Category: Contracts & management
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
A warranty is a commitment by the contractor, supplier or manufacturer to repair defects or replace materials for a set period, such as a multi-year waterproofing warranty or a manufacturer's equipment warranty. Applicable law may also hold the contractor and engineer liable for serious defects after handover; the contract and legal advice govern the details.
Why it matters on a project
A written warranty with clear terms protects the owner after handover. A verbal or undefined warranty is worthless in a dispute.
Common mistake
Accepting warranty certificates in the contractor's name only without transferring them to the owner, or without stating what is covered and excluded.
Frequently asked questions
How does a warranty differ from the defects period?
In the defects period the contractor fixes defects after handover; warranties can run longer for specific materials or systems.
Is a warranty void after misuse?
Usually yes, which is why the terms state what is covered and excluded.
Related terms
- Defects liability periodThe period after handover during which the contractor must repair defects at its own cost.
- Handover certificateA document evidencing the client’s acceptance of the works and start of the defects period.
- WaterproofingLayers preventing water ingress into structural elements or spaces, such as bituminous membranes and cementitious coatings.
- Final accountThe final financial settlement of the contract value after completion.
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