422-B:3 Limitation on Structure. –
I. Except as provided in paragraph II, until a permit therefor has been issued by the department, no person shall erect, add to the height of or replace any structure within the areas described in paragraph II of this section which will result in a structure higher than that allowed by that paragraph, nor at any other place in this state which will result in a structure extending more than 500 feet above the highest point of land within a one-mile radius from the structure.
II. In territory surrounding public airports for which zoning ordinances or regulations have been, or hereafter are, made effective by local governmental authorities pursuant to RSA 424, no person shall erect, add to the height of or replace any structure except as allowed by such local zoning ordinances or regulations, but no permit therefor from the department shall be required. Outside of such locally zoned territory and within the area and in accordance with the slope ratios prescribed by the airport approach plan for each airport as adopted by the department pursuant to RSA 424:3, no structure shall be erected, altered by increasing the height thereof or replaced until a permit therefor has been obtained from the department.