ADUs and lot splits
Fontana posts AB 1332 pre-approved detached ADU plans of 462, 738 and 1,143 square feet, one to three bedrooms, already checked against local zoning and building codes but still needing site details and a permit.
For investors: A Fontana investor adding a 738-square-foot two-bedroom behind a rental can skip much of the custom design spend. Confirm the lot's setbacks fit the plan footprint first, because the pre-approval covers the building, not your parcel.
Source: City of Fontana Building and Safety, Standard ADU Plans, Oct 2026
Fontana Sec. 30-467 bars renting any ADU or junior ADU for under 30 days, however old the unit, and lets an ADU be rented but not sold apart from the main house.
For investors: Underwrite a Fontana ADU as a monthly rental only; a guest-stay plan would break the code even on an older unit. Because it cannot be split off and sold, its value arrives as rent supporting the combined property's DSCR.
Source: Fontana Zoning and Development Code Sec. 30-467, Oct 2026
Fontana Sec. 30-434.1 makes owners of a two-unit project live in one unit unless the lot came from an urban lot split, and bars renting any unit for under 30 days.
For investors: Fontana's two-unit path suits owner-occupants, not absentee investors: only individuals or trusts may apply, not LLCs, and the owner must live on site unless the lot came from an urban lot split. A pure rental hold fits the ADU route better.
Source: Fontana Zoning and Development Code Sec. 30-434.1 (Two-unit projects), Oct 2026