CECR (Completed Risks Insurance) protects civil engineering structures post-construction against unforeseen physical damage, predominantly from natural hazards rather than fire. This insurance is crucial for various infrastructures like bridges, dams, and pipelines, and is offered on either an 'all risk' or 'named perils' basis with coverage renewed annually. Effective underwriting considers factors like risk type, geographical location, and maintenance history to establish terms and conditions for insurance coverage.