location of the principal building. (i) Except as otherwise provided in section 21-620 ( Temporary Family Health Care Structures ), accessory buildings in residential districts shall be subject to the following: (1) No accessory building shall be used as a dwelling
Read it in the chapter →How this ordinance defines it
The operative definition is the local one. Codes routinely subdivide a category into tiers — “day care 2, family”, “group home 2” — and attach different permissions to each, so only Williamsburg’s own text settles what this covers.