ADU Pass
Lancaster
Los Angeles County portion
Also in: No County
ADU Pass helps homeowners in Lancaster, Los Angeles County, California navigate the permit paperwork for building an accessory dwelling unit. This area covers 3 ZIP codes.
Map
ADU details
ADU legality: allowed
California preempts; Lancaster's process is unusually streamlined — Planning approval is bypassed and ADU applications go directly to Permitting/Building & Safety.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 150 | $4,500 | $51,000 | $55,500 |
| 600 | 600 | $5,500 | $204,000 | $209,500 |
| midpoint | 675 | $5,500 | $229,500 | $235,000 |
| 1000 | 1,000 | $8,000 | $340,000 | $348,000 |
| maximum | 1,200 | $8,500 | $408,000 | $416,500 |
Fee breakdown (as of 2025-10)
Permitting process
- Pre-application zoning self-check (no Planning approval needed)
Confirm parcel is in residential district under Title 17. Lancaster ADU applications skip Planning Division entirely. - Building permit submittal at Permit Center (~3d)
Submit application + plans to Lancaster Permit Center; permits@cityoflancasterca.gov / (661) 723-6144. Online portal available; in-person intake at City Hall. - Plan check (Building & Safety + Public Works + Fire) (~28d)
Concurrent review by Lancaster Building & Safety, Public Works (sewer + grading), and LA County Fire (Lancaster contracts with LA County Fire). - Corrections cycle (~14d)
Address plan check comments; cycle 1-2 typical for compliant submittals. - Permit issuance (~3d)
Pay fees, sign ADU deed-restriction covenant where applicable, receive permit. - Construction inspections
Foundation, framing, MEP rough, insulation, drywall, final by Lancaster Building & Safety + LA County Fire.
Viability (permitted uses)
- Long-term rental: yes (CA Gov Code 65852.2(a)(7))
- Subject to AB 1482 statewide rent cap (5% + CPI, max 10%) — applies to ADUs older than 15 years and to units in multifamily-zoned properties
- Tenant Protection Act just-cause eviction requirements apply
- Short-term rental: with-restrictions (Lancaster Municipal Code Chapter 5 (Business licensing) + Title 17 STR provisions) Lancaster regulates STRs separately from ADU permitting. Operators must obtain a STR business license.
- Office rental: no (Lancaster Title 17 — ADUs defined as residential dwelling units) Renting ADU as commercial office prohibited; ADUs are residential-use only.
- Home office: with-restrictions (Lancaster Title 17 home occupations chapter)
- Home-occupation permit; restrictions on signage, customer traffic, and outside employees
- Studio / workshop: yes Personal artist studio is a permitted accessory residential use; commercial studio rental falls under officeRental.
- Agriculture: with-restrictions Larger Antelope Valley parcels (RA, A zones) may permit ag-related accessory structures including small livestock; standard residential ADUs in R zones are residential only.
- Relative support: yes (CA Gov Code 65852.22 (JADU)) JADU specifically supports multigenerational housing; family occupancy of ADU explicitly permitted.
Incentives
- CalHFA ADU Grant Program — $40,000 one-time predevelopment (when funded) (Moderate-income owner-occupants statewide)
- Prop 13 ADU assessment limit
- Lancaster ADU Assistance Loan Program — Up to $10,000 deferred-payment, no-interest loan from City of Lancaster Housing Department for ADU soft costs (design, permits, plan-check). Forgivable over 5 years if conditions met. City-administered, distinct from any state program.
- Planning approval bypass — Lancaster ADU applications skip Planning Division entirely — direct to Building & Safety. Saves 2-4 weeks vs. coastal LA cities.
- SB 13 impact-fee waiver (under 750 sqft) — Statewide impact-fee waiver for ADUs under 750 sqft.
