accessory apartment

American  

noun

1. a self-contained living area within a single-family home, as for an aging parent.

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Example Sentences

The owner of the adjoining home, Angella Farserotu, and Thomas Cackett, who rents a ground-level, accessory apartment, have argued in court that they have no legal responsibility for Ippolito-Shepherd’s ailments.

From Washington Post • Jan. 14, 2023

And some homeowners have discovered, neighbors often are at the front of the line to file complaints about perceived problems with aesthetics, parking or overcrowding that an accessory apartment could inflict on their single-family street.

From Washington Post • Jul. 7, 2017