This is the Piwnica icon for Windows 10. Here we go. Optimized for 32x32 px, these are the simplest icons in the line style. Downloadable formats are PNG and SVG, among others. Icons8 icon pack is unique in providing a huge number of icons designed by the same team of four designers who create the new icons every working day in the same style and with the same quality. Same cool as the Bat Face, huh.
The icon for a basement is a house with a window and a door and under it has a rectangle smaller than the one used for the shape of the house and inside it is a stairs to represent the stairs use to go down to a basement.