Accessory Dwelling Unit (ADU)

  1. General Information
  2. Requirements
  3. Application Materials

An Accessory Dwelling Unit (ADU) may be approved in all base zoning districts as an accessory use to a principal single-family dwelling unit if all  conditions listed in Sec. 54-214 of the City of Charleston Zoning Ordinance are met.


An ADU is defines as, "a dwelling unit providing complete, independent living facilities for no more than two (2) adults that is separate from and subordinate to the principal dwelling unit, and located in the same building as the principal dwelling unit or in an accessory building on the same lot. This definition includes garage apartments."


Either the principal structure or the ADU must be owner-occupied.  If the ADU is to be rented for compensation, monetary or otherwise, the ADU must meet Affordable Housing income and rental thresholds as defined in Sec. 54-120 of the City of Charleston Zoning Ordinance. 


Neither the principal dwelling unit nor ADU shall be utilized for Short Term Rental.


The property shall not be converted into Horizontal Property Ownership Regime.