mai·son·ette 
(mā′zə-nĕt, -sə-)
(mā′zə-nĕt, -sə-)n.
Chiefly British
Chiefly British
1. A small house.
2. An apartment occupying two or more floors of a larger building and often having its own entrance from outside.
[French maisonnette, diminutive of maison, house, dwelling, from Old French, from Latin mānsiō, mānsiōn-; see MANSION.]