Stair lifts date all the way back to the 1930s. Today you will find two types of stair lifts referred to as straight or curved stair lift. You can get these lifts for both indoor and outdoor use. Straight stair lifts are fairly simple in that they will be secured to the stairs and plug in to a wall outlet. If you have a curved staircase you can expect a more expensive price tag because it will be built custom for your staircase. No matter how many stairs you might have between you and the top, you can be sure to have different pricing options from the many manufactures that build them today.