A wheelhouse cladding step assembly includes a step movable between a closed position and an open or deployed position in which the step is located proximal the wheelhouse of the vehicle and provides improved access to the roof and/or rooftop cargo storage of the vehicle. The step is designed to have a shape matching the shape of the wheelhouse of the vehicle and is preferably curved and when in the closed position shows a surface that matches the vehicle trim to hide the step. The assembly includes hinges and a latching mechanism that are also contained within the assembly so they are hidden when the step is in the closed position.