South Bay · LA County
ADU permits in Commerce
Zip codes:90040
Commerce is a small independent city of about 13,000 people in southeast Los Angeles County, between East LA and Montebello. It runs its own building and planning departments. The city has a substantial industrial + commercial base — Commerce hosts the Commerce Casino (the largest card-room casino in California) + the Citadel Outlets (one of the largest outlet shopping centers in Los Angeles County) alongside its smaller residential neighborhoods.
Independent city — not LADBS
Commerce runs its own building department. Permits go through Commerce Community Development Department ↗, not the Los Angeles Department of Building and Safety (LADBS). Our address checker pulls real zoning + overlay data for any Los Angeles County address. The Commerce ordinance breakdown below covers the city-specific permit path.
Commerce by the numbers
Rounded figures from the 2020 US Census, LA County Assessor parcel data, and the city's own published reports. Estimates only — your specific lot can vary widely.
Population
13,000
2020 Census
Single-family homes
~3,200
LA County Assessor
Median lot size
5,400 sqft
Approximate
Median home value
$0.7M
Zillow / Redfin
What makes Commerce different
Commerce's ADU ordinance is in Commerce Municipal Code Title 19. The city aligns with the California state baseline. Plan check is typically 45-60 days.
Commerce ADU ordinance — the rules that apply
Last verified: 2026-05-12
The current ADU rules in Commerce, sourced from the city's published ordinance and verified against CA Government Code §65852.2 (which preempts local rules stricter than state baselines). When you see "state default," that means the city can't reduce below this number under state law.
| 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) |
| Local processing time | 45-60 days for standard ADUs |
| Pre-approved standard plans | None city-specific |
Active overlays + extra rules in Commerce
City overlays + state-level designations that hit a meaningful share of Commerce parcels. Each affects what you can build, how long it takes, or how much it costs.
Industrial-corridor adjacency
~25% of parcelsParcels near active industrial operations face air-quality + setback review.
Watch-outs specific to Commerce
Patterns we see across CommerceADU permits. None are dealbreakers — they're just the things people get wrong most often.
- 01
Montebello Unified school fees apply
Montebello Unified School District (MUSD) covers Commerce. Facility fees apply on ADUs over 500 sqft.
Need a person, not a wizard?
Routes that fit Commerce
Based on what we know about Commerce, these are the lead types that usually make sense here. Pick whichever fits your situation. All free, no obligation.
Complex permit context
Request a Commerce permit referral
Coastal, hillside, historic, fire-zone, or multi-overlay parcels in Commerce usually mean a permit expediter pays for itself in saved months. We work with vetted Los Angeles permit expediters and expeditors (both spellings) who've handled Commerce projects.
Complex permit context
Request a Commerce permit referral
Coastal, hillside, historic, fire-zone, or multi-overlay parcels in Commerce usually mean a permit expediter pays for itself in saved months. We work with vetted Los Angeles permit expediters and expeditors (both spellings) who've handled Commerce projects.
Plans that fit Commerce lots
Commercedoesn't maintain a city-specific pre-approved plan library the way the Los Angeles Department of Building and Safety (LADBS) does. California Department of Housing and Community Development (HCD)-approved prefab (which bypasses local plan check) and custom designer plans are the main paths:
Amenities + civic services in Commerce
Parks, libraries, and the school district that serve the area. Context that matters for renter appeal, family relocation, and long-term resale.
Parks + sports
Bristow Park
Sheila Street, central Commerce
Main community park with sports facilities.
- Baseball
- Playground
- Community Center
- Picnic
Rosewood Park
Atlantic Boulevard, west Commerce
Mid-size park with recreation programs.
- Baseball
- Playground
- Picnic
Libraries
Commerce Library
LA County Library
Slauson Avenue, central
Public schools
School assignments vary by exact address. The district + notable schools below cover most of the area.
District
Montebello Unified School District (MUSD)
Notable schools in the area
- Bell Gardens High School (MUSD)
Getting around Commerce
Bus-served. Mostly car-dependent.
Transit + walkability
Bus lines
- Metro 60
- Metro 254
- Commerce Bus Routes
Walkability
Citadel Outlets + casino areas are walkable. Residential mostly car-dependent.
Nearby airports
Distance + type for each major Los Angeles-area airport reachable from Commerce. Useful for travel, commute, and any flight-path noise concerns on specific parcels.
Long Beach Daugherty Field (LGB)
~14 miRegional / domestic
Los Angeles International (LAX)
~16 miInternational
Community + landmarks in Commerce
Annual events, landmarks, and the places that anchor the area's identity. Context for renter appeal and long-term resale.
What makes Commerce Commerce
Casino
Commerce Casino
Largest card-room casino in California by table count. Major regional employer.
Outlet mall
Citadel Outlets
Major regional outlet shopping center built around the historic Assyrian-style Citadel building (originally a Uniroyal tire factory).
Nearby areas to Commerce
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.
Independent city
Montebello →
Mid-tier home values, Whittier Narrows Recreation Area adjacency, and SGV / SELA bridge location drive steady Accessory Dwelling Unit (ADU) demand.
LA County unincorporated
East Los Angeles →
Affordable lot prices, strong long-term rental demand, and Metro E + L Line transit access make East LA a steady Accessory Dwelling Unit (ADU) market with significant Chicano cultural identity and rich community history.
Frequently asked questions about Commerce ADUs
›Can I build an ADU in Commerce?
Yes. Commerce allows ADUs under its local ordinance, aligned with California Government Code §65852.2 (the state baseline that preempts overly-strict local rules). Most single-family lots can host one ADU plus one JADU. Permits go through Commerce Community Development Department, not LADBS — see the ordinance table above for the specific rules.
›How does Commerce differ from LA City for ADU permits?
Three main differences: the permit agency (Commerce Community Development Department vs. LADBS), the local ordinance details (each city has some flexibility above the state baseline), and the timeline (some cities are faster, some slower than LA's 60-day plan check). See the ordinance breakdown above for the specifics on each.
›How much does it cost to build an ADU in Commerce?
Median home value in Commerce is around $0.7M, which usually means lot economics support a quality ADU build of $200K–$400K all-in. Hillside, coastal, or VHFHSZ lots add 7–25% on top. HCD-prefab units (Connect Homes, Cover, Plant Prefab) bypass local plan check entirely and typically run $190K–$350K turnkey.
›Does Commerce have pre-approved standard plans like LA's YOU-ADU?
No. Unlike LADBS, Commerce does not maintain a city-specific pre-approved plan library. The two faster paths are an HCD-approved prefab (factory-certified, skips local plan check) or a custom designer drawing for your lot. The slower path is a fully custom architect-led design.
›Will the PermitPathLA wizard work for my Commerce address?
Yes. The wizard pulls real zoning, overlay, and parcel data for any Los Angeles County address, including Commerce. What you'll see today: feasibility for your specific lot, the overlays that apply, and a routing summary pointing at Commerce Community Development Department for the permit submittal. Deeper Commerce-specific permit walkthroughs are next on the roadmap as we expand from LADBS into the independent-city ordinances.
Ready to see what your Commerce lot can do?
Our free address checker pulls real zoning, overlay, and parcel data for any Los Angeles County address — including Commerce. Start there and we'll surface what applies to your specific lot.
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