A typical, straight line chair lift will cost between $3,000 and $4,000, depending on power source and amenities. Installing a special stair lift, such as ones installed on a spiral stairway or 90 degree turn stairway, may increase the cost to as much as $12,000.These prices include installation; most companies will include installation as part of the price of the chair lift.f you or a loved one has trouble getting up and down the stairs without assistance then it may be time for you to buy a stair chair lift. It is not expensive as you may think to buy a chairlift. Often, you can get your insurance carrier to help with the cost.