ADU Rules: Hackensack vs Mahwah
How do adu rules rules compare between Hackensack, NJ and Mahwah, NJ?
Hackensack and Mahwah have similar restriction levels.
Hackensack, NJ
Bergen County
Hackensack regulates accessory dwelling units through its zoning code, with permissions varying by district. Most single-family residential zones do not permit standalone ADUs without variance approval from the Zoning Board of Adjustment.
View full Hackensack rules →Mahwah, NJ
Bergen County
Mahwah permits accessory apartments as a conditional accessory use in all residential zones under Chapter 24 (Zoning) of the Township Code. Section 24-4.1(d) authorizes the use, while Section 24-6.1(j) sets the conditions: one accessory apartment per single-family residence, 400 to 800 square feet, no more than 30% of the habitable living space, a maximum of three occupants, and the principal building must be owner-occupied at all times. After July 1, 1997, no new affordable accessory apartments may be created.
View full Mahwah rules →Key Facts Comparison
| Fact | Hackensack | Mahwah |
|---|---|---|
| Zoning approval | Variance typically required | - |
| Permit authority | Building Department | - |
| State law | Municipal Land Use Law | - |
| Inspections | UCC inspections required | - |
| Max fine | Up to $2,000 daily | - |
| Local Authority | - | Mahwah Code Ch. 24 (Zoning) |
| Permitting Section | - | Sec. 24-4.1(d) (conditional accessory use) |
| Standards Section | - | Sec. 24-6.1(j) |
| Where Allowed | - | All residential zones (conditional use) |
| Units Per Lot | - | One accessory apartment per single-family residence |
| Size Range | - | 400 to 800 sq ft, not more than 30% of habitable living space |
| Occupants | - | Maximum three per apartment |
| Owner Occupancy | - | Required at all times |
| State Law | - | N.J.S.A. 40:55D-1 et seq. (MLUL); N.J.A.C. 5:23 (UCC) |
Highlighted rows indicate differences between cities.
Hackensack FAQ
Can I build an ADU in my Hackensack backyard?
Detached ADUs generally require a use variance from the Zoning Board of Adjustment in single-family zones. Two-family zones may allow accessory apartments by right with proper permits.
Do I need a permit to convert my basement into an apartment?
Yes. Basement conversions require building permits, plumbing/electrical permits, zoning approval, and a certificate of occupancy under the New Jersey Uniform Construction Code.
Are short-term rentals of ADUs allowed?
Hackensack restricts short-term rentals through municipal ordinance. Check current registration and licensing rules with the City Clerk before listing any unit.
Mahwah FAQ
Where in Mahwah can I add an accessory apartment?
Accessory apartments are permitted as a conditional accessory use in all residential zones under Section 24-4.1(d) of the Mahwah Zoning Ordinance. Conditional use approval from the Planning Board is required, and the unit must satisfy the standards in Section 24-6.1(j).
Can I rent out the accessory apartment if I don't live in the main house?
No. Section 24-6.1(j) requires that the building be owner-occupied at all times. An accessory apartment cannot lawfully be operated on a property where the owner does not occupy the principal dwelling.
How big can the accessory apartment be?
The minimum floor area is 400 square feet and the maximum is 800 square feet, and in no case may the apartment exceed 30% of the habitable living space of the dwelling, per Section 24-6.1(j).
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