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Novi's zoning ordinance has no accessory dwelling unit provision. A search of the full ordinance text (amended through June 6, 2025) finds no section permitting a second dwelling unit, guest house, or apartment accessory to a one-family home. The closest reference is the accessory use definition, which lists residential accommodations for servants or caretakers as a possible accessory use (Section 2.2), and the general exception that not more than one dwelling unit may occupy a lot except in conformance with the lot area per unit rules of the district (Section 3.35.4).
That combination gives no by-right path to build or convert an ADU on a one-family lot. If an accessory residence matters to your plans, confirm how the city treats caretaker accommodations with the Community Development Department at 248-347-0415 before designing anything.