[Jason.]

BB1 & BB2
The first two years, the house was located in Bow.
Main house fenced off from crowd. Bridge separating the main house from the crowd.
Evicted housemate would walk from the house, through the bridge, and out into the crowd.

BB3 & BB4
The first set at Elstree. Featured the stairs and the massive white building. The crowds were brought closer to the house. BB4's crowds were fenced off from the house. On Finals a special stage was put up.

BB5
The circular stage in the center of the massive crowds, along with the permanent stage with a massive screen, and outdoor interviewing area. The floor-based door with a semi-circle stage.

BB6 & BB7
The circular stage, connected to black stairs. Face of house featured a built-in screen. BB7's circular stage had diagonal walkways attached. Stage located at one end of the crowd. On Finals a long walkway is attached to the circular stage, leading to the interviewing area stage.
Screen size varied.

BB8
Similar to the previous two series. However, the circular stage moved along with the stairs. The walkway was extended from the house to the stairs.
Stage was in the middle of the crowd, unlike BB6&7, when located at one end of the crowd.

BB9 & BB10
Similar to BB6 and BB7. Introduced the ovular stage, as opposed to the circular stage present in previous years. Stage had the eye, instead of lighting designs.
Crowds decreased in size.
Screens taken down from the front.
BB10 had a small walkway attached into the ovular stage.

BB11
The Circus themed exterior, which featured a red and yellow raised carpet. The stairs changed slightly, along with a screen in front of the house returning. Crowd located at opposite side of the compound.

BB12 - Present
Eye outside the house, connected to walkway, leading to a circular stage. Spiral staircase attached. Rotating eye bridge at the top of the stairs.
Double screens, with eviction door.
Inside the eye, eviction studio, connected to another circular stage, and mini screens.
Stands.

Images