What Are As-Built Drawings in Construction?

As-built drawings record the building work as it was constructed, including relevant changes from the original design. They are part of the record the owner needs for maintenance, future alteration and safe investigation of concealed systems.

What should the drawings capture?

The project specification should identify required disciplines, formats and level of detail. Record relevant changes to layouts, equipment, services routes, penetrations and interfaces. Use drawing numbers, revision dates and a clear “as-built” or “as-constructed” status. Supporting surveys and commissioning records may be needed to verify hidden work.

Who creates and checks them?

The responsibilities depend on the contract. Site teams commonly record changes as work proceeds; the appointed party incorporates them into final drawings and the reviewer checks against available records. Waiting until practical completion to reconstruct months of changes from memory is a weak process.

Are they a substitute for investigation?

No. Record drawings are only as reliable as the information captured and verified. Before cutting into an existing building, confirm critical conditions on site and follow the applicable safety and approval procedures. Distinguish existing-condition survey drawings from records produced at the end of a new project.

For hidden services, require a capture point before ceilings or walls close where the contract calls for it. A photograph with location and date, site mark-up and later checked drawing can form a much stronger record than a neat drawing assembled only from the original design.

Agree the deliverable early and include it in the handover register. Team Vanguard’s documentation support can help coordinate the final set.

Sources and further reading

• National Dictionary of Building and Plumbing Terms — as-built drawing
• Western Australian Department of Finance — commissioning and handover guideline