and forced cities to approve ADU applications by-right within 60 days. LA's annual permit count more than doubled in the first two years after AB 68 took effect.
AB 671 (2019) The state ADU amnesty program. Allowed legalization of unpermitted dwelling units built before January 1, 2018. Many of LA's pre-existing unpermitted garages and basement units became eligible for legal status. Drove a quieter, less-visible stream of permit applications labeled as ADU conversions.
AB 2221 (2022) Tightened setback preemption (4-foot statewide minimum, cities cannot require more) and clarified that cities cannot reject ADUs solely because of nonconforming primary dwellings. Closed a loophole some cities had been using to block ADUs on legacy nonconforming lots.
AB 332 (2023) Required ministerial approval within 60 days. Forced LADBS to streamline review for ADUs that met all preempted requirements. Plan check times for PRADU and YOU-ADU plans dropped from 60+ days to 5-15 days in many cases.
AB 1033 (2023) Authorized cities to permit ADUs to be sold separately as condominiums. LA City has not opted in as of 2026, but the legislation signaled to the market that ADUs were headed toward becoming separately-financeable assets. Some institutional capital began watching LA ADU development more seriously after AB 1033.
SB 1211 (2024) Further removed barriers for multi-family ADU conversions. Less directly relevant for single-family LA homeowners.
What's driven the slowdown (2024-2026)
Three forces, in order of magnitude:
Construction interest rates The Federal Reserve's 2022-2024 rate hikes pushed construction-loan rates from ~5% to ~8-9% by mid-2024. Homeowners refinancing or pulling equity to fund ADUs faced significantly higher monthly costs. Several lenders pulled back from ADU-specific products entirely in 2024.
Construction cost normalization (and stickiness) ADU construction costs in LA peaked in 2022 at $400-$500 per sqft for custom builds. They came down to $300-$400 per sqft by 2024 but didn't drop to pre-2020 levels ($200-$300 per sqft). Materials remain elevated; labor costs have not retreated.
LAUSD school fee at the 750 sqft threshold The 750 sqft trigger for school fees ($4.79/sqft) caused a noticeable bunching of permit applications in the 700-749 sqft range. Many homeowners who would have built 800-900 sqft ADUs settled for 749 sqft to dodge the school fee. This isn't a slowdown in permit count, but it is a slowdown in average ADU size, which affects the actual housing impact.
What permit timelines actually look like
Cal HCD doesn't track permit timelines precisely, but LADBS reports approximate plan-check turnaround data quarterly. Recent ranges:
| Plan path | Median plan check time, 2026 |
|---|---|
| HCD-approved factory-built unit (site work only) | 5-15 days |
| YOU-ADU (City of LA free plan) | 5-15 days |
| PRADU (LADBS pre-approved designer plan) | 5-20 days |
| Custom architect-drawn plan | 60-120 days |
| Hillside / HPOZ / Coastal / VHFHSZ properties | 90-180+ days |
The median has improved meaningfully since 2019, when even simple ADUs commonly waited 90+ days. The improvement is largely AB 332 driving ministerial approval discipline.
The custom-plan timeline has not improved much. AB 332 has less leverage on custom designs because each one triggers full discretionary plan check. If timeline matters more than design flexibility, a PRADU or YOU-ADU path saves 60-100 days.
Cost trends 2020-2026
The honest range for an LA ADU, all-in, by year:
| Year | Typical 500 sqft detached ADU | Typical 1,000 sqft custom ADU |
|---|---|---|
| 2020 | $120K-$180K | $250K-$400K |
| 2021 | $140K-$200K | $290K-$450K |
| 2022 | $170K-$240K | $340K-$520K |
| 2023 | $160K-$230K | $320K-$500K |
| 2024 | $150K-$220K | $300K-$480K |
| 2025 | $150K-$220K | $300K-$480K |
| 2026 | $150K-$225K | $300K-$480K |
The peak was 2022 (post-COVID lumber + labor shock). 2023-2026 has been a slow re-equilibration, not a return to pre-pandemic levels. Lumber prices stabilized but skilled trade labor in LA stayed expensive. See real itemized cost of an LA ADU build and four drivers of LA ADU cost for the breakdown.
