Why are buildings under construction or renovation more susceptible to fire spread?

Buildings under construction or renovation often pose a heightened risk for fire spread primarily due to the absence of operational fire protection systems, such as sprinklers and fire department connections (FDC). When these systems are not yet fully installed or operational, there is no automatic mechanism to suppress potential fires, allowing them to grow unchecked and spread more easily throughout the structure.

Additionally, the environment of construction or renovation frequently includes various types of flammable materials, debris, and equipment that can contribute to fire hazards. Without the safeguards that functioning sprinkler systems provide, fires can escalate quickly, resulting in rapid fire spread and greater risk to firefighters and emergency responders.

The presence of incomplete electrical systems also contributes to the risk; however, the primary factor in this scenario is the lack of effective fire protection measures. This makes option related to operational sprinklers the most fitting explanation for the increased susceptibility to fire spread in such environments.