sa propre maison

one's own house

→ son
phrase Rare #37,364
one's own house Used to emphasize that the house belongs to the person or is personally theirs. The possessive adjective changes with the owner (sa, sa, son, etc.); here the fixed phrase is illustrated with sa propre maison.
FR: Chacun est roi dans sa propre maison.
EN: Everyone is king in their own house.

Tom a construit sa propre maison.

Tom built his own house.

Il est difficile d'avoir sa propre maison à Tokyo.

It’s difficult to own your own home in Tokyo.

Mon frère aîné a construit sa propre maison le mois dernier.

My older brother built his own house last month.

Des fois elle se comporte comme si c'était sa propre maison.

Sometimes she acts as if it were her own house.

— Parasite (2019)

Chacun est roi dans sa propre maison.

Everyone is king in their own house.

La charité commence par sa propre maison.

Charity begins at home.