Relating to the form in which something was actually constructed, especially as opposed to what was planned; (Building) designating a plan, survey, etc., made after the completion of works.
Origin
1930s; earliest use found in Railway Age.
Definition of as-built in US English:
as-built
adjective
Relating to the form in which something was actually constructed, especially as opposed to what was planned; (Building) designating a plan, survey, etc., made after the completion of works.