2. A building the construction of which began after 24 January 1987 shall conform to the Code as amended by this Regulation.
The first paragraph of this section also applies to an alteration as defined in the Code or to an addition made after the 24 January 1987 to a building built before that date.
The Regulation respecting the application of a Building Code (O.C. 912-84, 84-04-11) may apply to such a building, to its alteration or addition where work begins before 24 January 1988.