Texas Local Government Code - LOC GOV'T § 241.020. Permits

(1) a new structure is constructed;

(2) an existing structure is substantially changed or repaired;

(3) a new use is established; or

(4) an existing use is substantially changed.

(1) a nonconforming structure may be replaced, rebuilt, or substantially changed or repaired; or

(2) a nonconforming object of natural growth may be replaced, substantially changed, allowed to grow higher, or replanted.

(1) the establishment of an airport hazard;

(2) a nonconforming use to be made;

(3) a nonconforming structure or object of natural growth to become higher than it was at the time of the adoption of the airport zoning regulations relating to the structure or object of natural growth or at the time of the application for the permit; or

(4) a nonconforming structure, object of natural growth, or use to become a greater hazard to air navigation than it was at the time of the adoption of the airport zoning regulations relating to the structure, object of natural growth, or use or at the time of the application for the permit.