In confirming that a unit in a triplex can qualify as a principal residence, CRA stated:
Where the units in a triplex are separate units, it is generally our view that each of the units is an independent housing unit for purposes of the definition of principal residence in section 54.
A taxpayer who is an undivided co-owner of a triplex could therefore designate the unit in the triplex that was ordinarily inhabited by the taxpayer as the taxpayer’s principal residence if all the conditions of the definition of principal residence in section 54 were otherwise satisfied.