You should contact a staircase contractor to provide info and pricing for this cantilever stair design. http://www.caliperstudio.com/fabrication/project-types/stairs/stone-cantilever-stair

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sararahim123 What constitutes an adequate illumination level varies from person to person. What exactly do you require illuminated? If its simply ambient light you would have tiny lights as shown that throw light on the stairs itself. If a bit more is required you could consider adding a railing with a light under. If general illumination is what you are going after, but in a muted way, would suggest wall scones that throw light upwards onto the ceiling, diffusing the light.

Hi You can add staircase But not in that place. It must be planned properly as structure is a key factor.