Wood staircase on the mid level of a home that continues on multiple levels - Scott Prokop/Shutterstock Whether a major feature of the entryway or tucked to the sides of the home, the staircase offers ...

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 ...