House Evaluation of Prefabricated Panels

The evaluation of prefabricated panel buildings is primarily based on the 'Standard for Dangerous Building Appraisal' JGJ 125 - 2016, which classifies them into four safety levels: A, B, C, and D. The evaluation process includes structural safety assessment, issuing a safety assessment report, and government approval and publicity.

Safety Level Classification:

• Level A: The structural load-bearing capacity meets normal usage requirements, with no dangerous components. These buildings have intact structures and only require cooperation with community renovation projects, such as replacing aging water pipes, adding exterior wall insulation, and installing elevators, without the need for demolition.
• Level B: Some structural components have aging risks but do not affect the safety of the main structure, putting them in a 'sub-healthy' state. They can be repaired and reinforced without affecting occupancy. For example, Hangzhou Cuiyuan District 1, with a building age of over 30 years, was appraised as Level B. After renovation, exterior walls were insulated, corridor lights were installed with sensors, and underground pipelines were replaced, with residents staying and property prices rising.
• Level C: Some load-bearing structures do not meet safety requirements, with local hazards constituting partial dangerous buildings. About 48,000 households nationwide fall into this category, with the priority solution being reinforcement. Demolition is only considered when the reinforcement cost exceeds 70% of the reconstruction cost.
• Level D: The load-bearing structure no longer meets safety requirements, constituting an entire dangerous building. About 72,000 households nationwide, accounting for less than 4%, fall into this category. These buildings have no renovation value, and policies clearly mandate their demolition.

Evaluation Process:

• Structural Safety Assessment: Conducted by professional institutions on key parts such as walls, floors, and foundations, this is the core of the evaluation process, accurately determining the safety status of the building structure.
• Issuing a Safety Assessment Report: Based on the structural safety assessment results, it clarifies the structural condition, safety hazards, and demolition recommendations, providing a scientific basis for subsequent handling.
• Government Approval and Publicity: Ensures residents' right to know and solicits their opinions, making the evaluation results and handling plans more reasonable and transparent.

Currently, there are approximately 18.5 million prefabricated panel buildings nationwide, with Level A and B buildings accounting for 72%, and Level D dangerous buildings less than 4%. Most prefabricated panel buildings can only be retained and renovated as they do not meet demolition standards.