Enacts new GS 106-806 to allow a swine house that is a component of a preexisting swine farm to be constructed or renovated as long as the construction or renovation: (1) does not result in an increase in the permitted capacity; (2) does not result in requiring an increase in the total permitted capacity of the animal waste management systems; and (3) does not result in any portion of the constructed or renovated swine house being located any closer to the building or property that is the object of the siting requirement that the house fails to meet, if the swine house fails to meet siting requirements under GS 106-803. With written permission from the property owner that is recorded with the register of deeds, allows construction or renovation that results in part of the swine house being located closer to a residence, school, hospital, church, or a property boundary. Provides that the act does not apply to the construction or renovation of a swine house that is a component of a new swine farm. Applies to construction or renovation that occurs on or after the date that the act becomes effective.