Contacts
Staff: Permit Services Center (Lancaster ADU permit intake (Planning approval bypassed)) permits@cityoflancasterca.gov, Lancaster Housing Department (ADU Assistance Loan Program administrator)
Utilities
- Water: Los Angeles County Waterworks District 40 (Antelope Valley) · 30d connect · $4,500
Lancaster does NOT have a city-owned water utility. LA County Waterworks District 40 (Antelope Valley) is the primary provider for Lancaster, Palmdale, and unincorporated Antelope Valley. Supply is 70% imported State Water Project surface water + 30% groundwater. JADUs and under-750-sqft ADUs don't require separate water meters under SB 13. - Sewer: LA County Sanitation District 14 (Antelope Valley) · 30d connect · $4,500
Lancaster sanitary sewer is operated by LA County Sanitation District 14, treated at the Lancaster Water Reclamation Plant (advanced tertiary; recycled-water re-use). - Electric: Southern California Edison (SCE) · 60d connect · $2,200 · separate meter required
SCE is the only electric utility serving Lancaster (Lancaster is NOT in LADWP territory despite proximity to LA — LADWP territory ends at the LA City limits). SCE plan check + meter set typically the longest-lead utility step in Lancaster's ADU process. - Gas: Southwest Gas · 21d connect · $1,500
Southwest Gas serves the Antelope Valley (NOT SoCalGas, which serves the LA Basin proper).
Property values & taxes
Lancaster median home value substantially below LA Basin (~50% of Glendale's). Antelope Valley housing supply growth and remote-work commuter market drive demand.
Market rent by ADU size
| Sq ft | Rent |
|---|---|
| 400 | $1,450/mo |
| 600 | $1,750/mo |
| 800 | $2,050/mo |
| 1,000 | $2,300/mo |
| 1,200 | $2,500/mo |
Construction timeline
Realistic total: best 7mo · typical 10mo · worst 16mo
Lancaster's flat lots and abundant undeveloped land speed schedule. Summer heat (110+°F July-August) creates working-condition delays for crews; winter is the preferred build window.
Modular pathway inspectors are experienced with modular
Financing
State ADU loans:
- CalHFA ADU Grant Program (CalHFA) up to $40,000
- Lancaster ADU Assistance Loan (City of Lancaster Housing Department) up to $10,000
Insurance impact
Lower premium delta than coastal LA reflects lower replacement-cost basis. Western foothill parcels in WUI may face FAIR Plan exposure (~$500-700/yr).
HOA prevalence & preemption
Lancaster has more master-planned HOA neighborhoods than coastal LA suburbs (Quartz Hill, Westside neighborhoods, planned communities along Avenue J/K). AB 3182 preempts ADU bans; HOAs retain reasonable design-standards authority.
Regulatory overlays (5)
- wui-fire-zone — Lancaster's western foothills near the San Andreas Fault and Quail Lake-area parcels (CAL FIRE Moderate-High zones); central flatland Lancaster is largely outside WUI. · +14d · +6% cost
WUI exposure is high-desert vegetation type, not LA-foothill type. Chapter 7A applies to designated parcels. (map) - airport-noise-zone — Northeastern Lancaster parcels under the Edwards Air Force Base (KEDW) AICUZ — accident potential / noise contour zones · +14d · +4% cost
Edwards AFB R-2515 restricted airspace covers ~1,812 sq mi over the Antelope Valley. Northern Lancaster parcels within the 65 dB CNEL contour require acoustic treatment of habitable rooms. Southern Lancaster also affected by Palmdale Regional Airport (USAF Plant 42) AICUZ. (map) - seismic-retrofit-zone — All Lancaster parcels — within 10 km of San Andreas Fault (Mojave segment) and Garlock Fault zones · +4% cost
Seismic Design Category D2; high site-specific peak ground acceleration values. Standard SDC-D2 design for new ADUs. (map) - flood-zone — Limited — Amargosa Creek, Anaverde Creek, and ephemeral arroyos in southwestern Lancaster · +14d · +3% cost
Most Lancaster parcels are outside FEMA flood zones; high desert with limited surface water. (map) - other — Antelope Valley Air Quality Management District (AVAQMD) — small construction projects exempt from major source rules but PM10/PM2.5 dust-control plan required for grading >1 acre · +1% cost
AVAQMD jurisdiction (separate from SCAQMD which governs LA Basin). Most ADU projects are exempt; 1-acre+ grading triggers Rule 403 dust mitigation. Located at 2551 W Avenue H, Lancaster CA 93536. (map)
Technical envelope (climate & building code)
Climate & energy code
Lancaster has a true high-desert climate: large diurnal swing (50°F+ summer day-to-night), strong daytime winds (Mojave wind corridor), and 110+°F summer peaks. ZERO frost-depth tolerance is wrong; a 12 inch design frost depth is appropriate for elevation 2,300 ft.
