Compared with new structures, old or abandoned buildings pose what level of risk during a fire?

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Old or abandoned buildings pose an even greater risk in a fire because their structural components are often degraded and their interior conditions are unknown. Deterioration, hidden fire loads, and a lack of maintenance can weaken floors, walls, and the roof, making sudden collapse more likely and reducing the predictability of what you’ll encounter inside. Modern structures are designed and built with fire-resistant systems, known materials, and clearer load paths, which tend to keep conditions more stable during a fire. In abandoned buildings, unknown modifications, removed supports, and concealed voids can let fire spread and conceal structural failures until it’s too late. This combination creates higher danger for firefighters and the potential for rapid, uncontrolled fire progression compared with newer construction, so the risk is greater.