In American English, a stoop is a small staircase ending in a platform and leading to the entrance of an apartment building or other building.

What considered a stoop on a house?

: a porch, platform, or stairway at the entrance of a house or building. More from Merriam-Webster on stoop.

Is there a difference between a stoop and a porch?

Unlike a porch or patio, a stoop usually doesn't have a roof or overhang to protect it—or you—from the rain or sun. Traditionally, stoops were designed as a spot for incidental social encounters. Parents or children might spot a friend on a stoop and have a quick chat or run into neighbors while they relax out front.