(1)Should a building, or a room in a building be in the opinion of the Board unfit for human habitation in consequence of the want of proper means of drainage or ventilation or otherwise, the Board may, by notice, prohibit the owner or occupier thereof from using the building or room for human habitation or suffering it to be so used either absolutely or unless, within a time to be specified in the notice, the effects such alteration therein as is specified in the notice.