A porch lift from MAC's has a rated weight capacity of 600 pounds and can reach as high as 7 feet. They are often used in place of ramps as they are small, easy to shield from street view, and can be moved when a homeowner moves. A portable porch lift is also available.
A porch lift from BRUNO has a rated weight capacity of 750 pounds, enough to lift a power chair and its rider. One model will reach as high as 14 feet. All of the safety features that you would expect to be on a working elevator are available on a BRUNO vertical platform lift and one model is certified for commercial applications.