You probably give little thought to the stairs you go up or down to reach different levels of your home, deck or patio. I’ll wager that if I handed you a measuring tape, a framing square, a pencil and ...

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 ...