The department's order said those reporting after 9.45 am will be considered "late" and every three late entries will cost the employees one casual leave. "It will be deducted automatically," it said.
The employees will have to submit an explanation to the director of the department about the reason for the delay.
"The official reporting time is 9.30 am. Appropriate action will be taken as per rules against officers/officials who are habitual latecomers," WCD Director Shilpa Shinde said in the order issued last week.
The attendance sheet of the staff would be submitted to the director on the first working day of every month.
Last year, Chief Secretary MM Kutty had warned latecomers at the Delhi Secretariat, which houses Chief Minister Arvind Kejriwal's office, offices of his ministers and several departments, including transport, PWD, finance and power.
Mr Kutty directed Secretary (General Administration Department) to keep a watch on the attendance of officials and ensure that they mark themselves present in the biometric attendance system.