Abstract: A helicopter shelter in the form of an elongated generally rectangular building having a floor defining a landing pad and a superstructure including side and end walls extending upwardly from the side and end edges, respectively, of the floor and a roof cooperating with the floor and walls to define a secure, substantially weathertight enclosure. The superstructure is divided substantially along its longitudinal vertical center plane into two complementary half-sections each supported for pivotal movement about longitudinal axis extending adjacent the side edges of the floor between a closed upright position and an open position folded downward and outward. The end wall portions of the respective half-sections of the superstructure fold inward along a diagonal line extending from their lower outside corners to their upper inside corners when the half-sections are pivoted to the open position to facilitate flying onto and off of the landing pad.