What is an as-built drawing?
An as-built drawing is the record set of what was actually constructed, revised to match field conditions rather than the original design intent. During construction, routing shifts, equipment is substituted, dimensions move — the as-built captures those changes on the drawings so the owner, the next design team, and the maintenance staff are working from the building as it exists. Many jurisdictions and owners require as-builts as a condition of final acceptance or project closeout.
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As-builts vs the permit set vs record drawings
The permit set is what was approved. The construction set is what the contractor was told to build, including approved revisions. The as-built set is what stands in the field at the end. The terms record drawings and as-builts are often used interchangeably; where a distinction is drawn, record drawings are compiled by the design team from the contractor's marked-up field set, while as-builts in the strict sense are verified against the field. What matters for closeout is which standard your contract and your jurisdiction require — a compiled record from redlines, or a field-verified survey of installed conditions — because the effort and the price differ.
How as-builts are produced
The raw material is the contractor's redline set: the field markups recorded as changes happen — a duct rerouted around a beam, a panel relocated, a pipe size changed by an approved substitution. The design team transfers those markups into the drawing files, flags anything that changed the engineering (a longer duct run, a different equipment model, a moved fixture), and confirms the revision does not reopen a compliance question. The failure mode is the redline set reconstructed from memory at the end of the job: it looks complete and quietly is not. Good projects keep the redlines current weekly, when the changes are still visible and the people who made them are still on site.
Why owners ask for them
The first renovation, tenant improvement, or repair on a building starts from its drawings. When those drawings describe a building that was never built, the next team pays to rediscover conditions — opening ceilings to find the duct that is not where the plan says, tracing circuits the panel schedule mislabels. As-builts are cheap at closeout, when the information exists, and expensive forever after. They also matter for operations: maintenance staff isolating a system, planning a shutdown, or locating a valve work from these documents. For owners holding a building long-term, an accurate record set is an asset with a measurable return.
When changes need engineering, not just drafting
Most field changes are documentation. Some are design: a substituted air handler with different electrical characteristics, a rerouted grease duct, a relocated shear wall opening. Those changes need the engineer of record to accept them — by review of the substitution, a revision, or a letter — because the sealed design is what the permit rests on. Torch handles as-built and record-set work for the projects it engineers, reviewing field changes as they are submitted rather than at closeout, so the final set is both accurate and still the engineer's document.
The bottom line
As-builts record the building as constructed, compiled from field redlines kept current during the work. Owners require them because every future project on the building starts from those drawings.
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