noun
two-family house; multi-generational home
A single residential building designed to accommodate two separate households, typically parents and their adult child's family, with shared or separate entrances and facilities.
最近、二世帯住宅を建てる若い夫婦が増えている。
Recently, more young couples are building two-family houses.
この二世帯住宅は、玄関が二つあって、プライバシーが守られます。
This two-family house has two entrances, so privacy is maintained.
Compound of 二 (two) + 世帯 (household) + 住宅 (residence). The term became common in the late 20th century as a housing solution for aging parents and their adult children.