China Prefab Steel Sandwich Panel Container Worker House with Toilet. Customized Electrical System: Electrical system can be tailored to specific client requirements and standards. Customized Color Options: Various color options available to match specific design preferences. Easy and Fast Installation: 4 to 5 workers can install one 20ft house in a few hours with pre-installed systems. Flat Pack for Easy Transport: Designed for flat-pack transport, allowing 4 sets per 20ft GP or 8 sets per 40ft HC. Re-usable and Removable: Structure is removable for reutilization, making it environmentally friendly. ISO and CE Certified: Meets international standards with ISO, CE, BV, and SGS certifications. Customized Size Available: Standard 20ft and 40ft sizes available with custom dimensions welcome. Professional Design Service: Over 200 design engineers provide full solution drawings using Auto CAD and Tekla.