Abstract: An insulated geodesic dome comprising a plurality of closed triangular building construction panels of two kinds wherein the panels of the first kind are smaller than the panels of the second kind, and wherein each panel comprises a triangular frame having outside and inside covers adapted to cover the frame and to provide structural strength and rigidity to the frame. A plurality of spaced apart notches is provided along each edge of each cover. During assembly of a dome, edges of panels are butted together with notches of adjoining panels aligned opposite one another. Adjoining panels are assembled together using metal straps and screws placed in the notches. An angular recess is provided along the bottom outside edge of each frame so that a channel adapted to receive an electrical conductor cable placed therein is formed when any two panels are assembled together.