A housing for a laser processing machine to treat, by means of a laser, work pieces , in particular metal work pieces; the housing comprises: - a dividing wall , which separates a first work space having a first length (E1) and a second work space having a second length (E2) from one another; wherein the first work space and the second work space are configured to receive the work pieces ; - a first entrance to allow access to the first work space ; - a second entrance to allow access to the second work space ; - a closing device (19; 20), which is configured to selectively open and close the first entrance and the second entrance ; and - a control unit, which is operatively connected to the closing device (19; 20); characterized in that the dividing wall is placeable in an operating position, which is variable among at least a first position, a second position and a third position; wherein the first length (E1) and the second length (E2) vary as a function of the operating position; wherein the control unit is configured to control the closing device (19; 20) as a function of the operating position of the dividing wall ; wherein the housing further comprises a sensor device, which is operatively connected to the control unit and is configured to determine the operating position of the dividing wall ; wherein the control unit is configured to control the closing device (19; 20) as a function of the operating position of the dividing wall as determined by the sensor device. the housing comprises: - a dividing wall , which separates a first work space having a first length (E1) and a second work space having a second length (E2) from one another; wherein the first work space and the second work space are configured to receive the work pieces ; - a first entrance to allow access to the first work space ; - a second entrance to allow access to the second work space ; - a closing device (19; 20), which is configured to selectively open and close the first entrance and the second entrance ; and - a control unit, which is operatively connected to the closing device (19; 20); - a dividing wall , which separates a first work space having a first length (E1) and a second work space having a second length (E2) from one another; wherein the first work space and the second work space are configured to receive the work pieces ; - a first entrance to allow access to the first work space ; - a second entrance to allow access to the second work space ; - a closing device (19; 20), which is configured to selectively open and close the first entrance and the second entrance ; and - a control unit, which is operatively connected to the closing device (19; 20); characterized in that the dividing wall is placeable in an operating position, which is variable among at least a first position, a second position and a third position; wherein the first length (E1) and the second length (E2) vary as a function of the operating position; wherein the control unit is configured to control the closing device (19; 20) as a function of the operating position of the dividing wall ; wherein the housing further comprises a sensor device, which is operatively connected to the control unit and is configured to determine the operating position of the dividing wall ; wherein the control unit is configured to control the closing device (19; 20) as a function of the operating position of the dividing wall as determined by the sensor device. <EOS>