ADU Rules: Mahwah vs Paramus
How do adu rules rules compare between Mahwah, NJ and Paramus, NJ?
Mahwah and Paramus have similar restriction levels.
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 →Paramus, NJ
Bergen County
Paramus does not authorize stand-alone accessory dwelling units in its residential zones. Chapter 429 (Zoning) of the Borough Code, governing the R-50, R-75, R-100, R-150 and R-2F residential districts, allows accessory buildings only as uses subordinate and customarily incidental to a permitted principal use, and expressly prohibits living quarters in any accessory building. State authority is the New Jersey Municipal Land Use Law (MLUL), N.J.S.A. 40:55D-1 et seq.
View full Paramus rules →Key Facts Comparison
| Fact | Mahwah | Paramus |
|---|---|---|
| Local Authority | Mahwah Code Ch. 24 (Zoning) | Paramus Code Ch. 429 (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) | - |
| State Enabling Law | - | N.J.S.A. 40:55D-1 et seq. (MLUL) |
| Living Quarters in Accessory Buildings | - | Prohibited |
| Accessory Building Coverage | - | Max 60% of main building's land coverage |
| Two-Family Use | - | Allowed only in R-2F zone |
| Path to a Second Unit | - | Use variance under N.J.S.A. 40:55D-70(d) |
Highlighted rows indicate differences between cities.
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).
Paramus FAQ
Can I build a backyard ADU or guest cottage in Paramus?
No. Chapter 429 of the Paramus Code prohibits living quarters in any accessory building in residential zones, and there is no separate ADU use category. Adding a second dwelling on a single-family lot generally requires a use variance from the Zoning Board of Adjustment under N.J.S.A. 40:55D-70(d).
Is converting a garage into an apartment allowed?
Not under the current zoning. A converted garage used as a dwelling unit would be living quarters in an accessory building, which is expressly prohibited in Paramus residential zones. Such conversions also violate the Uniform Construction Code without proper permits and use approval.
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