Straight run stairs are the most common type of stairs. they have no turns in them and the cost little money to build. What is bad about them sometimes is you need a long open space and not every house had that.
'L' shaped stairs have one landing or platform somewhere on the steps and it has one turn on them. These stairs cost more money to make. ar nice when you don't have all the room in the world.
Double 'L' stairs have 2 landings in themn along wiht two platforms. This type is used when there is very little space available. Cost more money because there are more materials.
Winder stairs have no landings on the whatsoever. They have pie shaped treads and are used when there is no space available. Also these stairs are not safe.
'U' shaped stairs have one landing that makes a person turn 180 degrees. Both flights of steps are parllel to one another. There are two styles called wide and narrow 'U'.
Spiral stairs are used when very little space is available. This type of stair is gaining popularitly very fast in the modern houses. They are not very safe and usually have winder steps.
Circular stairs have an irregular curve and arc that goes with them. They have trapazoid steps and are very very expensive because they have to be custom made.
