A door lock 10 comprises a base 12 comprising one or more screw holes 14 passing through the base 12, a locking bar 16 rotationally connected to the base 12 and extending beyond the base 12, the locking bar 16 having a first locked position covering the one or more screw holes 14 and a second open position not covering the one or more screw holes 14, and a locking mechanism 18, when locked preventing rotation of the locking bar 16 relative to the base 12. The locking bar 16 is mounted on one side of the base 12 and the base 12 further comprises one or more additional screw holes 20 located on the opposite side of the base 12 to the locking bar 16, the additional screw holes 20 not passing through the base 12.