Bolthole Index

Los Angeles County, California

Zoning, building permits and septic rules in Commerce, California

The City of Commerce, California adopts and enforces its own zoning under Title 191, and its Building and Safety Division handles building permits2. Septic and well questions are not answered by the city's own pages we found; ask LA County Environmental Health3. For land outside city limits, use the Los Angeles County page.

At a glance

Zoning
City zoning under Title 19, including R-1, R-2 and R-3 residential zones14
Building permits
Issued by the city's Building and Safety Division2
R-1 minimum lot area
4,000 square feet5
R-1 minimum dwelling size
950 square feet6
R-1 height and coverage
25 feet tall, 45% lot coverage78
RV living on streets
Prohibited where the city has posted notice9
Septic
Not confirmed inside city limits; ask LA County Environmental Health3

Who to call

Building permits

City of Commerce Building and Safety Division (Community Development Department)

Plan review, building permits and building inspections inside Commerce city limits; City Hall also fields zoning and planning questions

(323) 722-4805

permittechnician@commerceca.gov

2535 Commerce Way, Commerce, CA 90040

Septic permits

LA County Department of Public Health, Environmental Health – Onsite Wastewater Treatment Program

County review of septic system plans, soil evaluations and inspections; call to confirm whether a Commerce address falls under it

(626) 430-5380

5050 Commerce Drive, Baldwin Park, CA 91706

Contact details are copied from each office’s official page and were checked against it on October 16, 2026.

Off-grid gear

Going off-grid in Commerce means bringing your own water and power. The kit we’d start with:

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Does Commerce, CA have zoning, and what does it mean for lot size and setbacks?

Yes. The City of Commerce adopts and administers its own Title 19 zoning regulations, including the R-1, R-2 and R-3 residential zones1. Zoning rules vary by district, so check the zone before you plan anything. In the R-1 low-density zone, the minimum lot area is 4,000 square feet5 and a dwelling must be at least 950 square feet6. R-1 buildings may be up to 25 feet tall7 and cover up to 45% of the lot8. A front-yard driveway in any residential zone may be no wider than 20 feet, or 30 feet where it leads directly to three covered side-by-side parking spaces10. Los Angeles County's Title 22 zoning applies only to unincorporated land, not inside Commerce11.

Do you need a building permit in Commerce, CA, and who issues it?

Commerce's Building and Safety Division reviews construction plans, performs building inspections and issues building permits inside the city2. We could not confirm from the city's code which projects are exempt or whether an owner-builder exemption applies, so ask the division before you start. Plans submitted from January 1, 2026 are checked against the 2025 California Building, Electrical, Green, Mechanical, Plumbing and Residential Codes2. Reach the division through City Hall at (323) 722-48052. The Los Angeles County Public Works permit offices serve unincorporated land, so a reader inside Commerce should not start there12.

How do septic permits work inside Commerce, CA?

We could not confirm which agency permits septic systems inside Commerce city limits, or whether a new septic system is allowed there at all. LA County Environmental Health runs the septic program for unincorporated land13, and its Onsite Wastewater Treatment Program reviews plans, soil evaluations and inspections3. Call that office at (626) 430-5380 to confirm whether a Commerce address falls under it3. County rules also bar a septic permit when a public sewer is within 200 feet of the building14, which matters in a developed city. Private wells fall under a county well-permit program that covers Los Angeles County except Long Beach, Pasadena and Vernon15.

Can you live in an RV or tiny home in Commerce, CA?

Not on the street. Commerce prohibits parking or standing any vehicle, including mobile homes and recreational vehicles, used for dwelling purposes on streets, alleys and public ways where the city has posted signs or markings9. Temporary RV parking permits exist for short-term use, but the code states they do not allow dwelling in the vehicle16. We could not confirm the rule for living in an RV or tiny home on private property inside Commerce; ask City Hall at (323) 722-4805 before you buy2.

