Design of Renovation Plan for Prefabricated Houses

The design of renovation plans for prefabricated houses should revolve around the goals of safety, applicability, greenness, and intelligence, integrating structural reinforcement, functional enhancement, and policy requirements, and implementing them step by step in a scientific manner.

I. Identifying Renovation Targets and Assessment Procedures The renovation targets are multi-story prefabricated residential buildings constructed before the end of 2000 (such as those with prefabricated circular hole slabs, channel slabs, and large slab structures), which have been identified by professional institutions as having structural safety hazards or functional defects. The assessment process involves five steps: collecting information on the construction year and structural form; conducting on-site inspections of the building's current condition; performing structural tests (such as concrete strength and component deformation); conducting seismic assessments in accordance with the "Building Seismic Assessment Standards"; and establishing an electronic file for each building ("one file per building") after comprehensive assessment to determine renovation priorities.

II. Implementing Renovation Measures by Category

1. Structural Reinforcement and Functional Enhancement: For buildings that can be repaired, techniques such as adding ring beams and constructional columns, applying carbon fiber sheets, and casting composite layers are used to enhance overall integrity. In conjunction with the renovation of old residential areas, elevators are installed, water and electricity networks are upgraded, and thermal and sound insulation performance is improved. For example, the Neijiang large slab buildings in Shanghai addressed the issue of shared kitchens and bathrooms through a "one-door closure" design and added balconies to enhance living comfort.
2. Demolition and Reconstruction, and Area Renewal: For buildings with damaged main structures that cannot be reinforced, cannot withstand natural disasters, or affect urban planning, measures such as original-site demolition and reconstruction, relocation of dilapidated buildings, or area-wide renovation are taken. For instance, 46 prefabricated slab buildings in the Hubin First to Fourth Residential Areas in Xiamen were demolished, and 470 households in the Zhejiang University of Technology New Village in Hangzhou self-financed the original-site reconstruction.
3. Smart Upgrades and Green Renovations: Introduce technological means to enhance safety and convenience, such as facial recognition access control, smart charging stations, and garbage classification monitoring systems; use local materials and cost-effective techniques to avoid excessive renovation. The renovation of "handshake buildings" in Shenzhen transformed them into loft apartments through structural reinforcement and spatial reorganization, doubling the rent while achieving green and low-carbon goals.

III. Adhering to Policy Principles and Classified Disposal According to the latest policies in 2025, renovations must adhere to the principles of "safety first, classified measures, green and low-carbon, and co-construction and sharing," implementing "one policy per area" and "one policy per building." Buildings that must be demolished include those with damaged main structures that are dilapidated, those that cannot withstand natural disasters, and those that affect urban planning; buildings with intact main structures that are safe for habitation should be renovated through old residential area improvements, avoiding large-scale demolition and construction. The renovation process should fully respect the wishes of residents, with街道办事处 (sub-district offices) and communities organizing residents to jointly decide on plans and supervise the entire process.