A retractable roof apparatus for an autonomous hardtop vehicle is described. The apparatus includes a vehicle roof having an opening to a compartment that extends below the surface of the vehicle roof and a retractable cover assembly that encloses sensor devices. The retractable cover assembly includes a top panel having a peripheral size and shape that matches the roof opening to the compartment. The sensors include an array of cameras having a field of view of the full width of the vehicle in at least the front of the vehicle when the retractable roof cover is in the raised position. The height of the top panel in the raised position above the vehicle roof is a minimal height to accommodate the height of the cameras. When the retractable cover assembly is retracted into the compartment, the top panel is flush with the surrounding roof panel of the vehicle.