Extreme heatwaves pose a serious threat not only to human health but also to the integrity of urban buildings. Following recent incidents where glass facade elements fell in Germany and Poland, experts are warning about the strong impact of high temperatures on key construction materials. Heat can cause cracks, deformations, and the failure of individual elements composed of concrete, glass, asphalt, steel, aluminum, and various adhesives and sealants. Although heat itself is usually not the primary cause of damage, it can reveal hidden defects in existing structures. It is crucial to recognize warning signs on buildings and identify construction work that should be postponed during periods of extreme temperatures. Preventing poor-quality workmanship is essential for the safety and durability of all types of modern construction structures.