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Project Managementaka: fabrication drawingaka: shop drawing submittal

Shop Drawing

In Plain English

A detailed drawing made by a subcontractor showing exactly how they plan to fabricate or install their portion of the work.

Definition

A shop drawing is a detailed fabrication or installation drawing prepared by a subcontractor, manufacturer, or supplier to show how they will manufacture, fabricate, or install a specific portion of the work. Shop drawings are submitted to the architect or engineer for review and approval before fabrication or installation. They do not create additional obligations for the design professional but verify conformance with the design intent.

Why It Matters in Bidding

Shop drawings sit on the submittal critical path, so estimators and project managers must build review and approval cycles into the schedule and account for them in bid logistics. For estimating, the cost of preparing shop drawings, often by the fabricator or sub, is embedded in trade pricing, and slow turnaround on long-lead items like structural steel or curtain wall can delay fabrication, threaten the schedule, and expose the GC to acceleration costs.

Example

After award, the PM logs the structural steel shop drawings as a long-lead submittal and schedules a three-week architect review window so fabrication starts in time to hold the erection date.

Related Terms

SubmittalRFI (Request for Information)Construction AdministrationDocument Control

Related Tools & Templates

Submittal Log

Frequently Asked Questions

Indirectly, yes. The cost to prepare them is built into the subcontractor or fabricator quote, and the review-and-approval duration affects the schedule the estimator must plan around. Long approval cycles on long-lead items can drive sequencing decisions and contingency, even though shop drawings are not a separate bid line.
The subcontractor, fabricator, or supplier prepares them to show how they will fabricate or install their portion of the work, then submits them through the GC to the design professional for review. The architect or engineer reviews for conformance with design intent, not for construction means and methods.
Review duration is set by the contract submittal procedures, commonly a defined number of working days per cycle, plus time for any resubmittals. Estimators and PMs should plan multiple cycles for complex items, since rejections and resubmittals on long-lead fabrication can become the controlling activity on the schedule.

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