4. The Building Regulations (Northern Ireland) 1994(1) shall continue to apply to—
(1) plans deposited in accordance with those regulations before 1st April 2001;
(2) building work and any material change of use carried out in accordance with such plans with or without any departure or deviation from those plans; and
(3) building work and any material change of use completed on or after 28th November 1994 but before 1st April 2001, other than work to which building bye-laws continue to apply in accordance with paragraph 2 of Schedule 2 to the Building Regulations (Northern Ireland) Order 1979 and work to which the Building Regulations (Northern Ireland) 1973, 1977 and 1990 continue to apply by virtue of paragraphs 1, 2 and 3.
S.R. 1994 No. 243 (N.I.) as amended by S.R. 1995 No. 473, S.R. 1997 No. 481 and S.R. 1998 No. 453