As-built drawings (or as-builts) are revised architectural and engineering plans that document how a building or infrastructure was actually constructed, reflecting any changes made during construction from the original approved plans. Construction often involves adjustments due to site conditions, material availability, or practical considerations discovered during building. As-builts provide an accurate record for future maintenance, renovations, or repairs, showing where utilities are actually located rather than where they were planned. Municipalities require as-built drawings for infrastructure like water mains and sewers so crews know exactly where pipes are when doing future work.