Building a home in Commerce, CA: the steps, in order

  1. Confirm the zoning district and its lot size, height and coverage limits with the city4.
  2. Check the floodplain: construction in a mapped special flood hazard area must follow the city's Chapter 6.18 floodplain regulations17.
  3. Ask the Building and Safety Division which permits and plan checks your project needs2.
  4. Confirm sewer or septic with LA County Environmental Health3.
  5. If a driveway meets a state highway, a Caltrans encroachment permit is required18.
  6. Schedule inspections through the division2.

What to check before you buy land in Commerce, CA

Confirm the zoning district and the floodplain status first417. Figures from the county data apply to all of Los Angeles County, not Commerce alone: the effective property tax rate is 0.7%19 and the typical home value is about $888,42620. Septic is the unresolved item, so get a written answer from LA County Environmental Health3.

Watch-outs

  • Los Angeles County's building, zoning and septic rules for unincorporated land do not automatically apply inside Commerce city limits11.
  • We could not confirm the city's owner-builder rules, permit fees or septic authority; call the Building and Safety Division at (323) 722-48052.
  • Overnight dwelling in a vehicle on a Commerce street is prohibited where signs or markings give notice9.

Sources

  1. 19.07.030 - Development standards (Commerce), quoted and re-checked
  2. City of Commerce Building and Safety Division (Community Development Department) (commerceca.gov)
  3. LA County Department of Public Health, Environmental Health – Onsite Wastewater Treatment Program (admin.publichealth.lacounty.gov)
  4. 19.07.030 - Development standards (Commerce), quoted and re-checked
  5. library.municode.com (Commerce), quoted and re-checked
  6. 19.07.030 - Development standards (Commerce), quoted and re-checked
  7. library.municode.com (Commerce), quoted and re-checked
  8. library.municode.com (Commerce), quoted and re-checked
  9. 10.44.130 - Restriction of oversized vehicle parking (Commerce), quoted and re-checked
  10. 19.07.080 - Driveway restrictions (Commerce), quoted and re-checked
  11. Los Angeles County Code Title 22: Planning and Zoning, quoted and re-checked
  12. Building and Safety - LA County Public Works Permits, quoted and re-checked
  13. Local Agency Management Program (LAMP), quoted and re-checked
  14. New Ordinance Adopted - Local Agency Management Program, quoted and re-checked
  15. State Small Water Systems and Wells, quoted and re-checked
  16. 10.44.140 - Unlawful parking of vehicles, including vehicles parked, stopped or standing on public right-of-ways that are used for dwelling purposes (Commerce), quoted and re-checked
  17. 19.19.210 - Floodplain management regulations (Commerce), quoted and re-checked
  18. Encroachment Permits | Caltrans (California statewide rule), quoted and re-checked
  19. Effective property tax rate: Bolthole Index county data
  20. Typical home value (Zillow): Bolthole Index county data

Written October 16, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Commerce

Commerce’s own rules

  • Local zoningPresent

    Land inside Commerce city limits; the city adopts and administers Title 19 zoning regulations, including R-1, R-2, and R-3 residential zones.

    “Table 19.07.030A identifies the development standards applicable to all development in the R-1, R-2, and R-3 zones.”
  • Zoning districtsPublished

    Commerce city residential zoning districts, including R-1, R-2, and R-3.

    “Table 19.07.030A identifies the development standards applicable to all development in the R-1, R-2, and R-3 zones.”
  • Minimum dwelling sizeSpecified

    R-1 low-density residential zone inside Commerce city limits.

    • The table applies to development in the R-1 zone and includes the stated density and other development standards.

    minimum dwelling unit size: 950 square feet

    “3. Minimum Dwelling Unit Size 950 sf 850 sf 1-bdrm: 700 sf 2-bdrm: 850 sf 3-bdrm: 1,000 sf 4+-bdrm: 1,150 sf”
  • Minimum lot sizeSpecified

    R-1 low-density residential zone inside Commerce city limits.

    minimum lot area: 4000 square feet

    “2. Minimum Lot Area 4,000 sf 5,000 sf/duplex unit 3,000 sf/unit for 2 single-family units 2,000 sf/unit and not less than 7,500 sf”
  • Lot coverageSpecified

    R-1 low-density residential zone inside Commerce city limits.

