Removal and Heightening of House Prefabricated Slabs

The removal and heightening of house prefabricated slabs must meet four core conditions: safety appraisal, unified property rights, structural safety, and compliance with planning regulations. Moreover, policies strictly prohibit large-scale demolition and construction, requiring classified disposal.

I. Removal Conditions: Centered on Safety Appraisal

Whether prefabricated slabs should be removed does not depend on the age of the building or its structural type, but rather requires a safety appraisal by a professional institution to determine the risk level:

• Grade D dilapidated buildings (overall danger, severe damage to load-bearing structures): Must be demolished and rebuilt;
• Grade C dilapidated buildings (partial danger): Reinforcement, renovation, or reconstruction may be carried out (requiring a comprehensive assessment of costs and risks). If the building does not meet the criteria for dilapidated buildings and the removal of prefabricated slabs is solely for functional needs (such as heightening), additional论证 (demonstration, here it means a detailed analysis and justification) of structural safety and economic rationality is required, and there is no mandatory policy support for this.

II. Heightening Conditions: Meeting Four Stringent Requirements

1. Unified Property Rights and Owner Willingness Heightening must be included in government pilot projects, and owners representing more than 80% of both the exclusive area and the number of owners must agree. If there is significant disagreement among owners, the project may not proceed.

2. Structural Safety Allowance The original building's main structure must meet the load-bearing and seismic requirements after heightening through reinforcement design. For example, if the load-bearing capacity of the original prefabricated slab floor is insufficient, additional beams and columns must be added or the floor must be replaced with a cast-in-place slab; if the foundation settlement is uneven, foundation reinforcement must be carried out. If the reinforcement cost is too high or technically infeasible, demolition and reconstruction are required.

3. Compliance with Urban Renewal Planning Heightening must be coordinated with the surrounding environment and supporting facilities and must not exceed the limit on the proportion of demolished building area in the area (in principle, not exceeding 20% of the current total building area). For example, heightening in old residential areas may involve adjustments to planning such as sunshine spacing and fire lanes, requiring prior communication with the planning department.

4. Policy Compliance According to the 2026 urban renewal policy, large-scale demolition and construction are strictly prohibited, with priority given to original demolition and reconstruction or independent renewal. Heightening must be based on safety appraisal and involve comprehensive decision-making that considers resident willingness, renovation costs, and planning requirements, avoiding blind pursuit of increased floor numbers while neglecting safety and compliance.

III. Core Policy Logic: Classified Disposal and Controllable Risks

The policy emphasizes "classified disposal." For the heightening needs of prefabricated slab buildings, a safety appraisal must serve as the premise, and through owner consultations, structural reinforcement, planning approvals, and other processes, the risks and costs of renovation must be ensured to be controllable and reasonable, ultimately achieving a balance between living safety and urban renewal.