Comprehensive and Detailed Explanation From Exact Extract (CSI-based)

According to CSI’s Project Delivery Practice Guide and CDT body of knowledge, the Contractor is typically required—by the conditions of the Contract—to maintain record drawings during construction. These are sometimes called “as-built” or “marked-up” drawings.

CSI explains that:

The Contractor must keep on site a current set of drawings and, as the work progresses, mark changes, deviations, and concealed conditions that differ from the original contract drawings.

This responsibility is usually stated in the General Conditions and/or Division 01, and is part of the contractor’s obligation to provide Project Record Documents at closeout.

At the end of the project, these contractor-maintained record drawings and related record information are typically delivered to the Architect/Engineer and then to the Owner as part of closeout, but the party maintaining them during the project itself is the Contractor.

The Architect uses the contractor’s record information to prepare formal record documents only if required by the contract, but the day-to-day updating and maintenance during construction is assigned to the Contractor in standard CSI-aligned practice.

Relevant CSI concepts (paraphrased):

CSI Project Delivery Practice Guide – sections on “Construction Phase” and “Project Record Documents” explaining that the contractor keeps a set of marked-up record drawings during the work.

CSI CDT Study Materials – topic on roles and responsibilities for record documents and closeout.