When to Remove Walls in Prefabricated Houses

There is no uniform standard for when to remove walls or demolish prefabricated houses; instead, it is determined based on the house's level of danger, disaster resilience, and urban planning needs. It can be divided into the following four categories:

1. Grade D Dangerous Houses Must Be Demolished
Prefabricated houses identified as Grade D dangerous houses by professional institutions, due to their load-bearing structures no longer meeting safety requirements, pose severe risks to the entire building and must be demolished or rebuilt. For example, houses with foundation settlement exceeding 5 centimeters, load-bearing wall cracks wider than 1 millimeter, or earthquake resistance levels below 70% of current standards are classified as Grade D dangerous houses. The demolition of such houses is for safety reasons to avoid collapse risks.

2. Houses with Substandard Disaster Resilience Are Prioritized for Renovation or Demolition
If the earthquake resistance of a prefabricated house is below 70% of current standards or it is vulnerable to damage in floods (e.g., due to low-lying terrain or drainage system defects), it may be prioritized for renovation or demolition. For example, older prefabricated houses that do not meet local earthquake resistance requirements may have their safety enhanced through reinforcement, but if the structure is severely aged, they may be directly demolished and rebuilt.

3. Houses Affecting Urban Planning May Be Demolished
Prefabricated houses located within the planning scope of major infrastructure projects such as subways and elevated highways may be demolished to ensure the implementation of overall urban planning. Such demolitions are usually accompanied by land acquisition or functional adjustments and are not directly related to the structural safety of the houses themselves, but must be carried out through legal procedures.

4. Grade C Houses Are Mainly Reinforced and Repaired
Prefabricated houses with local load-bearing structures not meeting safety requirements (Grade C) are usually made safe through reinforcement and repair rather than direct demolition. For example, when load-bearing walls have minor cracks or local settlement, methods such as grouting reinforcement and adding supports can be used to repair them, extending the service life of the houses.

Key Conclusion: The decision to remove walls or demolish prefabricated houses should be based on a combination of safety assessment results (Grade C or D), disaster resilience, and urban planning needs, and is not directly related to the age of the house or its name. Residents who need to understand the specific handling methods for their houses should contact local housing and construction departments or professional assessment institutions for evaluation.