As-Built Drawings: Revised construction drawings that document a building or structure as it was actually built, incorporating all changes made during construction from the original permitted plans, and serving as the permanent record of the built condition.
Why As-Builts Matter
Construction rarely proceeds exactly as designed. Utilities get relocated to avoid obstructions, dimensions change to accommodate field conditions, and equipment is substituted. As-built drawings capture these changes, creating an accurate record of what's actually behind the walls. For building owners, as-builts are essential for future renovations, repairs, and troubleshooting — knowing where pipes and wires actually run saves time and money.
When As-Builts Are Required
As-built drawings are required by many building departments as a condition of permit finalization for commercial projects, complex residential projects, and underground utilities. Some jurisdictions require as-builts for all permitted work over a certain value. For private residential projects without a specific requirement, as-builts are still best practice, especially for complex renovations.
Who Prepares As-Builts
On commercial projects, the general contractor typically maintains a set of "redlined" construction drawings throughout the project, marking changes as they're made. These are then formalized into as-built drawings by the architect or engineer of record. On residential projects, the contractor or homeowner typically maintains the record. Some cities require as-builts to be prepared and stamped by a licensed professional.
As-Builts and Real Estate
As-built drawings are valuable at the time of property sale, especially for commercial properties. Buyers of buildings with complex mechanical systems or significant renovation history often request as-builts as part of due diligence. Missing as-builts are a gap that can slow or complicate commercial real estate transactions.