N.C. Gen. Stat. § 44A-9
A claim of lien on real property authorized under this Article shall extend to the improvement and to the lot or tract on which the improvement is situated, to the extent of the interest of the owner. When the lot or tract on which a building is erected is not surrounded at the time of making the contract with the owner by an enclosure separating it from adjoining land of the same owner, the lot or tract to which any claim of lien on real property extends shall be the area that is reasonably necessary for the convenient use and occupation of the building, but in no case shall the area include a building, structure, or improvement not normally used or occupied or intended to be used or occupied with the building with respect to which the claim of lien on real property is claimed.
N.C. Gen. Stat. § 44A-9