Building permits, zoning and septic rules in Montebello, California

At a glance

Building permits

Issued by the City of Montebello Building & Safety Division¹

Zoning

City zoning code, run by the Planning Division²

Minimum house size (R-1)

1,200 sq ft of floor area⁴

R-1 and R-A limits

40% lot coverage, 35 ft height⁵⁶

Septic

Not confirmed inside city limits; ask Building & Safety and county Environmental Health⁷

RV living

No residential RV rule confirmed; camping in public parks needs parks director permission⁸

Accessory dwelling units

Allowed in R-1 and R-A on lots with one existing house⁹

Who to call

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

Does Montebello have zoning, and what does it mean for lot size, setbacks and manufactured homes?

Yes. The City of Montebello Planning Division is responsible for implementing the city's general plan and zoning code². Los Angeles County's Title 22 zoning applies to the unincorporated area, not automatically to cities such as Montebello³.

Dimensional rules depend on the district. In the R-1 Single-Family Residential zone, every one-family dwelling needs at least 1,200 square feet of floor area and must be at least 20 feet wide⁴. New lots in R-A and R-1 need 5,000 square feet south of Beverly Boulevard and 6,000 square feet north of it¹⁰. Residential zones require a 20-foot front setback and 5 feet on the side for habitable buildings¹¹. R-A and R-1 lots allow 40% lot coverage including accessory structures and patio covers⁵ and buildings up to 35 feet tall⁶.

A manufactured home in the R-1 zone must be certified under the National Mobile Home Construction and Safety Standards Act of 1974, sit on a permanent foundation, and meet the same development standards as other one-family dwellings¹².

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

Montebello's Building & Safety Division issues building, electrical, plumbing, mechanical and grading permits inside city limits¹. The division asks you to contact it before starting any project to find out whether city approvals, permits and inspections are required¹. Do not send a Montebello address to the Los Angeles County Public Works counter: the county issues permits for properties in unincorporated Los Angeles County, and another office may handle a property outside that jurisdiction¹³.

The city has adopted the 2019 California Residential Code with later amendments¹⁴, and the 2025 California Building Standards Code applies to permit applications filed on or after January 1, 2026¹⁵. Building permit fee amounts are set by city council resolution, not in the municipal code¹⁶.

The permit counter is open Monday through Thursday and closed Friday¹. California's owner-builder exemption from contractor licensing exists, but owner-builders remain responsible for obtaining building permits and passing inspections¹⁷. We could not confirm Montebello's own owner-builder procedure, so ask Building & Safety.

Can you build an accessory dwelling unit in Montebello?

Montebello's code permits second dwelling units as a matter of right in the R-1 and R-A zones when the lot has one existing single-family dwelling⁹. The city's text caps a detached unit at 1,200 square feet and bars units on substandard lots⁹. That ordinance text predates recent state ADU amendments, so state law may override some limits⁹. California requires ADU applications to be approved ministerially, without discretionary review or a hearing, and the permitting agency must tell you within 15 business days whether the application is complete¹⁸. Confirm current standards with the Planning Division².

How do septic permits work inside Montebello?

We could not confirm who permits septic systems inside Montebello city limits; the city's code sections we reviewed do not say. Los Angeles County's Department of Public Health reviews and approves onsite wastewater treatment systems under its Local Agency Management Program for residents of unincorporated areas and contracted cities⁷, and in the unincorporated area an application and plan approval are required before any work begins¹⁹. Whether a Montebello address falls under that program is not confirmed, so call Building & Safety¹ and then the county Onsite Wastewater Treatment Program²⁰.

California lets local agencies run septic programs consistent with the state's onsite wastewater policy²¹. Los Angeles County-wide, only 6.6% of soils rate as not limited for a conventional drain field²², so expect a site evaluation if septic is ever proposed. Wells are also unconfirmed inside the city; local enforcing agencies administer well permits in California²³.

Can you live in an RV or tiny home in Montebello?

We could not confirm a Montebello rule on living in an RV or tiny home on private residential land; ask the Planning Division². The rules we did confirm are narrow. Camping in a public park inside the city requires permission of the director of parks and recreation, and that rule does not cover private land⁸. In flood zones, RVs must be on site fewer than 180 days and road-ready, or meet permit and elevation requirements²⁴.

