Ind. Code § 22-11-18-3
(f) All single level dwellings, all seasonably occupied dwellings, and all hotels and motels with twelve (12) sleeping rooms or less (and containing no interior corridors) are exempt from the requirements of subsections (c), (d), and (e). In all such units:
(2) the detector may be battery operated.
If a battery operated detector is installed, it must contain a tamper resistant cover to protect the batteries. The fire marshal shall adopt rules detailing the specifications for the tamper resistant cover. If a battery operated detector is not installed, the detector must be hard wired into a building's electrical system.
As added by Acts 1982, P.L.141, SEC.1. Amended by P.L.237-1983, SEC.3; P.L.176-1991, SEC.3.