1. In this Order—N.I.
“material change of circumstances” means a change of circumstances which consists of—
the coming into occupation of a newly erected or newly constructed hereditament or of a hereditament which has been out of occupation on account of structural alterations; or
a change in the value of a hereditament caused by the making of structural alterations or by the total or partial destruction of any building or other erection by fire or any other physical cause; or
the happening of any event whereby—
any property or part of any property begins, or ceases, not to be treated as a hereditament; or
any hereditament or part of any hereditament begins or ceases to be entitled to be distinguished in the valuation list in pursuance of Article 41, 42 or 43; or
property previously valued as a single hereditament becoming liable to be valued as two or more hereditaments; or
property previously valued as two or more hereditaments becoming liable to be valued as a single hereditament; or
a hereditament becoming or ceasing to be a dwelling-house; or
a hereditament being used to a greater or lesser extent for the purposes of a private dwelling or private dwellings.