Prefab and factory-built ADUs have shown a different trajectory. Companies like Connect Homes, Cover, and ABODU brought prices down 15-20% from 2022 peak to 2025-2026 as their production scaled. A turnkey factory-built ADU in 2026 runs $190K-$350K depending on size and configuration, often beating equivalent site-built construction on price and certainly on timeline.
Where the numbers are headed
Three signals to watch over 2026-2028:
State legislation continues California's legislative momentum on housing supply isn't slowing. Expect further ADU streamlining bills. Probable areas of focus: shorter ministerial approval timelines, broader fee preemptions, and pushing cities to opt into AB 1033 ADU-as-condo sales.
Interest rate normalization If construction loan rates return to 6% or below by late 2026 / 2027, expect a renewed surge in ADU permit applications. The pent-up demand exists; financing is the binding constraint right now.
LA City AB 1033 opt-in LA City Council has not yet opted in to AB 1033 (separate sale of ADUs as condos). If they do, expect a significant shift in financing patterns and a possible surge in ADU construction targeted specifically at the for-sale market. Several other CA cities have opted in already (San Jose, Berkeley, Oakland); LA's eventual decision will reshape the market.
Comparison to other CA metros
City of LA ADU permits issued per Cal HCD APR data, alongside peer metros:
| Metro (city limits) | 2023 ADUs issued |
|---|---|
| Los Angeles | ~7,200 |
| San Diego | ~3,600 |
| San Francisco | ~1,500 |
| San Jose | ~2,400 |
| Oakland | ~1,100 |
| Long Beach | ~900 |
LA is the dominant CA market by absolute volume, but San Diego has been catching up rapidly and San Jose has had the steepest per-capita growth. SF lags primarily due to building stock (multi-family-heavy, less single-family lot availability) and complex local rules.
What the data doesn't tell you
Two important caveats:
Permit count isn't unit count. A permit issued is not the same as an ADU built. Industry estimates suggest 70-80% of issued ADU permits actually complete construction. The 20-30% that don't usually fall to financing issues mid-project, contractor disputes, or owners discovering unbudgeted site conditions (sewer connections, geotech requirements) after submittal.
Pre-approved permits compress timelines but not costs. PRADU and YOU-ADU plans get fast plan check. They don't get cheap construction. The savings are in plan-check fees ($500-$2,000) and time-to-permit (50-100 days). Construction costs are essentially identical to custom designs of equivalent size and quality.
Implications for your project
If you're considering an ADU now:
- The legal environment is the most permissive it's been. State preemptions continue to expand homeowner rights.
- The financing environment is the tightest it's been in a decade. Run the financing math hard before committing.
- Pre-approved plans (PRADU or YOU-ADU) save 60-100 days of plan check time. If you're not married to a custom design, take the time savings.
- Construction costs are unlikely to drop materially over the next 12-24 months. Don't wait for "cheaper later" unless you have specific intelligence that says otherwise.
The bet on timing: waiting for rates to drop trades 12-24 months of rental income for ~$10K-$20K in interest savings over a 30-year loan. The math usually favors building now if the project pencils at current rates. Don't wait unless the project literally doesn't pencil today.
Run your address through the PermitPathLA wizard for a feasibility-and-cost estimate specific to your lot, factoring in 2026 fees, your overlays, and the realistic 2026 LA construction cost range for projects like yours.
Source citations
All figures above are sourced from publicly available California Department of Housing and Community Development (HCD) Annual Progress Report (APR) data, the LADBS quarterly permit summary reports, and LA City Planning Department data. APR data is published at hcd.ca.gov/planning-and-community-development/annual-progress-reports. LADBS permit data is published at dbs.lacity.gov/services/online-services. Recent legislation cited:
- AB 68 (Ting, 2019). Government Code §65852.2 amendments.
- AB 671 (Friedman, 2019). ADU amnesty program.
- AB 2221 (Quirk-Silva, 2022). Government Code §65852.2 amendments.
- AB 332 (Carrillo, 2023). Government Code §65852.2 ministerial approval timelines.
- AB 1033 (Ting, 2023). Government Code §65852.26 (new section) authorizing condominium ADU sales.
- SB 1211 (Skinner, 2024). Multi-family ADU streamlining.
Numbers above are rounded for readability. Precise figures are available at hcd.ca.gov. This guide is updated annually as new APR data is published.