1House; home — a kanji rarely standing alone, but very common as a suffix (attached to a name, e.g. 佐藤様宅) or in compounds like 自宅 (one's own home), 宅配 (home delivery), 帰宅 (returning home).
仕事の後、私は自宅に帰った。
After work, I returned home.
宅配便が荷物を届けてくれた。
The courier delivered the package.
帰宅途中にスーパーに寄った。
I stopped by the supermarket on my way home.
佐藤様宅へ荷物をお届けに上がりました。
I've come to deliver a package to Mr. Sato's residence.
2One's house or home (often used with the honorific お as お宅, to refer to someone's home, or, colloquially, as a polite 'you').
お宅はどちらですか？
Where is your home?
お宅のご夫妻によろしくお伝えください。
Please give my regards to you and your spouse.
3A somewhat old-fashioned, formal term a wife uses to refer to her own husband; uncommon today, but still occasionally heard in polite phone or business contexts.
宅はただいま出張中でございます。
My husband is away on a business trip right now.