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🏗️ '''Construction defect''' describes a deficiency in the design, materials, workmanship, or site preparation of a building or structure that results in damage, diminished value, or failure to perform as intended — and in the insurance context, it represents one of the most complex and costly categories of [[Definition:Liability insurance | liability]] and [[Definition:Property insurance | property]] claims. Insurers encounter construction defects across multiple lines: [[Definition:Commercial general liability (CGL) | commercial general liability]] policies, [[Definition:Professional liability insurance | professional liability]] (errors and omissions) coverage for architects and engineers, and [[Definition:Builders risk insurance | builders risk]] policies. Disputes over whether a defect constitutes an "occurrence" triggering CGL coverage have produced decades of case law that varies significantly by state.

🔎 Defects typically surface months or years after project completion, creating long-tail [[Definition:Loss development | loss development]] patterns that challenge [[Definition:Reserving | reserving]] and [[Definition:Actuarial analysis | actuarial analysis]]. Water intrusion through improperly sealed building envelopes, foundation cracking from inadequate soil compaction, and the use of defective materials such as faulty plumbing systems — these are recurring scenarios that generate multi-party litigation involving developers, general contractors, subcontractors, and their respective insurers. Allocation of responsibility among overlapping policy periods and multiple carriers adds another layer of complexity, and many jurisdictions apply special statutes of repose that set outer time limits on when construction-defect claims can be filed.

💡 The financial stakes are substantial. In U.S. markets, construction-defect claims regularly produce settlements and verdicts in the millions, and class actions involving large residential developments can reach nine figures. This exposure shapes how [[Definition:Underwriting | underwriters]] evaluate [[Definition:General contractor | contractor]] risks — vetting the quality of subcontractor management, the type of construction, and the geographic jurisdiction all factor heavily into [[Definition:Pricing | pricing]] and [[Definition:Risk selection | risk selection]] decisions. Specialty [[Definition:Managing general agent (MGA) | MGAs]] and surplus-lines [[Definition:Insurance carrier | carriers]] have carved out expertise in this space, offering tailored [[Definition:Wrap-up insurance | wrap-up programs]] and project-specific policies. As [[Definition:Insurtech | insurtech]] firms explore construction-technology partnerships, real-time monitoring and [[Definition:Internet of Things (IoT) | IoT]] sensors hold the promise of detecting defects during construction rather than years after occupancy, potentially shifting the industry from reactive claims management to proactive [[Definition:Loss prevention | loss prevention]].

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Commercial general liability (CGL)]]
* [[Definition:Builders risk insurance]]
* [[Definition:Professional liability insurance]]
* [[Definition:Occurrence (insurance)]]
* [[Definition:Wrap-up insurance]]
* [[Definition:Construction insurance]]
{{Div col end}}

Definition:Construction defect - Revision history

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