Section 27-731
§ 27-731 Alterations. No building, or part thereof, shall hereafter be
altered or rearranged so as to reduce any of the following to less than
the required standards prescribed in this subchapter for buildings
hereafter erected:
(a) The amount of available natural or artificial light.
(b) The output of devices providing heat to a room.
(c) The outdoor air supply.
No additional room shall be created unless made to conform to the
requirements of this subchapter except that in basements of one family
dwellings existing on January first, nineteen hundred eighty-two and in
basements of all other dwellings existing on January first, nineteen
hundred forty-eight, the minimum clear ceiling height may be seven feet
for the minimum area. In multi-family dwellings, the installation of all
new mechanical equipment shall conform to the requirements of article
nine of this subchapter except that existing mechanical equipment may be
replaced with new equipment of the same kind as previously installed.
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