Which option best describes a collateral warranty in construction?

• A. Insurance policy to cover excavation
• B. Payment terms agreement
• C. A legal framework for warranty period extension
• D. A legal agreement providing third parties the right to claim for defects

Answer: (D)

A collateral warranty is a contractual promise that creates rights for someone who isn’t a party to the main construction contract. It ties the designer, contractor, or subcontractor to the benefit of a third party—such as a future owner, occupier, or lender—so that that third party can claim for defects in the completed project if things go wrong. This means the third party can sue the professionals or builders for design or workmanship problems, even though they weren’t part of the original contract. It sits alongside the main contract and extends the warranty beyond the direct client to those with a stake in the project, ensuring protection and remedies for defects within a defined warranty period.

So the right description is a legal agreement providing third parties the right to claim for defects. This isn’t about an insurance policy, payment terms, or simply extending the warranty period; those functions are different from the protective, third-party claim rights that a collateral warranty establishes.