State law gives the baseline: RVs are not intended as permanent dwellings, and unless a local ordinance allows otherwise they generally may be occupied only in mobilehome parks or special occupancy parks²⁵. A tiny home on a chassis with axles and 400 square feet or less of floor area is treated as an RV, while one on a foundation must meet the California Building Standards Code or factory-built housing standards²⁶.

Building a home in Montebello: the steps, in order

1. Call the Planning Division at (323) 887-1478 to confirm your parcel's zone and its lot, setback, coverage and height limits².
2. Confirm the zone allows your use, such as a one-family dwelling or an accessory dwelling unit⁹.
3. Contact Building & Safety at (323) 887-1497 before starting, to learn which permits and inspections apply¹.
4. Submit plans for plan checking and pay the permit fee set by city council resolution¹⁶.
5. Ask Building & Safety and the county Onsite Wastewater Treatment Program who handles wastewater for your address²⁰.
6. Request inspections as work proceeds; inspections are done only during city hours, Monday through Thursday¹.

What stays with Los Angeles County, and what to check before you buy in Montebello

For land outside Montebello's city limits, see the Los Angeles County page; the county's unincorporated-area rules do not govern lots inside the city³.

Before buying inside the city, check whether the lot sits in a special flood hazard area: new construction and substantial improvements there must be anchored against flotation, collapse and lateral movement, and manufactured homes must be elevated on a permanent foundation to or above base flood elevation²⁴. Los Angeles County's effective property tax rate is 0.7%²⁷, and its typical home value is $888,426²⁸.

Watch-outs

• Search results for Montebello permits often show Los Angeles County Public Works, but the county issues building permits for unincorporated land only¹³.
• Montebello's permit counter and inspections run Monday through Thursday only, so plan around the Friday closure¹.
• We could not confirm septic authority, wells, certificate of occupancy or a residential RV rule inside Montebello; call Building & Safety¹ and the Planning Division² before relying on any of them.
• The city's ADU ordinance text predates recent state ADU amendments, so state ADU law may override its limits⁹.

Sources

1. City of Montebello Building & Safety Division (montebelloca.gov)
2. City of Montebello Planning Division (montebelloca.gov)
3. Los Angeles County Code Title 22: Planning and Zoning, quoted and re-checked
4. Montebello Code 17.14.030 R-1 development standards (Montebello), quoted and re-checked
5. Montebello Code 17.10.020 Residential development standards (Montebello), quoted and re-checked
6. Montebello Code 17.10.020 Residential development standards (Montebello), quoted and re-checked
7. Local Agency Management Program (LAMP), quoted and re-checked
8. Montebello Code 12.24.120 Overnight camping (Montebello), quoted and re-checked
9. Montebello Code 17.10.280 Accessory dwelling units (Montebello), quoted and re-checked
10. Montebello Code 17.10.020 Residential development standards (Montebello), quoted and re-checked
11. Montebello Code 17.10.040 Setback requirements (Montebello), quoted and re-checked
12. Montebello Code 17.14.030 R-1 development standards (Montebello), quoted and re-checked
13. Building and Safety - LA County Public Works Permits, quoted and re-checked
14. Montebello Code 15.68.010 California Residential Code adoption (Montebello), quoted and re-checked
15. Approved Building Standards (California statewide rule), quoted and re-checked
16. Montebello Code 15.04.030 Building permit fees (Montebello), quoted and re-checked
17. Building Officials - Owner-Builder Overview, quoted and re-checked
18. Accessory Dwelling Unit Handbook March 2026 (California statewide rule), quoted and re-checked
19. admin.publichealth.lacounty.gov, quoted and re-checked
20. LA County Department of Public Health, Environmental Health – Onsite Wastewater Treatment Program (admin.publichealth.lacounty.gov)
21. Water Quality Control Policy for Siting, Design, Operation and Maintenance of Onsite Wastewater Treatment Systems (OWTS Policy) (California statewide rule), quoted and re-checked
22. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
23. Well Standards (California statewide rule), quoted and re-checked
24. Montebello Code 15.40.190 Flood anchoring (Montebello), quoted and re-checked
25. hcd.ca.gov (California statewide rule), quoted and re-checked
26. Information Bulletin 2016-01 (MH, FBH, SHL, MP/SOP, RT, OL) — Revised: Tiny Homes, quoted and re-checked
27. Effective property tax rate: Bolthole Index county data
28. 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.