Shop drawings serve as the bridge between design and construction. Get them right, and the fabrication and installation processes will proceed smoothly. Get them wrong—or delay them—and you may end up with steel that doesn’t fit, millwork that blocks electrical outlets, or ductwork that runs straight into a structural beam. This guide explains what shop drawings entail, who prepares and approves them, and how they differ from fabrication and construction drawings.
What Do Shop Drawings Show?
Design drawings show intent. Shop drawings show how that intent will actually be built with a specific product, by a specific fabricator. A typical shop drawing includes:
- Exact dimensions of every piece, field-verified where the specs require it
- Materials and products, including grades, gauges, finishes and manufacturer model numbers
- Connections and joints: welds, bolts, anchors, fasteners and how pieces join
- Fabrication details: cuts, holes, bends, reinforcement and tolerances
- Installation details: attachment to the structure, embeds, supports and sequence
- Interfaces with other trades, such as openings for MEP penetrations or blocking for wall-mounted items
- Piece marks and quantities that tie each item to the field layout
Shop drawings are usually submitted along with product data (manufacturer cut sheets) and samples. Together, these make up the submittals described in the project specifications, normally in Division 01, Section 01 33 00, Submittal Procedures.
Who Prepares and Approves Shop Drawings?
| Step | Who | What happens |
|---|---|---|
| 1. Prepare | Subcontractor, fabricator or supplier | Develops the shop drawings from the contract drawings and specs, often with field measurements |
| 2. Review and coordinate | General contractor | Checks for completeness, dimensions and conflicts with other trades, then stamps and forwards |
| 3. Review for design intent | Architect and engineer of record | Confirms the submittal conforms to the design and returns it with an action stamp |
| 4. Revise if needed | Subcontractor | Makes corrections and resubmits until accepted |
| 5. Fabricate and install | Subcontractor | Works only from the reviewed drawings |
Common Review Stamps
Review actions vary by firm, but most use some version of these:
- No exceptions taken (or “Reviewed”): proceed with fabrication.
- Make corrections noted (or “Approved as noted”): proceed, incorporating the reviewer’s comments.
- Revise and resubmit: make the changes and send the drawings back for another review before fabricating.
- Rejected: the submittal does not meet the design or specs and needs to be redone.
A design team’s review does not shift responsibility for dimensions, quantities or means and methods away from the contractor. Under standard contracts such as AIA A201, shop drawings are not contract documents. They show how the contractor proposes to meet the contract documents.
Shop Drawings vs. Other Construction Drawings
These terms get mixed up constantly, even on job sites. Here is how they differ:
| Drawing type | Prepared by | Purpose | Used for |
|---|---|---|---|
| Construction (design) drawings | Architect and engineers | Show design intent: what is to be built | Bidding, permits, contract |
| Shop drawings | Subcontractor, fabricator or supplier | Show how a specific component will be fabricated and installed | Submittal review, then fabrication and installation |
| Fabrication (detail) drawings | Fabricator’s detailer | Show each individual piece for the shop floor: cuts, holes, welds | Making the parts |
| Coordination drawings | Trades, led by the GC or MEP coordinator | Show multiple trades together to resolve conflicts | Clash resolution before installation |
| As-built drawings | Contractor | Record what was actually installed | Closeout and facility management |
Shop Drawings vs. Fabrication Drawings
The two terms are often used interchangeably, but on steel and precast work they mean different things. Shop drawings (or erection drawings) show assemblies and how they fit together on site; they go to the design team for review. Fabrication drawings (or piece drawings) break each assembly into individual parts with every cut, hole and weld, and they stay inside the fabrication shop. Fabrication drawings are produced from the reviewed shop drawings, not the other way around.
