ADU rules in El Cajon, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
El Cajon allows one ADU plus one JADU per single-family lot. Maximum 1,200 sq ft but not larger than the primary dwelling. Setbacks of 5 ft allow 20 ft height, 4 ft allows 16 ft. El Cajon uniquely requires a sewer lateral video.
El Cajon permits ADUs consistent with CA Government Code Section 65852.2. Single-family lots may have one ADU and one JADU. Maximum ADU size is 1,200 sq ft of habitable space but may not exceed primary dwelling size including non-habitable spaces. Height varies by setback: 5-foot allows 20 ft, 4-foot allows 16 ft, 3-foot allows 12 ft. Detached ADUs must be at least 6 feet from the primary dwelling. One parking space per unit required unless within half a mile of transit. El Cajon uniquely requires a sewer lateral video inspection, and CFD fees may apply. City approval or denial within 60 days. ADUs may not be sold separately.
Unpermitted ADU construction is a building code violation. Short-term rental of ADUs prohibited. Separate sale not permitted.
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Side-by-side rule comparisons with other cities in San Diego County.
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