Trenton, NJ Accessory Structures: ADU Owner Occupancy (2026)
Key Facts
- Owner-occupancy required
- Yes, one unit
- Governing section
- § 315-9.4.B(2)
- Applies to
- Primary dwelling or the ADU
- Checked at
- Building/zoning permit stage
- Max fine for noncompliance
- $2,000 per day
Summary
Trenton requires that whenever a property has an accessory dwelling unit, the owner must live in one of the two units on-site. City Code § 315-9.4.B(2) states that 'one of the dwelling units must be occupied by the owner of the property,' closing off ADUs as a pure rental-only investment separate from an owner-occupant.
1. An ADU may be located only on a lot with one single-family dwelling. 2. One of the dwelling units must be occupied by the owner of the property. 3. A lot must have a minimum area of 4,000 square feet to qualify for an ADU. 4. Only one ADU is permitted per lot.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4853025; v21 updated 2025-12-16; through 12-16-2025).
Full Breakdown
B pair every size and setback rule with a residency condition: item 2 requires that one of the dwelling units must be occupied by the owner of the property. That means a lot cannot legally carry an ADU if both the primary house and the accessory unit are rented out to non-owner tenants; the property owner, not merely a long-term lessee, must reside in either the principal dwelling or the ADU itself. The requirement sits alongside the other qualifying conditions in the same subsection: the lot must carry only one single-family dwelling, be at least 4,000 square feet, and hold no more than one ADU.
12, where the applicant's ownership and intended occupancy of the property are part of the record reviewed before the unit can be built or converted. B(2), and the ADU use is no longer conforming until an owner again occupies one of the two dwelling units.
Violations & Fines
An ADU maintained without owner-occupancy violates § 315-9.4.B(2) and is treated as a zoning violation subject to the citywide general penalty in § 1-17: a fine up to $2,000, up to 90 days in the county jail, or up to 90 days of community service. Section 1-18 makes each day the property remains out of compliance a separate offense, and repeat violations within a year draw an added fine under § 1-19.
Frequently Asked Questions
Can I rent out both my house and my ADU in Trenton?
Does the owner have to live in the main house or can they live in the ADU instead?
What happens if I stop living on a property that has an ADU?
Sources & Official References
Other rules in Trenton
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