Smoke detectors shall be installed and maintained in accordance with s. 101.645(3), Stats., in a dwelling, for which initial construction commenced before June 1, 1980.
Wis. Admin. Code Department of Safety and Professional Services SPS 328.03
Section 101.645(3), Stats., reads: The owner of a dwelling shall install a functional smoke detector in the basement of the dwelling and on each floor level except the attic or storage area of each dwelling unit. The occupant of such a dwelling unit shall maintain any smoke detector in that unit, except that if any occupant who is not the owner, or a state, county, city, village or town officer, agent or employee charged under statute of municipal ordinance with powers or duties involving inspection of real or personal property, gives written notice to the owner that the smoke detector is not functional the owner shall provide, within 5 days after receipt of that notice, any maintenance necessary to make that smoke detector functional.
Note: The Uniform Dwelling Code under s. SPS 321.09 specifies installation and maintenance requirements for smoke detectors in one- and 2-family dwellings constructed on or after June 1, 1980. The uniform dwelling code also reflects the installation and maintenance requirements specified in s. 101.645(3), Stats.