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storage areas or similar uses, or an accessory structure or detached from the proposed or existing primary dwelling and located on the same lot as the proposed or existing primary dwelling, including detached garages. (iv) If there is an existing primary dwelling, the total ﬂoor area of an attached accessory dwelling unit shall not exceed 50 percent of the existing primary dwelling. (v) The total ﬂoor area for a detached accessory dwelling unit shall not exceed 1,200 square feet. (vi) No passageway shall be required in conjunction with the construction of an accessory dwelling unit. (vii) No setback shall be required for an existing living area or accessory structure or a structure constructed in the same location and to the same dimensions as an existing structure that is converted to an accessory dwelling unit or to a portion of an accessory dwelling unit, and a setback of no more than four feet from the side and rear lot lines shall be required for an accessory dwelling unit that is not converted from an existing structure or a new structure constructed in the same location and to the same dimensions as an existing structure. (viii) Local building code requirements that apply to detached dwellings, except that the construction of an accessory dwelling unit shall not constitute a Group R occupancy change under the local building code, as described in Section 310 of the California Building Code (Title 24 of the California Code of Regulations), unless the building ofﬁcial or enforcement agency of the local agency makes a written ﬁnding based on substantial evidence in the record that the construction of the accessory dwelling unit could have a speciﬁc, adverse impact on public health and safety. Nothing in this clause shall be interpreted to prevent a local agency from changing the occupancy code of a space that was unhabitable space or was only permitted for nonresidential use and was subsequently converted for residential use pursuant to this section. (ix) Approval by the local health ofﬁcer where a private sewage disposal system is being used, if required. (x) (I) Parking requirements for accessory dwelling units shall not exceed one parking space per accessory dwelling unit or per bedroom, whichever is less. These spaces may be provided as tandem parking on a driveway. (II) Offstreet parking shall be permitted in setback areas in locations determined by the local agency or through tandem parking, unless speciﬁc ﬁndings are made that parking in setback areas or tandem parking is not feasible based upon speciﬁc site or regional topographical or ﬁre and life safety conditions. (III) This clause shall not apply to an accessory dwelling unit that is described in subdivision (d). (xi) When a garage, carport, or covered parking structure is demolished in conjunction with the construction of an accessory dwelling unit or converted to an accessory dwelling unit, the local agency shall not require that those offstreet parking spaces be replaced. 90 Ch. 752—3 —