Do I need to replace my whole deadbolt to install a smart lock?

Most of the picks here, including the Schlage Encode and the Ultraloq Bolt SE and U-Bolt Pro, are full deadbolt replacements that install with a screwdriver on standard US doors (1-3/8 in to 1-3/4 in thickness, 2-3/8 in or 2-3/4 in backset). Reviewers consistently report 10–20 minute installs, though community threads warn that doors with nonstandard bore holes or metal doors can complicate things.