City · New Jersey
ADU rules in Maplewood
These are the primary sources for accessory dwelling unit regulations in Maplewood: the city's own zoning code, planning department pages, and permit guides. Start here before talking to anyone: the rules below are what your permit reviewer will apply.
Rules at a glance
An ADU may be an entirely self-contained portion of the principal one-family dwelling or be located in an accessory building (including a garage) on the same lot; one ADU is a permitted use in any residence or in any garage or accessory structure on lots in the R-1-4, R-1-5, R-1-7 or R-2-4 Zones if the Zoning Officer finds the listed conditions met.
§ 271-89; § 271-90.AThe ADU definition covers a group of rooms constituting an entirely self-contained portion of a principal one-family dwelling, with no cooking, food preparation, or sanitary facilities in common with the rest of the building. An attached ADU must use the same exterior materials and colors as the principal dwelling, and an ADU may not be situated in a cellar.
§ 271-89; § 271-90.A(5), (12)Size floor and ceiling plus a bedroom cap; floor area is defined as gross horizontal areas measured from outside walls, excluding garage areas, existing accessory structures, and cellar floor areas.
§ 271-90.A(4), (10); § 271-89Either the ADU or the primary dwelling unit must be the domicile of the person(s) who own the property lot, and the owner must be a natural person, not an entity. The owner must file a sworn affidavit by January 1 each year confirming continued compliance and residence; failure to file automatically revokes the ADU certificate of occupancy within 20 days and carries a $500 fine.
§ 271-90.A(2); § 271-89; § 271-93Article IX (§§ 271-88 through 271-98) imposes no off-street parking condition for ADU approval. The article does require compliance with all existing Township ordinances and zoning ordinances generally, so baseline residential parking standards elsewhere in Chapter 271 are not displaced, but nothing ADU-specific was found.
§ 271-90.AADUs are expressly 'allowed in the R-1-4, R-1-5, R-1-7, and R-2-4 Zones as a permitted use' and § 271-90 repeats 'permitted use' subject to conditions verified administratively by the Zoning Officer (zoning review application, decision within 10 business days of a required applicant meeting; denials appealable to the Zoning Board of Adjustment within 45 days). Confusingly, the § 271-91 heading calls the application one for 'designation of proposed accessory dwelling unit as conditional use', but the process is administrative Zoning Officer review, not a board conditional-use hearing.
§ 271-88; § 271-90.A; § 271-91; § 271-92.BOccupancy and use limits are approval conditions; an annual owner affidavit polices continued compliance and any noncompliant creation, maintenance, or occupancy is punishable by a $500-per-day fine. The NJ Law Against Discrimination is expressly made applicable to all ADUs. Chapter 209 (Rental Properties: rent control, annual rental registration and licensing, lead-paint inspections) exists in the Township code, but its section text was not read for this extraction and Article IX does not cross-reference it.
§ 271-90.A(2), (3), (9); § 271-93; § 271-95.C; § 271-97; § 271-98The fine print: 8 caveats that can change the picture
- ADUs are allowed only in the R-1-4, R-1-5, R-1-7, and R-2-4 Zones; the underlying residence must be an existing detached one-family dwelling, and only one ADU is allowed per lot (§ 271-88, § 271-90.A(1), (8))
- Properties designated historic by the Historic Preservation Commission cannot have an ADU unless they meet all requirements and receive a certificate of appropriateness (§ 271-88)
- The § 271-91 heading labels the approval a 'conditional use' designation even though §§ 271-88 and 271-90 call ADUs a permitted use; approval is administrative by the Zoning Officer, so the flat 'permitted' value hides that terminology conflict
- ADUs may not be located in a cellar, may not have balconies or decks, and may not have a separate street-facing external entrance on the same street as another entrance to a building on the lot (§ 271-90.A(5), (11), (13))
- Construction must commence within 120 days of approval and be completed within 180 days of permit issuance, with extensions only for cause (§ 271-92)
- An annual affidavit of continued compliance is due by January 1 each year; missing it automatically revokes the ADU certificate of occupancy and triggers a $500 fine, with $500-per-day fines for continued occupancy (§ 271-93)
- On transfer of the property, the new owner must apply within 60 days for a certificate of continued use ($100 fee), sellers must disclose the approved ADU to prospective buyers, and the ADU cannot be sold separately (§ 271-95)
- A fully handicapped-accessible ADU under the NJ Barrier Free Subcode earns a 5% total maximum floor area bonus applicable to either unit or both (§ 271-90.A(10))
Summarized from Maplewood's ordinance text, read July 2026; every row links the code section it came from. Rules often vary by zone and lot, so treat this as orientation, not a permit determination, and confirm with the planning department before you commit to a design.
ADU regulations
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