You may be like most folks. I’m guessing you give very little thought to the stairs you go up and down on a regular basis.

There are three common types of stairs and these include concrete, metallic and wooden stairs. These are placed according to the style, location and the structure where you want them to be. Steel ...

This half-scale model of a spiral staircase by American studio Matter Design is made from concrete treads that slip neatly over each other. Above and top: photograph by Brandon Clifford The Helix ...

Lloyd Alter is Design Editor for Treehugger and teaches Sustainable Design at Ryerson University in Toronto. Alternating tread stairs are terrific for saving space; you only put one foot on a tread at ...