Shop Drawing Examples by Trade
| Trade | What the shop drawings show |
|---|---|
| Structural steel | Erection plans, member sizes, connections and piece marks, prepared to AISC practices |
| Rebar | Placing drawings and bar bending schedules with bar marks, sizes, shapes and locations |
| Precast concrete | Panel layouts, dimensions, reinforcement, embeds, lifting inserts and connections |
| Millwork and casework | Elevations, sections, materials, hardware, and blocking or utility locations |
| HVAC ductwork | Duct sizes, routing and elevations, fittings, dampers and hangers, built to SMACNA standards |
| Plumbing and piping | Pipe routing, sizes, slopes, valves, supports and equipment connections |
| Fire sprinklers | Working plans with head layout, pipe sizes and hydraulic calculations per NFPA 13 |
| Curtain wall and storefront | Frame profiles, anchors, glazing, sealant joints and expansion details |
| Wood trusses | Truss profiles, member sizes, connector plates and bracing requirements |
Each trade has its own conventions. Our guides to MEP shop drawings, millwork shop drawings and rebar shop drawings go deeper into each one.
Why Shop Drawings Matter
Shop drawings are where design intent meets real products and field conditions. Done well, they:
- Catch conflicts before fabrication, when a fix is a redline instead of a torch.
- Confirm dimensions, connections and field measurements so parts fit the first time.
- Coordinate trades, such as the sleeves and embeds that ductwork, piping and steel all depend on.
- Let the design team check that products and details meet the specifications.
- Cut waste, rework and schedule delays on site.
- Create a record of what was approved, which feeds the as-built drawings at closeout.
How Long Do Shop Drawing Reviews Take?
Project specifications usually set the review period. 10 to 15 working days per review cycle is common, and complex or structural submittals can take longer. Every “revise and resubmit” restarts the clock. On a fast-track job, a steel or curtain wall package that needs two resubmittals can push fabrication back by six weeks or more, so the submittal schedule needs to be built backward from the fabrication and delivery dates.
Why Shop Drawings Get Rejected
- Deviations from the specs without a substitution request.
- Missing information: no dimensions, no connection details, no material grades.
- Not field-verified where the specs require site measurements.
- Conflicts with other trades that the GC review should have caught.
- Wrong revision of the contract drawings used as the base.
- Incomplete packages: shop drawings without the product data or calculations the spec calls for.
Most of these come down to the same root cause: shop drawings started too late and rushed. A complete, well-coordinated first submission is the fastest way to fabrication.
Shop Drawing Services for Contractors
Design Estimation prepares shop drawings for subcontractors and general contractors across the US, including MEP, millwork, rebar, steel and precast, coordinated with the architectural and structural sets and formatted for fast review. See our shop drawing services, or send your drawings for a quote.
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Frequently Asked Questions
Quick answers to the questions contractors ask us most.
What are shop drawings in construction?
Shop drawings are detailed drawings that show how a specific building component will be fabricated and installed. Subcontractors, fabricators or suppliers prepare them from the design drawings, and the design team reviews them before fabrication.
Who prepares shop drawings?
The subcontractor, fabricator or supplier responsible for the work prepares them. Many trades use in-house detailers or outsource to drafting firms. The general contractor reviews and forwards them to the architect and engineer.
Who approves shop drawings?
The architect and engineer of record review shop drawings for conformance with the design. The general contractor reviews them first for coordination and completeness. The contractor stays responsible for dimensions and quantities.
What is the difference between shop drawings and construction drawings?
Construction drawings show what to build; shop drawings show exactly how one component will be built. Construction drawings come from the design team. Shop drawings come from the trade doing the work.
What is the difference between shop drawings and fabrication drawings?
Shop drawings show assemblies for review; fabrication drawings show individual pieces for the shop floor. On steel and precast jobs, fabrication drawings are produced from the reviewed shop drawings.
Are shop drawings contract documents?
No. Under standard contracts such as AIA A201, shop drawings are not contract documents. They show how the contractor proposes to meet the contract documents, which still govern.
What does "make corrections noted" mean on a shop drawing?
It means you can proceed with fabrication as long as you include the reviewer’s comments. A “revise and resubmit” stamp, by contrast, means the drawings must be corrected and reviewed again before fabrication.
What is the meaning of shop drawings?
Shop drawings are detailed drawings prepared by a contractor, fabricator or supplier to show exactly how a component will be made and installed. They are sometimes called workshop drawings or fabrication drawings, and the architect or engineer reviews and approves them before fabrication.
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