El Cajon stands out for its municipal ADU Loan Program — deferred-repayment loans paired with city Standard Plans for studio, 1BR, and 2BR units in exchange for a 5-year affordability covenant.
ADU zoning standards live in Municipal Code §17.140.180. The city is actively updating these rules through a published Zoning Code Amendment project.
State guarantee: California requires every city to allow at least an 800 sq ft ADU exempt from local lot coverage, FAR, and front-setback rules.
Height baseline: 16 ft for detached, rising to 18 ft within ½ mile of major transit. Attached ADUs follow the primary home, capped at 25 ft.
Parking follows current zoning and state standards; confirm site-specific outcomes with Planning during the active code amendment.
Apply through the Housing Division for the loan track and Planning/Building for the permit. The loan program includes free city-developed standard plans.
State backstop: A complete ADU permit must receive a decision in 60 business days. If the city stalls past 30 business days, AB 253 lets you hire a certified private plan checker to force a 10-business-day decision.
The ADU Loan Program offers deferred-repayment loans to cover construction costs in exchange for a 5-year affordability term.
SB 543: No impact fees on ADUs ≤750 sq ft. Above 750 sq ft, fees scale to the ratio of ADU size vs the main home.
Visit the official El Cajon ADU page (link in hero) for current eligibility and downloads.
Standard ADUs in El Cajon: no owner-occupancy required (made permanent in 2023).
JADUs: limited to 500 sq ft of interior livable space within an existing single-family home. Owner occupancy is required only when sanitation facilities are shared with the main house. JADUs cannot be used as short-term rentals (AB 1154 / SB 543).
Sketch a floorplan, walk through it in 3D, and have our planners review it for size, height, and setback compliance before you submit to El Cajon.
Heads up: Local rules change frequently. This page summarizes publicly available state law (California Government Code §§ 66310–66342) and current local guidance for general planning purposes. Always confirm specifics with the El Cajon planning desk before submitting plans. ADUMetrics does not provide legal advice.