1. The Building Regulations (Northern Ireland) 1973(1) shall continue to apply to—
(1) plans deposited in accordance with those regulations before 1st October 1977;
(2) work carried out in accordance with such plans with or without any departure or deviation from those plans; and
(3) work completed on or after 1st October 1973 but before 1st October 1977, 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.
S.R. & O. (N.I.) 1973 No. 105 as amended by S.R. & O. (N.I.) 1973 No. 506 and S.R. 1975 No. 112