Determined by my lookup, the overall HDB hotline is 1800-225-5432 . This is a Department Business Service Line that operates on weekdays from 8:00 AM to five:00 PM. Additionally, you'll find other Speak to figures for distinct companies: * HDB Major Line: 6490-1111 (for normal enquiries, weekdays 8:30 AM - https://horacec219nbn4.wikicarrier.com/user