Formal or legal term for a dwelling or residential building, often used in contexts such as searches, inspections, or property rights.
The police cannot enter a residence without a warrant.
A house search was conducted.
A burglar broke into the residence.
The police searched the suspect's residence.
自宅 means one's own home and is used in everyday speech, whereas 家宅 is an impersonal, formal term not tied to any particular owner.
住宅 is the common word for housing or a residence used in real estate and daily life, while 家宅 is a stiff legal term for the same kind of premises.
邸宅 refers to a large, grand mansion, while 家宅 refers neutrally to any residence regardless of size, especially in legal wording.
家宅 is counted with 軒, the standard counter for buildings and houses, as in 一軒の家宅.
Compound of 家 (house) and 宅 (residence), both meaning dwelling; the combination reinforces the formal sense of a residential building.