Crane type BMU system comprises a suspended working platform connected to the jib arm of the crane system on the roof. The jib arm of the crane system is attached to a rotating head which allows the suspended working platform to rotate and reach different parts of the façade of the building. A single crane type BMU system installed in the right position can serve the entire façade of the building. Compact crane type BMU system is a variety of crane type BMU system which typically has shorter jib arm that can stay within the rooftop area with smaller rotating range or mounted on tracks.

Roof trolley BMU system is generally light and simple with shorter jib arm while the stability against overturning is achieved either by its own weight or by counterweight. Roof trolley BMU system can be further divided into track type BMU system and trackless type BMU system. Track type BMU system is normally installed on parapet wall-mounted tracks or floor-mounted guide rails, which requires an electrical motor to be driven along the tracks. The tracks are designed to follow the shape of the façade in order to reduce the length of the jib arm. Trackless type BMU system is mobile on roof which can be driven to any desired location for operation and can be easily hidden or concealed.

Monorail BMU system comprises a single track that runs along the exterior façade following the shape of the building. A running trolley is mounted on the monorail track which allows the suspended working platform to move along the building horizontally or with an incline. It can run along the monorail track manually or electrically.

Davit arm BMU system refers to suspended working platform connected to davit arms which can be wall-mounted or floor-mounted. The davit arms can be equipped as rotating to allow the suspended working platform to be manoeuvred to the desired spot, or as telescopic to increase working range over the parapet wall.