Building code
Amendments:
- Amendment
- Amendment
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: Lancaster Municipal Code Title 17 (Zoning), Chapter 17.05 — Accessory dwelling unit and junior accessory dwelling unit regulations, adopted 2021-08-10, last amended 2024-01-01
- 2017-01-01 — CA AB 2299 / SB 1069 — first wave statewide ADU preemption (state-law)
First-wave statewide ADU preemption requiring cities to permit ADUs by right.
Effect: Required Lancaster to amend Title 17 zoning to remove discretionary review of ADUs. - 2020-01-01 — AB 68 / AB 881 / SB 13 / AB 670 — 2020 ADU package (state-law)
Coordinated 2020 ADU bill package: 60-day ministerial deadline, fee caps, HOA preemption.
Effect: Forced Lancaster Municipal Code Chapter 17.05 amendments to add ministerial track and SB 13 fee waivers for ADUs under 750 sqft. - 2021-08-10 — Lancaster ADU ordinance amendment — Title 17 conforming changes (city-ordinance)
City Council amendment to Title 17 Chapter 17.05 ADU provisions to align with state 2020 package.
Effect: Codified ministerial track, removed discretionary ADU review, set Lancaster development standards within state envelope. - 2023-01-01 — SB 897 / AB 2221 — height and separation standardization (state-law)
2023 cleanup bills standardizing detached-ADU height (up to 16 ft single-story) and confirming prefab eligibility.
Effect: Lancaster updated implementation guides; height standards still tracked Title 17 Chapter 17.05 with state-floor overrides where conflict. - 2024-01-01 — AB 976 — permanent owner-occupancy elimination (state-law)
Made the temporary AB 68 owner-occupancy ban permanent.
Effect: Lancaster's owner-builder requirement at application intake (residence at time of application) survives because it is not an ongoing owner-occupancy condition. - 2024-06-01 — Lancaster ADU Assistance Loan Program launched (city-program)
City Housing Department deferred-payment soft-cost loan program for homeowners building ADUs.
Effect: Up to $10,000 deferred no-interest loan, no monthly payments, forgivable over 5 years if conditions met. Targets soft costs (design, plan check, permits) for low/moderate-income owners. - 2025-10-01 — Lancaster Building & Safety + Citywide Fee Schedule update (city-fee-schedule)
Annual fee schedule update effective October 1, 2025.
Effect: Updated permit and plan-check fee amounts; ADU fees substantially lower than Glendale or LA City due to Antelope Valley cost-of-living index.
Known issues (1)
- other (since 2024-01) — Southern California Edison meter installation and service connection lead time runs 45-90 days for ADU service drops in the Antelope Valley; longer than the Lancaster city plan-check cycle. Plan SCE engagement at submittal. (source)
Los Angeles County — county ADU rules and overlays
County ADU ordinance
Los Angeles County regulates ADUs on unincorporated parcels under Title 22 (Planning and Zoning) of the County Code. The ordinance layers on top of California Government Code sections 65852.2 (ADU) and 65852.22 (JADU) and conforms to AB 68 / AB 881 / SB 13 (2019), AB 345 / AB 976 (2019 owner-occupancy elimination), AB 2221 / SB 897 (2022 permit-timeline tightening), and AB 1033 (2023 optional condo-ADU separation). Per ongoing state ADU reform — including AB 976 (2023 permanent elimination of owner-occupancy requirements), AB 1033 (2023 condo-ADU), AB 2533 (2024 strengthened amnesty / unpermitted-ADU legalization), SB 543 (2024 fee transparency), and AB 1332 (2023 statewide pre-approved plans) — any local provision conflicting with state law is null and void. The county's distinct contributions atop state law are its Hillside Management Area (HMA) design standards, Very High Fire Hazard Severity Zone (VHFHSZ) / WUI requirements for extensive back-country parcels, Coastal Development Permit (CDP) requirements in the certified portions of the county's Local Coastal Program (Santa Monica Mountains, Marina del Rey, and unincorporated coastal fringe), historic-district protections in designated Historic Preservation Overlay Zones and National Register districts, and airport-noise compatibility review around Whiteman, Compton/Woodley, Fox Field, General Fox, and the military influence areas.
