HDB Master Bedroom Design Singapore 2026: 4-Room BTO Ideas, Layouts & Costs 🔍 A 4-room HDB BTO master bedroom is typically 12–14 sqm plus an attached bathroom, and a full master bedroom design costs $6,000–$15,000 in Singapore in 2026. The best layouts put the headboard on the longest solid wall, run a full-height wardrobe wall to wall, use warm 2700–3000K layered lighting, and keep 600mm of walkway on each side of the bed. Merging with the next room for a walk-in wardrobe c