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🏗️ '''Inherent defects insurance (IDI)''' is a [[Definition:Construction insurance | construction-sector insurance]] product that covers the cost of repairing structural defects in a building that originate from errors in design, materials, or workmanship and that manifest after the project has been completed and handed over. Often referred to as "latent defects insurance" or "structural defects insurance" in various markets, IDI provides building owners, purchasers, and financiers with a safety net that endures well beyond the typical contractual limitation periods within which claims against contractors and designers can be pursued. Policy terms commonly run for ten to twelve years from practical completion, aligning with statutory [[Definition:Decennial liability | decennial liability]] regimes in civil-law jurisdictions such as France, Belgium, and several Middle Eastern countries — where a form of this cover is frequently compulsory.

🔍 Coverage is typically triggered when a defect impairs the structural integrity or stability of the building, affects its weather-tightness, or poses a safety hazard to occupants. Before the insurer commits to the risk, an independent [[Definition:Technical auditor | technical auditor]] or monitoring surveyor is appointed to review the design, inspect construction, and verify compliance with specifications throughout the build phase — a process that simultaneously reduces risk and generates valuable data for [[Definition:Underwriting | underwriting]] decisions. This proactive monitoring distinguishes IDI from reactive liability policies: the insurer is paying to prevent claims as well as to indemnify them. The policy is non-cancellable once issued and runs with the building rather than the original developer, meaning it transfers automatically to subsequent owners — a feature that makes it particularly attractive to institutional investors, real-estate funds, and mortgage lenders.

🏛️ IDI has gained steady traction across global property markets because it addresses a well-recognized gap: the difficulty of pursuing contractors or designers years after project completion, especially when firms have dissolved, gone insolvent, or left the jurisdiction. In the United Kingdom, IDI emerged as a market-led solution partly because English law does not impose a decennial liability obligation, leaving building owners reliant on contractual or tortious claims that can be difficult to enforce after long intervals. In France and other civil-code markets, the [[Definition:Assurance décennale | assurance décennale]] framework makes a comparable form of cover a legal requirement for builders. Lenders increasingly mandate IDI as a condition of project finance, and the product's role is expanding alongside new construction methods — such as modular and off-site manufacturing — where defect patterns differ from traditional building and require updated risk assessment. For [[Definition:Insurance carrier | insurers]], the long-tail nature of IDI demands careful [[Definition:Reserving | reserving]] and a deep understanding of construction technology trends.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Construction insurance]]
* [[Definition:Professional indemnity insurance]]
* [[Definition:Decennial liability]]
* [[Definition:Warranty and indemnity insurance]]
* [[Definition:Latent defect]]
* [[Definition:Contractor's all-risk (CAR) insurance]]
{{Div col end}}

Definition:Inherent defects insurance (IDI) - Revision history

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