HDB lift door openings are the real limit at roughly 90cm wide by 209cm tall. Standard HDB doors measure 91.5x213cm but corridors often turn tighter than the doorways themselves. Leave a 2-5cm buffer when carrying large beds through narrow stairwells or tight lifts. It's crucial to check access routes before delivery day to avoid having it returned.
Queen size mattresses measure 152x190cm which fit most HDB master bedrooms comfortably. Leave around 60cm clearance on the exit side for easy movement through the room. Super Single frames work well in smaller BTO bedrooms where space is tight. It's best to measure your room before buying to ensure the frame fits your layout properly without blocking doors.