Officials are investigating after a one-alarm fire destroyed a home under construction in Etobicoke on Friday morning.Toronto Fire crews responded to the scene on Netherly Drive, near Kipling and Finch avenues, just before 7 a.m.When firefighters arrived, they found the home fully engulfed in flames, which also spread to a shed. The fire has since been extinguished.The cause of the fire is not yet known.No injuries were reported.