- Los Angeles County Code Title 22 (Planning and Zoning), Section 22.140.640 — Accessory Dwelling Units
- Los Angeles County Code Title 22 Section 22.140.645 — Junior Accessory Dwelling Units
- Ordinance No. 2020-0019 — Initial comprehensive ADU ordinance conforming to 2019 state reform package
- Ordinance No. 2023-0041 — ADU Ordinance Update
- County Planning ADU program webpage and technical bulletins
State-floor overlay: California state law (Gov. Code 65852.2, 65852.22) preempts most local ADU regulation. The state sets ministerial-approval requirements; caps owner-occupancy restrictions (permanently eliminated by AB 976, effective 2024); mandates 60-day permit review timelines (AB 2221 / SB 897); sets minimum allowed sizes (state-floor 850 sqft one-bedroom, 1000 sqft two-bedroom for detached ADUs); forbids parking requirements within 1/2 mile of transit or for ADUs created via garage conversion; caps impact fees at zero for ADUs under 750 sqft (SB 13); requires utility connection handling (AB 2221 / SB 897 prohibit separate sewer/water capacity fees for ADUs under certain thresholds); and preempts local design-review triggers beyond objective design standards. AB 2533 (2024) requires jurisdictions to administratively legalize pre-2020 unpermitted ADUs that meet current state standards. AB 1033 (2023) permits — but does not mandate — cities and counties to opt into an optional program allowing ADUs to be sold as condominium units separately from the primary dwelling. Los Angeles County's ordinance reiterates and applies these state floors, adding only the locally-controlled hillside, fire, coastal, historic, and airport-noise overlays. Where a project is in a VHFHSZ, the Santa Monica Mountains Local Coastal Program jurisdiction, or a Historic Preservation Overlay Zone, state ADU preemption still applies to the ADU allowance itself but does not preempt the county's separate fire, coastal, or historic-preservation authority over site-design standards.
County regulatory overlays
Los Angeles County administers or co-administers an unusually wide set of overlay regimes that materially affect ADU siting on unincorporated parcels, reflecting its combined coastal, mountain, desert, and urban geography: (1) California Coastal Commission jurisdiction in the unincorporated coastal zone, implemented through the county's certified Local Coastal Programs for the Santa Monica Mountains (Malibu/Topanga area) and Marina del Rey; (2) Very High Fire Hazard Severity Zones (VHFHSZ) designated by CAL FIRE / State Board of Forestry across the Angeles, San Gabriel, and Santa Monica Mountains and the Antelope Valley foothills, driving California Building Code Chapter 7A (WUI) ignition-resistant-construction and Pub. Res. Code 4291 defensible-space requirements; (3) Hillside Management Areas (HMA) defined under Title 22 on parcels with slope 25% or steeper — a county-unique overlay that adds objective hillside design standards on top of state ADU allowance; (4) FEMA Special Flood Hazard Areas along the Los Angeles, San Gabriel, Rio Hondo, Santa Clara, and Antelope Valley washes, administered by DPW through the county Floodplain Management program; (5) Historic Preservation Overlay Zones and National Register districts — most concentrated in Altadena, Florence-Firestone, East Los Angeles, and specific unincorporated historic enclaves — where design review applies; (6) Airport Land Use Compatibility Plans administered by the Los Angeles County Airport Land Use Commission for Whiteman (Pacoima), Compton/Woodley, Fox Field (Lancaster), General Fox, Brackett Field (La Verne), San Gabriel Valley, Catalina (Avalon), plus military AIAs around Los Alamitos JFTB, Point Mugu, and the Edwards AFB southern extensions; (7) the Santa Monica Mountains North Area Community Standards District and other Community Standards Districts (CSDs) that add area-specific objective standards on top of the base zone.
