Prefabricate house

Selecting the structural core is vital for longevity. For high-rise or permanent residences, prioritize Light Gauge Steel (LGS) frames due to their anti-corrosion properties and seismic resistance. For temporary site offices or low-cost housing, Galvanized Steel frames with Sandwich Panels (EPS, Rockwool, or PU) are more economical. Ensure the steel thickness meets a minimum of 1.2mm to 3.0mm depending on the load-bearing requirements.

Insulation directly impacts energy efficiency. In cold regions, use Polyurethane (PU) foam panels as they offer the highest R-value (thermal resistance). For fire-prone areas, Rockwool sandwich panels are essential due to their non-combustible properties (Class A fire rating). In tropical climates, ensure the roof includes reflective foil and a ventilation gap to reduce heat absorption.

Buyers must verify that the supplier adheres to ISO 9001 for quality management and CE certification for European markets. For the US market, ensure materials meet ASTM standards and local snow/wind load codes. Always request structural calculation reports validated by a third-party engineer to ensure the house can withstand local wind speeds (e.g., up to 120km/h or higher in coastal zones).

A high-quality prefabricated house should have a design lifespan of 20 to 50 years. Check for hot-dip galvanization on all steel components to prevent rust. For exterior wall cladding, Fiber Cement Board or Metal Carved Panels are preferred for their UV resistance and waterproof capabilities. Ensure the supplier provides a warranty of at least 5-10 years on the main structure.

Professional suppliers should provide BIM (Building Information Modeling) or CAD drawings for approval before production. Ensure the supplier can pre-install electrical conduits and plumbing pipes within the wall panels to save on-site labor costs. Verify if they offer modular bathroom units and integrated kitchen cabinets to provide a 'turnkey' solution.

Use Secure Payment services provided by reputable platforms like Made-in-China.com to ensure funds are only released upon proof of shipment. Conduct a third-party factory audit (such as SGS or Intertek) to verify the supplier's production capacity and legal business license before making a large down payment.

Prefab houses are typically shipped as Flat-Pack (SOC) or Knock-Down (CKD). Ensure all glass components are packed in reinforced wooden crates. Request the supplier to use protective film on all painted surfaces and provide a detailed packing list with numbered components to facilitate easy unloading and inventory checks at the destination port.

Consult with a local customs broker to determine the correct HS Code (typically 940690). Be aware of Anti-Dumping Duties that may apply to steel products in certain countries. Ensure the supplier provides a Certificate of Origin (CO) to potentially benefit from Free Trade Agreement (FTA) tariff preferences.

Negotiate based on Total Cost of Ownership (TCO) rather than just the unit price. Ask for volume discounts if ordering more than 5 units. You can often reduce costs by standardizing window and door sizes to match the supplier's existing inventory, which reduces custom fabrication fees.