Biometric technology is expanding to every corner of the home, using body identifiers to open the door, say hello, unlock the wine cellar and reveal the screening room.

Chris Pollack hates carrying keys. So during the yearlong gut remodel and expansion of the Greenwich, Conn., home he bought for $1.825 million in 2012, Mr. Pollack built a new entryway with a biometric access system: a wall-mounted Suprema BioLite fingerprint reader with a glowing scanner that cost about $2,500 to install.

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