How to determine if a fold out house needs major repairs?

Based on your question, I have compiled the main criteria and methods for determining whether a fold out house needs major repairs. fold out houses, as a special form of architecture, have similarities in terms of structural safety assessment with ordinary houses, but attention should also be paid to their unique connecting components and folding mechanisms.
Core judgment basis: Structural safety hazard level
According to the "Technical Points for Safety Inspection of Self built Building Structures (Provisional)", the preliminary determination of safety hazards in houses is divided into three levels, which are the core criteria for determining whether major repairs are needed:
There are serious safety hazards: the foundation of the building is unstable, with obvious uneven settlement, or the load-bearing components have obvious damage, cracks, or deformation, which may lose stability and bearing capacity at any time. The structure has been damaged and there is a risk of collapse. This type of house must be immediately decommissioned and evacuated, sealed off for disposal, and on-site risk management must be carried out. If it is necessary to continue using it, a professional organization must be commissioned to conduct a safety appraisal, and corresponding measures must be taken based on the appraisal conclusion.
There are certain safety hazards: the foundation of the house has no obvious uneven settlement, but some load-bearing components may be damaged, cracked, or deformed, which cannot fully meet the requirements for safe use. Such houses should be restricted in use and must be entrusted to professional technical institutions for safety appraisal, and corresponding measures should be taken based on the appraisal conclusion.
No safety hazards found: The foundation of the building is stable, the main load-bearing structural components have no obvious stress cracks or deformations, the connections are reliable, the load-bearing structure is safe, and basically meets the requirements for safe use. This type of house can continue to be used normally, but regular safety inspections and maintenance are required.
The preliminary judgment conclusion cannot replace the house safety appraisal. For commercial self built houses, the safety hazard investigation must be carried out by professional technical personnel.
Specific investigation content and methods
The safety inspection of building structures mainly includes two parts: foundation safety and upper structure safety.
Foundation safety: Focus on investigating whether there is uneven settlement, instability, and other situations.
Upper structure safety: Focus on checking whether the load-bearing components (such as beams, slabs, columns, walls) and their connections are reliable, and whether there are any "crooked, cracked, twisted, skewed" phenomena between the structural components and the overall building. Visual inspection should be the main method for troubleshooting, following the sequence of overall inspection first and then components.
For fold out houses, special attention should be paid to the integrity of their folding mechanisms, such as hinges and locking devices. You can refer to the testing method in the QB/T 5622 standard for the repeated opening and closing life test of household folding beds to check whether the hinges are loose or deformed, whether the locking device is effective, and whether there are cracks in the connecting parts.
Daily maintenance and regular inspections
Even if no safety hazards are found in the house, regular safety inspections and maintenance are still required. This includes timely repair of roof leaks, wall cracks, regular inspection and maintenance of water and electricity lines, etc., to extend the service life of the house.