- California Coastal Commission / Santa Monica Mountains and Marina del Rey Local Coastal Programs — State law (Gov. Code 65852.2(j)) preserves the CDP requirement for ADUs in the Coastal Zone notwithstanding otherwise-ministerial ADU preemption. The ADU itself is still allowed by right; the site-specific CDP review addresses visual, habitat, and public-access impacts separately. The Santa Monica Mountains LCP imposes the most distinctive overlay-specific restrictions on ADU siting in LA County — including ridgeline-avoidance setbacks, ESHA buffer requirements, and fuel-modification-zone coordination with LACoFD.
- CAL FIRE / LACoFD Very High Fire Hazard Severity Zones and Hillside Management Area Fire Requirements — The 2025 wildfire season reinforced fire-hardening requirements across the county. LACoFD may impose additional project-specific conditions in post-fire rebuild areas (Eaton Fire / Palisades Fire rebuild zones). Note: the 2024 'Fire Hazard Severity Zone' statewide update (effective 2025) expanded LRA VHFHSZ boundaries in many LA County unincorporated communities; owners should verify current designated status via the OSFM / CAL FIRE web map. The WUI Chapter 7A premium commonly adds 8-15% to ADU construction cost in unincorporated VHFHSZ communities.
- Hillside Management Area (HMA) — Title 22 objective design standards for sloped parcels — The HMA overlay is largely unique to LA County among California counties of comparable size and often governs the buildable-envelope question before the ADU allowance question. Owners should retain a civil engineer early to verify buildable envelope within HMA constraints; an ADU is still allowed as of right under state law but may be limited to the existing dwelling footprint (conversion) where hillside-envelope constraints preclude a detached addition.
- FEMA Special Flood Hazard Areas — National Flood Insurance Program — Mandatory flood insurance applies to ADUs in SFHA with federally-backed mortgages. Owners should verify effective FIRM panel status before design. Post-2025 wildfire burn scars in the Santa Monica and San Gabriel mountains have elevated debris-flow risk and may result in emergency or post-event FIRM revisions.
- County Historic Preservation — HPOZ-equivalent protection and National Register districts — ADUs within the footprint of a designated historic structure (attached, conversion, JADU) trigger historic-review for building-envelope modifications. Detached ADUs on historic parcels are generally less restricted as long as they are visually subordinate and set back from the historic structure. National Register listing by itself does not impose private-property regulatory limits; it becomes enforceable only when federal funding or permits are involved — but local HPOZ-equivalent designation does impose objective design review.
- LA County Airport Land Use Commission — ALUCP review — In a safety-zone inconsistency, the Board of Supervisors may override only by super-majority vote per PUC 21676. Most single detached ADUs outside the innermost safety zones face only noise-attenuation requirements; ADUs in Safety Zone 1 (runway protection zone) may be prohibited, and those in Safety Zones 2-3 may face density limits that preclude new dwelling units.
- Community Standards Districts (CSDs) — area-specific objective design overlays — CSD standards must remain objective under state ADU preemption. Any CSD provision that would turn a ministerial ADU into a discretionary project or impose non-objective design review is null and void as to ADUs. Applicants and reviewers should cross-reference base zone, CSD, HMA, HPOZ, CDP, and ALUC layers for any given parcel via GIS Net before design.
