Shop Drawings
Detailed drawings prepared by a subcontractor, supplier, or fabricator showing exactly how they intend to build or install their specific piece of the project, the fabrication-level detail that goes well beyond what the architect's original drawings show.
Why it matters
An architect's drawings show design intent; they don't show every bolt, weld, and connection a fabricator actually needs to build something. Shop drawings are the translation from "here's what it should look like" to "here's exactly how we're going to build it," and someone on the design team has to catch mistakes here before fabrication starts.
On a real project
A structural steel fabricator produces shop drawings showing the exact size, length, and connection details for every beam and column on a project, far more specific than the architect's original structural drawings, for the structural engineer to review before any steel gets cut.
Who this matters most to
An Ironworker works directly from approved shop drawings on-site, since they show the exact connection details the original design drawings never specified. A Project Engineer tracks the shop drawing review as part of the broader submittal process, chasing down approvals before fabrication can start.
Where this goes wrong
A fabricator starts cutting steel from their own shop drawings before the structural engineer actually approves them, trying to save time. The engineer's review catches an error in a connection detail after the pieces are already fabricated, and the fabricator has to eat the cost of correcting steel that was built to unapproved drawings.
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