Why were traditional Chinese buildings designed for parts to be replaced over time?

Traditional Chinese buildings were designed for parts to be replaced over time primarily because they were constructed chiefly of timber, a material highly vulnerable to fire, moisture, insects, and the natural passage of time.1

Because the structural system was modular and highly standardized, buildings were engineered to persist through the repeated replacement of individual components. This approach allowed a single structure to have an original construction date while simultaneously incorporating elements from many different historical periods. By utilizing a system of measurement that ensured consistent proportions as parts were expanded or replaced, the architecture maintained its structural integrity and aesthetic harmony over centuries. This modularity was so deeply integrated into the design that it facilitated a slow, nearly invisible evolution of the building style, allowing traditional architecture to endure with little need for radical redefinition.1