AsBuilt

Asbuilt, or as-built, refers to documentation that reflects the final, constructed condition of a project. It records how a structure, system, or component was actually built, including deviations from the original design such as dimensions, locations, materials, and assemblies. As-built information is typically captured on drawings, specifications, and digital models that represent the true installed condition.

Common forms of as-built documentation include as-built drawings (record drawings), redline drawings, as-constructed surveys, and digital representations such as as-built BIM models. During construction, field crews and subcontractors annotate drawings to capture changes, which are later reconciled by designers and contractors to form the official as-built package.

The content of as-built documentation generally encompasses updated architectural, structural, and mechanical, electrical, and plumbing layouts; revised dimensions and coordinates; locations of equipment, valves, and penetrations; material substitutions; and notes on field changes or deviations from the original plan. In digital workflows, an as-built BIM model may include geo-referenced data and lifecycle information for facilities management.

Purpose and uses include facilitating future maintenance, renovations, and expansions; supporting operation and maintenance manuals; aiding safety and regulatory compliance; and providing asset management information for owners and facilities managers. As-built records are often required as part of project closeout or permitting processes and serve as a historical record for the built environment.

Limitations exist because accuracy depends on thorough record-keeping and subsequent updates. Conditions may change after completion, making the as-built documentation outdated if not maintained.