Hangzhou Prefabricated Slab Structure Housing

Under the 2024 Zhejiang Provincial policy, Hangzhou's prefabricated slab structure housing is mostly included in the scope of complete demolition and reconstruction or renovation, with specific decisions based on housing quality, age, planning conditions, and homeowner willingness.

Policy Background and Renovation Priorities

In 2024, Zhejiang Province explicitly included prefabricated slab houses in the scope of complete demolition and reconstruction, with brick-and-mortar and prefabricated slab structure buildings constructed in 2000 or earlier being the focus of renovation. Due to their long construction age, these houses suffer from severe structural aging, making them a major area of dilapidated housing. The policy prioritizes addressing safety hazards through demolition and reconstruction or reinforcement measures. For example, the prefabricated slab houses in typical old communities such as Jingfang and Chaohui urgently require renovation due to their prime urban locations and large scale.

Housing Characteristics and Existing Issues

Prefabricated slab houses are assembled from cement components and have a design lifespan of only 30-40 years. They are prone to issues such as wall cracks, leakage, and poor sound insulation, and are even susceptible to collapse during earthquakes, floods, and other disasters. Most of Hangzhou's existing prefabricated slab communities are “old, dilapidated, and small,” such as Cuiyuan and Caihe. Although they have advantageous locations, they offer poor living experiences and insufficient supporting facilities, making it difficult to meet modern living needs.

Renovation Models and Applicable Conditions

1. Comprehensive Renovation: Suitable for neighborhoods with acceptable quality, focusing on improving infrastructure and public environments, but unable to address structural safety issues.
2. Dilapidated Housing Treatment: Targets housing with safety hazards, addressing structural issues through reinforcement or “three-no” reconstruction (no exceeding area, use, or height), but with limited improvement in living standards.
3. Expropriation and Renovation: Efficient but costly, generally not used for in-situ renovation.
4. Resident-Initiated Renovation: A pilot model in Hangzhou that requires 100% consent from all homeowners, who bear the renovation costs, with government support through policies such as increasing floor area ratios. For example, Chaohui Zhejiang University of Technology New Village became the province's first self-renewal model, and Shaoxing Changcheng Jiaoyuan Community has also initiated renovation.

Renovation Standards and Implementation Conditions

1. Dilapidated Housing Certification: Requires a report from a Class A institution, identifying the house as Grade C (partially dilapidated) or Grade D (entirely dilapidated), with reinforcement costs exceeding 50% of new construction costs.
2. Age Requirement: Priority is given to houses built in 2000 or earlier.
3. Planning Compliance: The community must not occupy urban red lines, cultural heritage sites, or areas planned for recent demolition.
4. Homeowner Consent Rate: Consent from over 90% of homeowners in the same building is required, with some cities demanding 100%.