According to my search, the general HDB hotline is 1800-225-5432 . This is a Department Office environment Service Line that operates on weekdays from 8:00 AM to 5:00 PM.In addition, you'll find other Speak to figures for distinct expert services:* HDB Key Line: 6490-1111 (for typical enquiries, weekdays eight:thirty AM - 5:00 PM)* Crucial Main