Leopold's house is the only location where most of the events/actions of the episodes happen, located and set in various fictional and real life locations. It is sometimes drawn in Ms Paint/Paint or other programs, but most commonly, the background of the PC Spielen video is used.
Leopold in his room
Leopold's house in Steven1991's series
Leopold's house in Jeeves476' series
Angry German Kid's House from sparkybigptalkshow's Angry German Kid series, but Brian Chiem and AGKandvideomaker2000 also shared this. This is actually a house in Markham, Ontario in real life.
Leopold's house in TheWindows2000Guy's series
Leopold's trailer in SBPTS Remake.
Leopold's house in Margaretka4356's series.
The real Slikk family house in SBPTS Angry German Kid