How to Inspect Online-Purchased Prefabricated Houses

The inspection of online-purchased prefabricated houses requires a systematic approach that combines delivery milestone checks, common pitfall identification, contract verification, and tool usage. The specific process is as follows:

I. Delivery Milestone Inspection

1. Plan Freeze: Verify that the floor plan, exterior rendering, and configuration list (such as decoration materials and equipment brands) in the contract match the actual delivery to prevent unauthorized design modifications by the manufacturer.
2. Factory Inspection: Check the main structure of the house for dents or scratches; ensure doors and windows open and close smoothly and that the sealing strips are intact; verify that electrical and water interfaces (such as socket and water pipe预留位) meet standards to avoid damage during transportation.
3. Packing List Verification: Check each component's number and quantity against the packing list, focusing on verifying that spare parts are included for fragile items (such as glass and hardware) to prevent installation delays due to missing parts during transportation.
4. On-Site Installation Supervision: Record the installation cycle (such as the duration of main structure construction and interior decoration) and whether the staffing is reasonable; check daily progress against contract agreements to avoid delays.
5. Water and Electricity Joint Testing: Use an electrical tester to check socket power, conduct pressure tests to check water pipe pressure resistance; ensure lighting, drainage systems (such as floor drains and toilet drainage) are unobstructed, and that equipment (such as air conditioners and water heaters) operates normally.
6. Waterproofing and Sealing Inspection: Conduct a 24-hour closed water test on bathrooms, roofs, and around doors and windows to check for leaks; test sealing by placing an A4 paper in the door or window gap; if the paper can be easily pulled out, rectification is needed.
7. Final Delivery Inspection: Verify problem rectification timelines (such as leaks must be repaired within 48 hours) and warranty details (such as the warranty period for the main structure) according to contract standards to ensure clear rights and interests.

II. Key Pitfall Identification

1. Bathroom: In addition to waterproofing tests, check that the floor drain slope is reasonable (to avoid water accumulation) and that the exhaust fan is not installed backward (to prevent odor backflow).
2. Door and Window Sealing: Inspection during rainy weather is ideal; observe for water stains around window frames; in winter, feel for drafts with your hand, as poor sealing increases energy consumption.
3. Noise and Comfort: Test indoor noise levels with doors and windows closed (such as below 45 decibels for houses near roads); confirm that wall sound insulation materials meet standards to avoid poor living experiences.

III. Contract and Boundary Confirmation

1. Clear Delivery Scope: Require the manufacturer to mark items "included in the contract" (such as basic decoration and furniture) and items "requiring additional payment" (such as landscaping and smart devices) in the contract to avoid last-minute price increases.
2. Milestones in Appendices: Write the time and standards of the 10 delivery milestones (such as plan freeze and factory inspection) into the contract appendices as inspection references.

IV. General Tools and Tips

1. Essential Tools: Bring the contract, payment receipts, and ID card; prepare tools such as a level ruler (to measure wall perpendicularity), electrical tester, tape measure, and spirit level.
2. Problem Recording: Take photos of any issues found as evidence, fill out an inspection form, and have the manufacturer sign it to confirm; specify rectification deadlines (such as waterproofing issues must be repaired within 2 days).
3. Professional Assistance: If inexperienced, contact a third-party supervision agency or refer to the inspection standards in the Residential Quality Guarantee to ensure compliance with the process.