Dependant on my research, the overall HDB hotline is 1800-225-5432 . It's really a Department Office Services Line that operates on weekdays from 8:00 AM to 5:00 PM. In addition, you'll find other Speak to figures for certain companies: * HDB Major Line: 6490-1111 (for standard enquiries, weekdays 8:30 AM https://hdbtowncouncilhotline210211100.full-design.com/hdb-town-council-hotline-210-22-79531068