The 40FT Expandable Container House is the flagship model in the series, offering the largest usable area. After expansion, it provides generous overall space, meeting the living needs of a large family or serving as an integrated office and living area. Standard configuration includes three or four bedrooms, one living room, one kitchen, and two bathrooms. Some high‑end configurations can add a balcony, solar power system, and rainwater collection system for off‑grid self‑sufficiency. Zhongyi Zhiji’s 40FT Expandable Container House uses reinforced galvanized steel frames and thicker insulated sandwich panels for higher structural strength. It is suitable for large construction project offices and accommodation, permanent buildings for overseas aid bases, luxury suites in high‑end tourist resorts, and owner‑built family homes – scenarios demanding high space and quality.