Based on my lookup, the final HDB hotline is 1800-225-5432 . It's a Branch Business Support Line that operates on weekdays from 8:00 AM to 5:00 PM. Also, you will find other Speak to figures for precise services: * HDB Primary Line: 6490-1111 (for basic enquiries, weekdays 8:thirty AM - https://marionz097cnw7.wikicorrespondence.com/user