Whether your stairs are straight, go around a corner, or up a spiral staircase, give us a call so we can decide on the right stairlift for you, you should arrange a free no obligation quote. This is where stairlift surveyor will visit your home and advise which model would be best suited to your staircase.  Stannah offers two chairs, designed so that your knees don’t hit anything if you do have a narrow staircase: The Sadler is a perch seat allowing you to ride in a more upright position. Whereas the Siena has a curved seat back allowing you sit further back in the chair.