Zoning, building permits and septic rules in La Mirada, California

La Mirada’s own rules

• Local zoningPresent

  Land inside La Mirada city limits; the city's own zoning ordinance (Title 21 Zoning) governs residential districts.

  • Title 21 Zoning is part of the city's adopted code current through Ord. 743 (passed 7-8-2025) per the American Legal Publishing overview page.

  “table 21.18.030 sets forth the minimum development standards for residential development in each zoning district.”

• Zoning districtsPublished

  Residential zoning districts inside La Mirada city, including single-family residential R-1 (R-1-6,000 through R-1-15,000), R-3 and R-4.

  • Non-residential district chapters were not opened in this research pass.

  “single-family residential (r-1) r-3 r-4 -6,000 -7,500 -8,000 -10,000 -15,000”

• Minimum lot sizeDistrict specific (with conditions)

  Single-family residential R-1 districts inside La Mirada city (R-1-6,000, R-1-7,500, R-1-8,000, R-1-10,000 and R-1-15,000, the number being the minimum lot size). The multi-family R-3 and R-4 columns are not part of this claim.

  • Table 21.18.030 lists average lot size in addition to minimum; the average figures for R-1 are 7,500 sf, 9,000 sf, 10,000 sf, 15,000 sf and 20,000 sf in column order.
  • Table values are the minimum development standards used for project review under Table 21.18.030.
  • Overview page states the code is current through Ord. 743 (passed 7-8-2025); effective date of the table not stated.

  minimum lot size R-1-6,000: >= 6000 sf · minimum lot size R-1-7,500: >= 7500 sf · minimum lot size R-1-8,000: >= 8000 sf · minimum lot size R-1-10,000: >= 10000 sf · minimum lot size R-1-15,000: >= 15000 sf · minimum lot width R-1-6,000: >= 60 ft · minimum lot width R-1-7,500 and R-1-8,000: >= 75 ft · minimum lot width R-1-10,000: >= 90 ft · minimum lot width R-1-15,000: >= 100 ft

  “lot size: - minimum 6,000 sf 7,500 sf 8,000 sf 10,000 sf 15,000 sf 6,000 sf 10,000 sf - average 7,500 sf 9,000 sf 10,000 sf 15,000 sf 20,000 sf n/a n/a lot width - minimum 60 ft. 75 ft. 75 ft. 90 ft. 100 ft. 60 ft. 60 ft.”

• SetbacksDistrict specific (with conditions)

  Single-family residential R-1 districts inside La Mirada city (R-1-6,000 through R-1-15,000). Setbacks apply to the first floor only per table note 1.

  • Table note 1: in the r-1 zoning districts, the setback standards apply to the first floor only. see section 2.18.030(b) regarding second story setback requirements.
  • Rear yard and interior side setbacks listed in the table are minimums per Table 21.18.030 (rear yard 15 ft in all R-1 subdistricts).

  front yard minimum R-1 (all subdistricts): >= 20 ft · interior side yard minimum R-1-6,000 through R-1-8,000: >= 5 ft · interior side yard minimum R-1-10,000 and R-1-15,000: >= 10 ft · street side yard minimum R-1-6,000 through R-1-8,000: >= 10 ft · street side yard minimum R-1-10,000 and R-1-15,000: >= 15 ft · rear yard minimum R-1 (all subdistricts): >= 15 ft

  “street side yard 10 ft. 10 ft. 10 ft. 15 ft. 15 ft. 10 ft. 10 ft. rear yard (2) 15 ft. 15 ft. 15 ft. 15 ft. 15 ft. 15 ft. 20 ft.”

• Lot coverageSpecified

  Single-family residential R-1 districts inside La Mirada city (R-1-6,000 through R-1-15,000).

  • Table 21.18.030 maximum lot coverage for the R-1 columns is 40%.

  maximum lot coverage R-1 (all subdistricts): <= 40 percent

  “lot coverage - maximum 40% 40% 40% 40% 40% 50% 50%”

• Building heightSpecified

  Single-family residential R-1 districts inside La Mirada city (R-1-6,000 through R-1-15,000).

  • Main structure maximum height 35 ft; accessory structure maximum 15 ft per Table 21.18.030.
  • Table note 3 applies to R-3/R-4 only and is not part of this claim.

  maximum height main structure R-1 (all subdistricts): <= 35 ft · maximum height accessory structure R-1 (all subdistricts): <= 15 ft

  “height limit - maximum: main structure 35 ft. 35 ft. 35 ft. 35 ft. 35 ft. 50 ft. (3) 50 ft. (3) accessory structure 15 ft. 15 ft. 15 ft. 15 ft. 15 ft. 15 ft. 15 ft.”

• Accessory dwellingsAllowed

  Accessory dwelling units (ADU) and junior ADUs (JADU) on single-family residential R-1 lots inside La Mirada city.

  • ADU approved ministerially through site plan review under chapter 21.114; no public hearing or public notice required.
  • Maximum size of a new built ADU: 800 square feet for one bedroom or less; 1,200 square feet for more than one bedroom. Maximum size of a JADU: 500 square feet, including any addition built for the JADU.
  • Parking and other standards apply under the same section; not reviewed in full.

  maximum new built ADU size, one bedroom or less: <= 800 sf · maximum new built ADU size, more than one bedroom: <= 1200 sf · maximum JADU size: <= 500 sf

  “an adu or jadu shall be considered and approved ministerially subject to a site plan review pursuant to chapter 21.114. no public hearing or public notice shall be required.”

Still unanswered

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

• Owner-builder exemption — Owner-builder permit availability for a homeowner building on their own land inside La Mirada city.
• Building code adopted — Adoption of the California Building Standards Code and any local building code in La Mirada city.
• Inspections — Building inspections for construction inside La Mirada city.
• Certificate of occupancy — Certificate of occupancy for new homes inside La Mirada city.
• Minimum dwelling size — Minimum dwelling size for a home inside La Mirada city.

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.

Off-grid gear

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

• Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
• Power Bluetti Solar generators and home battery backup for living off the grid.
• Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
• Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.

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