Prefabricated Assembly House Renovation

Prefabricated assembly house renovation offers significant advantages in urban renewal, but also faces certain challenges.

Core Advantages

1. Significant Improvement in Construction Efficiency
   Prefabricated assembly technology involves the factory production of components such as walls and floor slabs, which are then directly hoisted and assembled on-site, with 90% of the processes completed in the workshop. For example, the renovation project of the old building at Sanlihe in Beijing achieved precise assembly of 156 prefabricated concrete modules, completing the main structure封顶 in just 46 days and enabling residents to move back in within six months, reducing the construction period by at least one and a half years compared to traditional methods. This “factory production + on-site assembly” model significantly shortens the project cycle, making it particularly suitable for scenarios requiring rapid delivery in urban renewal.

2. Addressing Quality Issues in Old Buildings
   Traditional renovation of old buildings often faces problems such as leakage and poor sound insulation, whereas prefabricated technology achieves precise control through factory production. For example, the window sub-frame and concrete are cast in one piece, and the bathroom is cast as a whole, eliminating leakage caused by aging adhesive layers at the source. Modular design also optimizes sound insulation and thermal insulation performance, enhancing living comfort.

3. Environmental Protection and Resident-Friendliness
   The construction process generates almost no dust or noise pollution and eliminates the need for extensive on-site mixing of cement and mortar, reducing interference with the lives of surrounding residents. This feature is particularly important in densely populated urban areas, helping to lower the risk of complaints related to construction activities.

Industry Status and Challenges

1. Rapid Growth in Market Size
   By 2025, the newly built prefabricated building area nationwide will reach 1.61 billion square meters, with a market size of approximately 1.34 trillion yuan. The market is expected to maintain a growth rate of nearly 10% in 2026. Driven by policies, Guangzhou requires all newly built residential buildings to adopt prefabricated construction starting in 2026, and in Hunan, nearly 70% of newly built structures in the first four months were prefabricated, indicating that the industry is entering a period of rapid development.

2. Cost and Industrial Chain Bottlenecks

• High Costs: The construction and installation costs of prefabricated buildings are 10%-20% higher than those of traditional methods, primarily due to increased expenses in factory production, transportation, and hoisting.
• Imperfect Industrial Chain: Unified standards for modular coordination have not been fully implemented, and some developers only install basic prefabricated floor slabs to meet policy requirements for prefabrication rates, resulting in inconsistent renovation outcomes.
• Technical Adaptability: Old buildings have complex structures, requiring customized modular designs, which demand high levels of technical integration. The industry currently lacks mature experience in this area.

Future Directions

Efforts are needed to reduce costs through technological innovation, improve standard systems, and strengthen industrial chain collaboration. For example, promoting universal modular designs, optimizing transportation and hoisting plans, and enhancing policy guidance to encourage developers to shift from merely meeting prefabrication rate requirements to truly improving building quality.