Based on my lookup, the final HDB hotline is 1800-225-5432 . It's a Branch Office Assistance Line that operates on weekdays from eight:00 AM to five:00 PM.In addition, there are other Speak to quantities for particular expert services:* HDB Primary Line: 6490-1111 (for standard enquiries, weekdays 8:30 AM - 5:00 PM)* Important Upkeep Provider c