The Building Regulations - A summary of 2.12 Passenger Lifts The colour and tone of the lift doors should contrast with the surrounding wall finish to assist location of lift doors. A distinguishable floor surface, approximately 1500 mm by 1500 mm, outside the lift doors will aid location. This could comprise a change in floor finish from carpet to vinyl, or timber to carpet. Changes in floor finish must be flush. The lift call button should be wall-mounted adjacent to the lift and colour and tone contrasted with the surrounding finishes. This can be achieved using a contrasting panel, or a contrasting border around the button panel. The floor level should be indicated on the wall adjacent to or just above the call buttons, and opposite the lift doors where possible, using clear colour and tone contrasting numbers in tactile form and with a character height of 100 mm to 170 mm. The minimum internal dimensions should be 1400 mm deep by 1100 mm wide. Where lift dimensions are not sufficient to allow a full turning circle (1500 mm diameter) a mirror should be provided on the wall opposite the lift doors. The mirror should NOT be full length. Internal lighting should provide a level of illumination of minimum 100 lux (approximately 50 - 75 lux at floor level), uniformly distributed, avoiding the use of spotlights. Internal walls should have a non-reflective, matte finish in a colour and tone contrasting with the floor, which should also have a matte finish.