Abstract: A fenestration installation adjustment system includes one or more jack sockets configured to couple with a fenestration frame of a fenestration assembly. The one or more jack sockets include a contoured socket profile. One or more adjustment jacks are received in one of the one or more jack sockets. Each of the adjustment jacks includes a contoured jack profile complementary to the contoured socket profile. The adjustment jack and the contoured jack profile are movable relative to the respective jack socket along the contoured socket profile. The adjustment jacks each include an engagement foot configured for surface to surface engagement with a rough opening boundary surface. Movement of the adjustment jack relative to the jack socket is configured to move the fenestration frame according to the relative movement.