Same zip, different jurisdiction: this page covers LA County Public Works (DPW). The same zip code(s) also cover parts of La Mirada (La Mirada (its own permits)). Verify your parcel's jurisdiction before filing, different agencies, different rules.
Gateway Cities · LA County (Unincorporated)
ADU permits in East La Mirada
Zip codes:90638
East La Mirada is a small unincorporated community of about 4,500 people in the Gateway Cities region of LA County, immediately east of the City of La Mirada. It is not a city. Building permits run through Los Angeles County Public Works (Building & Safety), not La Mirada city's department.
Unincorporated LA County, not LADBS
East La Mirada is unincorporated territory. Building permits go through LA County Public Works (Building & Safety) ↗ under LA County Code Title 22, not the Los Angeles Department of Building and Safety (LADBS). Our address checker pulls real feasibility data for any LA County address; the East La Mirada-specific permit pathway is detailed below.
East La Mirada by the numbers
Rounded figures from the 2020 US Census, LA County Assessor parcel data, and LA County DPW permit records.
Population
4,500
2020 Census
Single-family homes
~1,200
LA County Assessor
Median lot size
6,000 sqft
Approximate
ADU permits filed 2025
~16
Source: HCD 2025 total (1,278) distributed proportionally across 2024 per-area shares. 2024: 18.
What makes East La Mirada different
East La Mirada is functionally distinct from La Mirada city. Permits run through LA County DPW Building & Safety via EPIC-LA.
LA County ADU rules for East La Mirada
Last verified: 2026-04-15
Current LA County rules from Title 22 of the County Code, as applied to East La Mirada. State preemption (Gov Code §§ 66310-66342) means the county can't reduce below the state baseline. We note where that applies.
| Max detached ADU size | 1,200 sqft (state default) |
| Max ADU height | 16 ft / 18 ft with second-story setbacks |
| Setbacks | 4 ft side / 4 ft rear (state minimum) |
| Permitting agency | LA County Public Works (Building & Safety) |
| Local processing time | 60 days from complete submittal (state-mandated) |
Active overlays + extra rules in East La Mirada
LA County overlays + state-level designations that hit a meaningful share of East La Mirada parcels.
Watch-outs specific to East La Mirada
- 01
Don't file with La Mirada, it's LA County
East La Mirada residents frequently default to La Mirada city for permits, then have to restart with LA County.
Amenities + civic services in East La Mirada
Parks, libraries, and the school district that serve the area. Context that matters for renter appeal, family relocation, and long-term resale.
Public schools
School assignments vary by exact address. Performance levels below are from the official California School Dashboard, California's official accountability system uses colored levels (blue highest, red lowest) rather than 1-10 numeric scores.
District
Norwalk-La Mirada Unified School District
Getting around East La Mirada
Bus-served suburban.
Transit + walkability
Bus lines
- Norwalk Transit
Walkability
Moderately walkable.
Nearby airports
Distance + type for each major Los Angeles-area airport reachable from East La Mirada. Useful for travel, commute, and any flight-path noise concerns on specific parcels.
Fullerton Municipal (FUL)
~4 miGeneral aviation
Long Beach Daugherty Field (LGB)
~12 miRegional / domestic
Nearby areas to East La Mirada
Other Los Angeles-area pages worth a look. Each one runs different Accessory Dwelling Unit (ADU) rules depending on jurisdiction, we show you what changes when you cross a city or county line.
LA County unincorporated
South Whittier →
Largest unincorporated community in LA County by population. LA County (not Whittier city) jurisdiction shapes the Accessory Dwelling Unit (ADU) permitting path.
LA County unincorporated
West Whittier-Los Nietos →
Mid-size Gateway Cities unincorporated community. LA County jurisdiction + mid-tier home values shape the Accessory Dwelling Unit (ADU) economics.
Frequently asked questions about East La Mirada ADUs
›Can I build an ADU in East La Mirada?
Yes. East La Mirada allows ADUs under LA County Code Title 22, aligned with California Gov Code §§ 66310-66342. Most single-family lots can host one ADU plus one JADU. Permits go through LA County Public Works (Building & Safety), not LADBS, since East La Mirada is unincorporated territory rather than a city.
›Why does East La Mirada use LA County rules instead of LA City rules?
East La Mirada is unincorporated. It's never been formally incorporated as its own city, so LA County serves as the local government. Building permits, zoning, sheriff, libraries (in many cases), and most other services run through county departments rather than city ones.
›Where do I submit my East La Mirada ADU permit?
Online via LA County's EPIC-LA portal, or in-person at the LA County Public Works Building & Safety counter in Alhambra (900 S. Fremont Avenue). The EPIC-LA online portal handles most ADU submittals end-to-end, so you rarely need to visit in person.
›How long does the ADU permit process take in East La Mirada?
LA County DPW targets the state-required 60-day plan check for ADUs from a complete submittal. Hillside, VHFHSZ, or environmental-review parcels can extend timelines by 4 to 12 weeks. East La Mirada-specific overlays may add additional time. See the watch-outs above.
›Are LA County's pre-approved ADU plans free?
Yes. LA County maintains three pre-approved standard ADU plans (Plans A, B, and C) usable in any unincorporated area, including East La Mirada. They're free to use, similar to LADBS's YOU-ADU program. The trade-off is reduced design flexibility, but for a fast, low-cost permit path they're the strongest option.
Ready to see what your East La Mirada lot can do?
Our free address checker pulls real zoning, overlay, and parcel data for any Los Angeles County address, including unincorporated East La Mirada. Start there and we'll surface what applies to your specific lot.
Check your address →Reviewed by Yair Harpaz, Founder, PermitPathLA. California DRE-licensed broker with 30+ years of Los Angeles real estate and mortgage industry experience.
East La Mirada ordinance data last reviewed .
See an error or stale rule? corrections@permitpath.la
Primary sources: LA County DPW ADU info · LA County Code Title 22