County permitting (unincorporated parcels)
The Los Angeles County Department of Regional Planning (DRP) is the lead planning / zoning authority for ADU applications on unincorporated parcels, working in tandem with the Department of Public Works — Building and Safety Division (DPW B&S) for building-code plan check and inspection, the Los Angeles County Fire Department (LACoFD — which also serves most contract cities) for fire-defensible-space and WUI review, and the county's Department of Public Health (DPH Environmental Health) where on-site septic or well-water systems are involved. Unincorporated Los Angeles County is vast and diverse: it covers approximately 2,650 square miles and includes dense urbanized fringe areas (East Los Angeles, Florence-Firestone, Willowbrook, West Rancho Dominguez, West Whittier-Los Nietos, Hacienda Heights, Rowland Heights, Altadena, La Crescenta-Montrose, Ladera Heights, View Park-Windsor Hills, Marina del Rey), suburban communities (Walnut Park, Topanga, Agua Dulce, Acton), and extensive rural back-country (Antelope Valley unincorporated — Leona Valley, Littlerock, Llano, Lake Hughes, Green Valley; Angeles and San Gabriel National Forest fringe; Santa Monica Mountains; Santa Clarita Valley unincorporated fringe). ADU permit review therefore traverses materially different zoning, fire-hazard, and overlay regimes depending on where the parcel sits.
California state — ADU law and programs
State ADU law
California has the most aggressive statewide ADU preemption regime in the US, built from ~15 bills passed 2019-2025 and enforced by the Department of Housing and Community Development (HCD). The 2026 HCD ADU Handbook addendum (in effect with the 2025 Title 24 code cycle) is the operative state-level reference. The regime does four things at once: (1) preempts local zoning that would ban or unreasonably restrict ADUs; (2) imposes by-right ministerial approval with short statutory deadlines; (3) caps fees and utility-connection charges; and (4) empowers HCD to void non-compliant local ordinances.
State HOA preemption
California has the strongest statewide HOA-preemption regime in the US for accessory dwelling units, built from two bills: AB 670 (2019) voided ADU-prohibiting covenants on single-family residential lots, and AB 3182 (2020) extended and codified the preemption into the Davis-Stirling Common Interest Development Act (Civil Code §§ 4740 / 4741). The combination prohibits common-interest communities from banning ADUs, restricting rentals below 25% of separate interests, or treating ADUs as separate HOA interests. Limits remain: HOAs retain authority over reasonable design standards and statutory height limits, and the 2026 Carlsbad case (CalMatters coverage) established that an HOA's documented design-standards regime can effectively delay or constrain ADU approval short of outright prohibition.
State financing programs
California's flagship state-level ADU financing program — the CalHFA ADU Grant Program — is paused and has not been refunded since the original $100 million allocation was fully deployed 2023-12-28. The program provided up to $40,000 per qualifying homeowner for pre-construction and non-recurring closing costs and financed approximately 2,500 ADUs in two rounds. As of 2026-04, no new funding round has been announced in the state budget. CalHFA continues to publish anti-scam warnings because bad actors actively solicit homeowners claiming access to grant funds that no longer exist. State-level financing activity has shifted to local pilot programs (San Francisco, San Jose, Los Angeles, San Diego) and private financing products (Fannie Mae ADU mortgage, HELOC, construction-to-permanent).
State housing programs
California's state-level ADU programs are concentrated at HCD (technical guidance, ordinance review, enforcement) and the paused CalHFA grant pipeline (covered under stateFinancing). The state does not operate a central pre-approved ADU plan library — instead, AB 1332 (2024) created a preemption framework for local pre-approved plans with a 30-day ministerial-approval deadline, and major cities (Los Angeles, San Diego, San Jose, Sacramento, Berkeley) have rolled out their own plan catalogs. The California YIMBY coalition and other housing-policy organizations play an influential role in bill drafting; they are not state agencies but effectively drive much of the ADU legislative agenda. The Title 24 code cycle (now 2025, in effect for 2026 permits) is the authoritative building-code baseline.
Federal (United States) — ADU-relevant rules and programs
Federal ADU law
The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.
Federal financing programs
Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.
Federal tax credits
There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.
Federal housing programs
HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.
ZIP Codes
- 93534
- 93535
- 93536
Post Office
- 1008 W Avenue J2, 93534
Locale Names
- Lancaster Carrier Annex