Based upon my research, the final HDB hotline is 1800-225-5432 . It is a Branch Place of work Provider Line that operates on weekdays from eight:00 AM to 5:00 PM.Moreover, you will discover other Call quantities for unique services:* HDB Main Line: 6490-1111 (for general enquiries, weekdays eight:thirty AM - five:00 PM)* Vital Upkeep Support Un