(a) Each 1-family and 2-family dwelling, mobile home, modular home, and townhouse shall have smoke detection devices and/or smoke detection systems installed according to the following requirements:
(1) For each new building or occupancy built after July 8, 1993, smoke detection devices shall be installed in accordance with the provisions of the State Fire Prevention Regulations and the building codes in effect at the time of new construction.
(2) For all buildings or occupancies erected or built prior to July 8, 1993, each required smoke detection device shall be installed outside each sleeping area in the immediate vicinity of the bedrooms and shall be installed on each additional story of the family living unit, including basements, but excluding crawl spaces and unfinished attics, if nothing is stored or kept in such area; but the smoke detection devices in existing buildings or occupancies may be single-station, individual smoke detection devices, approved by Underwriters Laboratories or the Factory Mutual Association, and powered by a monitored battery power supply in accordance with Delaware Fire Prevention Regulations.
(b) Nothing contained in this section shall prohibit the owner of any 1-family or 2-family dwelling, mobile home, modular home or townhouse from installing an inter-connected smoke detection system, hard-wired to the building's electrical system.