4 feet
2756
a ladder or a flight of stair
Flight of stairs and Fleet of ships.
12-17
A flight of stairs in it's entirety is a staircase
stair and stare
Minimum tread is 10" and maximum riser is 7.75".
Stares and stairs or Stare and stair
Generally, a stair lift can be installed professionally for about $3500 for a standard lift, on a straight set of stairs and only a single flight. Turns and non-standard stair configuration will increase the price substantially.
Normally 7" rise and 11" run.
Supported minimum size
A hand truck with a stair climber built in.