noun
one house; one building
Used as a counter for houses or buildings, often in contexts like addresses, real estate, or describing a single dwelling.
この通りには一軒のパン屋がある。
There is one bakery on this street.
彼は郊外に一軒家を買った。
He bought a detached house in the suburbs.
一戸 is also a counter for houses, but is more formal and often used in official documents or statistics, while 一軒 is more common in everyday speech.
Compound of 一 (one) and 軒 (counter for houses/buildings). The reading いっけん results from the regular sound change of いち + けん.