Do you mean a lift(spans only one floor or less) or do you mean an actual elevator(greater than 8 foot span)? The lift is lots cheaper. But, check with your locals as they might operate under different definitions. The estimate for our church elevator spanning 14 feet was over $60k. We went with a partial solution of a concrete ramp for less than half the cost.
what I mean is the ability to traverse from floor 1 to floor 2, safely. Our stairs are too narrow (door) at the top, so we have to go with an elevator. Lift is a British word, sorry.
We want a simple, safe means that elderly parents will feel good about using.
Thanks.