| 1 | Legal business qualification | Confirm that the supplier is a legally registered manufacturing or trading entity and that its registered business scope covers prefabricated, modular, or related construction products. | Chinese business registration records and applicable export documentation. | 10% | Business license copy, registered address, factory address, export record, and authorized signatory information. |
| 2 | Structural engineering capability | Check whether structural calculations cover the frame, lifting points, floor loads, wind loads, snow loads, seismic conditions, and transport forces for the destination region. | Project-specific engineering review and the building codes applicable at the installation site. | 15% | Signed structural drawings, engineering calculations, material specifications, weld procedure records, and third-party inspection reports. |
| 3 | Container dimensions and transport compatibility | Verify external dimensions, gross weight, corner fittings, lifting points, loading method, and whether the unit can be shipped using the proposed transport arrangement. | ISO freight-container dimensional conventions may be relevant where standard container transport is used; local carrier requirements also apply. | 10% | Dimensioned drawings, packing list, verified gross mass, lifting plan, loading photos, and shipping quotation. |
| 4 | Material quality and corrosion protection | Assess steel grade, coating system, weld quality, drainage design, insulation protection, and suitability for coastal, humid, cold, or high-UV environments. | Material certificates and a corrosion-protection system selected for the installation environment. | 12% | Mill certificates, coating data sheets, paint-system details, weld inspection records, and surface-treatment procedures. |
| 5 | Thermal and moisture performance | Compare insulation thickness, thermal-bridge treatment, vapor control, roof and floor insulation, condensation prevention, and water-resistance details. | Performance should be matched to the destination climate zone and applicable energy or building regulations. | 12% | Wall, roof, and floor sections; insulation type and density; U-value or R-value calculations; waterproofing test records. |
| 6 | Electrical and plumbing safety | Verify voltage, frequency, wiring protection, grounding, residual-current protection, circuit capacity, pipe materials, drainage, and testing procedures. | The electrical and plumbing systems must comply with the destination country's rules; Chinese specifications alone may not be sufficient. | 15% | Single-line diagrams, circuit schedules, component certificates, pressure-test reports, insulation-resistance results, and installation manuals. |
| 7 | Fire and life-safety provisions | Review interior-material reaction to fire, escape doors and windows, smoke alarms, emergency lighting, fire-stopping, and access for occupants and emergency services. | Final compliance depends on the destination jurisdiction, occupancy type, and local approval process. | 12% | Fire-test reports, material classifications, escape-route drawings, smoke-alarm specifications, and local code compliance statement. |
| 8 | Factory quality-control system | Evaluate incoming-material inspection, production checkpoints, dimensional checks, leak testing, electrical testing, final inspection, and nonconformance handling. | A documented quality-management process provides stronger traceability than photographs or verbal assurances. | 10% | Quality manual, inspection and test plan, batch records, corrective-action reports, and independent pre-shipment inspection option. |
| 9 | Customization and production capacity | Confirm engineering change control, prototype capability, minimum order quantity, realistic monthly capacity, lead time, spare-part availability, and installation support. | Capacity claims should be verified through a factory audit, production records, and a written project schedule. | 7% | Production plan, engineering-change procedure, sample approval process, staffing information, lead-time commitment, and spare-parts list. |
| 10 | Commercial terms and after-sales support | Compare total landed cost, payment terms, Incoterms, warranty scope, exclusions, installation responsibility, claims process, and response time for defects. | Warranty duration and remedies must be defined in the sales contract; they are not automatically guaranteed by product type. | 7% | Itemized quotation, Incoterms, payment schedule, warranty document, installation scope, insurance details, and reference-project contacts. |