Prefab house

Buyers must prioritize structural integrity and material durability. Key specs include galvanized steel frames (minimum 2.5mm-3.0mm thickness) to prevent corrosion, and sandwich panel walls (EPS, Rockwool, or PU) with a density of at least 50kg/m³ for Rockwool to ensure fire resistance and thermal insulation. Additionally, verify the floor load capacity (typically ≥200kg/m²) and wind resistance ratings (should withstand Grade 10-12 winds depending on the region).

Compliance varies by destination. For the US market, ensure materials meet ASTM standards and electrical components are UL-listed. For the EU, look for CE marking and compliance with EN 1090-1 for steel structures. Globally, suppliers should hold ISO 9001 for quality management and ISO 14001 for environmental standards. Always request fire rating certificates (Class A) for insulation materials to meet local building codes.

Focus on the U-value (thermal transmittance) of the wall and roof panels; a lower U-value indicates better insulation. For acoustic comfort, Rockwool sandwich panels offer superior sound dampening compared to EPS. Ensure the windows are double-glazed tempered glass with vacuum seals to minimize heat loss and external noise infiltration.

A top-tier supplier should provide BIM or AutoCAD architectural drawings for approval before production. They must offer modular scalability, allowing units to be stacked or joined. Integration should include pre-installed electrical conduits, plumbing systems, and sanitary ware that align with the buyer's national standards (e.g., NPT vs. BSP thread types for pipes).

The biggest risks include shipping damage and missing components. Because these are 'kits,' a single missing bag of specialized bolts can stall an entire project. To mitigate this, require the supplier to provide a detailed packing list with photos and use reinforced sea-worthy packaging. Additionally, use Trade Assurance services on Made-in-China.com to secure your payment until shipping documents are verified.

Focus on the Total Cost of Ownership (TCO) rather than just the FOB price. Negotiate for bulk discounts (typically 5-10% for orders over 10 units) and ask for spare parts (extra seals, screws, and touch-up paint) to be included for free. For payment, a 30% deposit and 70% balance against the Bill of Lading (B/L) is standard, but for large projects, consider a Letter of Credit (L/C) for maximum security.

Prefab houses are usually shipped as Flat-pack (SOC - Shipper Owned Container) or 40ft HQ containers. Flat-packs are more cost-effective for shipping as 4 units can often fit into the space of one standard 20ft container. Ensure the supplier has experience with DDP or CIF terms if you are unfamiliar with local customs clearance, and always verify the loading plan to maximize container space utilization.

Always conduct a third-party factory audit (e.g., SGS or Intertek) before placing a large order. Request a pre-shipment inspection where the supplier must fully assemble one unit in the factory to check for alignment and leakage. Utilize the Verified Supplier status on Made-in-China.com to identify manufacturers with proven export track records and audited production lines.