Deck is outside, marble inside... you can use wood or composite, its done that way all the time and that is the most common materials... with that said you can also use Aluminum Decking, PVC Decking, Stone or Tile Flooring System, etc. Good luck

I would not choose glossy black tiles for an outdoor floor. I think the tiles would get very hot to walk on in the summer. If they are glossy, they might be slippery when wet. They would also get dusty and need to be wiped often.

Hi Vishnu, The thing that can be done is either the outdoor unit can be covered with a grill or tuck inside if some setback is there ( a recess in the wall) to align with the wall or if the possibility of putting it on the terrace is there than nothing like it. All this depends on the elevation and the plan of the existing building. Or a partition wall can be provide which can add to the elevation. Thanks and regards Riddhish

Shubham, Are you opening a tile and marble shop ? Well you would know the materials then ;) These are called garden paving stones . And a 'Sadarahalli Grey' machine cut will be a close match to the pic shared. Stones are often named differently in different geo's. It's called sadrahalli in Bangalore region. thanks, Nitin Cornerstone Designs. Bangalore.