The Building Regulations (Northern Ireland) Order 1979 (NI 16)
8.—(1) If, immediately before the appointed day, approved work is proposed to be carried out by or on behalf of a Crown authority (whether or not in relation to a Crown building) the fact that, on or after the appointed day, the work may be carried out by or on behalf of a health and social services body or an HSS trust shall not prevent it continuing to be regarded for the purposes of the Building Regulations (Northern Ireland) Order 1979 as work carried out by a Crown authority.
(2) Subject to sub-paragraph (3), expressions used in sub-paragraph (1) have the same meaning as in Article 22 of the Building Regulations (Northern Ireland) Order 1979 (application to Crown).
(3) Any reference in sub-paragraph (1) to approved work is a reference to work in respect of which, before the appointed day, either a contract for carrying it out was entered into or all necessary design certificates were signed in accordance with arrangements relating to compliance with the substantive requirements of building regulations by Crown authorities.