🔍 A 4-room HDB flat renovation in Singapore costs $42,000–$70,000 for BTO and $55,000–$85,000+ for resale. The 88–93 sqm layout supports a full open-concept living-dining, a feature wall, kitchen with island option, master bedroom with walk-in or full-height wardrobe, and two secondary bedrooms. This guide covers layouts, style choices, room-by-room costs, and the decisions that matter most. 4-Room HDB Interior Design Singapore 2026: Ideas, Costs & Layouts The 4-room HDB f