Prefabricated Houses Reaching 30 Years

The fact that prefabricated houses reach 30 years does not mean they must be demolished or have reached their end-of-life. Here is a detailed analysis:

1. National standards specify a design service life of 50 years
According to the current national standard, the Unified Standard for Reliability Design of Building Structures (GB50068-2018), the design service life for ordinary buildings and structures is 50 years, and this applies equally to prefabricated panel buildings. The design service life refers to the expected safe usage duration of a building under normal construction conditions, with compliant materials and regular maintenance, rather than a mandatory end-of-life period. In the past, some building codes used a 30-year design reference period, but this was a calculation parameter used by engineers to estimate external loads such as wind, snow, and earthquakes, solely for design purposes on drawings, and unrelated to the actual lifespan of the building. The current standard has uniformly adjusted the design reference period to 50 years, further dispelling misunderstandings.

2. Historical background and misconceptions about the '30-year lifespan'
In the 1970s and 1980s, due to a surge in domestic housing demand, prefabricated panels were widely used in temporary factory buildings and simple ancillary structures because of their fast construction speed and low cost. These buildings once referenced a 30-year inspection cycle, but through word-of-mouth and selective reporting on short-video platforms, this gradually became misconstrued as a lifespan limit for ordinary residential buildings. In reality, there are fundamental differences in structural safety standards between prefabricated panel buildings and simple structures, and they cannot be simply compared.

3. Building safety requires professional assessment and is unrelated to age
Determining whether a building is safe requires a structural safety assessment by a professional institution in accordance with the Standard for Dangerous Building Appraisal (JGJ125-2016), with results classified into four grades: A, B, C, and D. Only Grade C (partially dangerous buildings) and Grade D (entirely dangerous buildings) are considered dangerous and require reinforcement or demolition measures, while the assessment results are not directly related to the building's age. For example, some well-maintained prefabricated panel buildings have been in use for three to four decades and can continue to be used safely for decades more if their main structures are sound.

4. Urban renewal targets dangerous buildings, not all prefabricated panel buildings
The core of current urban renewal policies is to eliminate safety hazards, focusing on the demolition or renovation of buildings already appraised as Grade C or D dangerous buildings, rather than all prefabricated panel buildings. For structurally safe prefabricated panel buildings, the government will extend their service life through repairs and reinforcements to avoid resource waste.