is it a curved staircase? What is the highest point of the staircase? maybe you can do something like this image:

Hello Ramakrishna M, This question sounds more for a structural engineer. Also you will need to check if it is legal to do it in your house in the first place especially if you are planning to make an RCC staircase. An Interior designer can help to beautify your space and provide advice on the planning at the max. I could not answer your question directly but hope it puts you in a better direction. If you need Interior Design services feel free to contact us: 9820942680, designospire@gmail.com, Follow us on Facebook @designospireIDS www.designospire.com

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.

Hello there, You could use MS square sections to create an array of shutters which will conceal the entire area, look contemporary and would be helpful in ventilation too. You could continue the whole thing towards the end and carve a simple cut-out from the shutter using MS sections and only a pair of hinges attached to the wall where stairs begin. You could also achieve the same feat with CNC cut jaalis, expanded metal mesh, concrete louvers etc. There is a wide spectrum of options you could consider depending on your budget. Regards, Aurum Ideas and Spaces Bhubaneswar