as-built adjective 1noun 1forms 2 adjective1 •Relating to the form in which something was originally built.It was restored to near as-built condition by EWS ahead of the RAIL/EWS Toton Open Day in August 1998, and was withdrawn from traffic in December 1999, passing to the National Collection. — 2020 noun1 •A drawing showing how a project was actually built as opposed to how it was intended to be built.Maintaining as-builts on the Big Dig was a major undertaking, as it required keeping thousands of utility drawings up to date with the latest changes. — 2013 formsas builts · as-builts