Okay, this is all going from memory here since I designed this on the fly and don't have my notes. But, I believe the overall height from floor to top of tile is 11'. The width of the tiled wall is 8'. The fireplace is the 5' wide Heat N Glo 'Red 60' gas direct vent fireplace installed with a power vent. The niche sections of the wall are 28" wide and the niches themselves are 16" wide by 24" tall. The fireplace wall pops out 2 inches greater than the niche sections, which are recessed 3 inches from the sides of the walls on the outside as well.The hearth is cantilevered 12 inches out. We put led lighting that you can't see in this picture very well underneath the cantilever and then uilized lacquered sheet metal to finish the bottom and help reflect the light. The tile on the wall is porcelain, the hearth is quartzite with a 5 inch drop edge. These are all estimates but should be very, very close.