    • The coverage must also be within the allowable floor area.

    maximum lot coverage: 45 percent of total lot area (including all structures, porches, and patios; must also be within allowable floor area)

    “16. Maximum Lot Coverage (including all structures, porches, and patios) 45% of the total area of the lot. (must also be within the allowable floor area)”
  • Building heightSpecified

    R-1 low-density residential zone inside Commerce city limits.

    • The maximum is both twenty-five feet and a two-story maximum.

    maximum building height: 25 feet (two-story maximum)

    “4. Maximum Building Height 25 ft., two-story maximum”
  • Living in an RVProhibited

    Recreational-vehicle parking or occupancy on streets, alleys, public ways, and public places inside Commerce city limits.

    • The restriction applies in areas where the city has caused signs or markings giving adequate notice.
    • Exceptions include qualifying commercial, governmental, emergency, bus, disabled-placard, and permitted recreational vehicles.
    • Temporary or disability recreational-vehicle permits may authorize specified parking, but the cited code does not authorize dwelling in a vehicle.
    “Except as otherwise provided by statute, ordinance, resolution, permit, regulation, policy or other authorization by the city, no person shall park, stop, stand, or cause, allow or permit to park, stop, or stand, any vehicle, including mobile homes and recreational vehicles, used for dwelling purposes, in the streets, highways, alleys, public ways, public places, areas, or portions thereof.”
  • Camping on your landProhibited

    Temporary camping or dwelling in recreational vehicles and other vehicles on public streets, alleys, highways, public ways, and public places inside Commerce city limits.

    • The prohibition is subject to exceptions created by statute, ordinance, resolution, permit, regulation, policy, or other city authorization.
    • The code separately provides temporary recreational-vehicle parking permits for loading, unloading, short-term use, and visitor parking, but states that nothing in that section permits dwelling in a vehicle.
    “Except as otherwise provided by statute, ordinance, resolution, permit, regulation, policy or other authorization by the city, no person shall park, stop, stand, or cause, allow or permit to park, stop, or stand, any vehicle, including mobile homes and recreational vehicles, used for dwelling purposes, in the streets, highways, alleys, public ways, public places, areas, or portions thereof.”
  • Driveway accessLimited

    Driveways in front yards of residential zones inside Commerce city limits.

    • A driveway leading directly to three covered side-by-side parking spaces may be up to thirty feet wide.
    • The rule applies to any residential zone.

    maximum driveway width: 20 feet (30 feet where access leads directly to three covered side-by-side parking spaces)

    “a driveway in a front yard in any residential zone shall be no more than twenty feet in width. in the case where a driveway or other access leads directly to three covered side-by-side parking spaces, the driveway width shall not exceed thirty feet.”
  • Building in a floodplainRequired

    New construction, reconstruction, rehabilitation, additions, alterations, manufactured homes, developments, subdivisions, and manufactured-home parks inside Commerce areas of special flood hazard.

    • The development must be governed by Title 6, Chapter 6.18 floodplain-management regulations.
    • Those regulations include anchoring, flood-resistant materials and utilities, minimizing flood damage, drainage, utility-system protections, and locating on-site waste-disposal systems to avoid impairment or contamination.
    “All new construction, reconstruction, rehabilitation, addition or other proposed new development of a structure, renovation or alteration of existing uses or structures, including manufactured homes, developments, subdivisions or manufactured home parks, determined to be within an area of special flood hazard shall be governed by the floodplain management regulations set forth in Title 6, Chapter 6.18, of this code.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Commerce or Los Angeles County directly.

  • Building permit — General building-permit requirements for construction inside Commerce city limits beyond the cited accessory-dwelling provisions.
  • Owner-builder exemption — Owner-builder exemptions from contractor or permit requirements inside Commerce city limits.
  • Building code adopted — Building-code adoption applicable inside Commerce city limits.
  • Inspections — Building inspections inside Commerce city limits.
  • Certificate of occupancy — Certificates of occupancy for buildings inside Commerce city limits.
12 more unanswered
  • Tiny homes
  • Manufactured homes
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Subdividing land
  • Short-term rentals
  • Permit fees
  • Permit process

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Commerce publishes no rule on the point, not that none exists. Los Angeles County’s page lists the county offices to call.

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