An EOT (extension of time) is a request to move the completion date of a project due to causes that could not be foreseen at the time of contract signing. An extension of time is a provision in construction contracts allowing the project completion date to be adjusted due to legitimate delays.This sample letter of extension of time shows you what your extension of time letter should contain and look like in order to keep and share strong records. When and how a contractor can request a time extension, including how to initiate a claim and what to include in the request documentation. An Extension of Time (EOT) Notice is a formal request that a contractor submits to the project owner and project manager. When an extension of time is refused in a construction project, it can have significant implications for the project schedule, budget, and overall success. When an extension of time is refused in a construction project, it can have significant implications for the project schedule, budget, and overall success. A contractor may be entitled to apply for an extension of time (also known as 'EOT') which will allow them to complete the works within a determined period. Valid Reasons for a Time Extension Request. There are various circumstances which may affect a contractor's ability to complete a job on schedule.