Steel shop drawings are priced in one of a few ways: folded into the fabrication price, per tonne of steel, per sheet, by the hour, or as a lump sum for the package. What drives the number is not the weight of steel but the number of distinct pieces, connections and revisions the detailer has to draw. A single basement beam may need one sheet; a stair with landings and railings can need several, even though it weighs a fraction as much.
This guide explains how shop drawing quotes are put together, what moves the cost, and what to send so you get an accurate quotation the first time. For tonnage-based pricing on larger structural packages, see steel detailing cost per tonne.
What you are paying for
Shop drawings translate the engineer's and architect's design into drawings a shop can build from and a crew can install from. A typical package includes:
- Erection drawings (plans and elevations) showing where every piece goes by its piece mark.
- Piece or fabrication drawings for each beam, column, post or assembly, with every cut, hole, plate and weld dimensioned.
- Connection details, either taken from the design drawings or designed by the fabricator's engineer where the contract delegates connection design.
- Material lists and bolt lists.
- Submission and revision through the review cycle with the engineer of record.
The difference between the two drawing types is covered in shop drawings vs fabrication drawings. Whether the drawings need an engineer's seal is a separate question; see do shop drawings need an engineer's stamp in Ontario.
How shop drawings are priced
| Method | How it works | Where you see it |
|---|---|---|
| Included in fabrication | The fabricator details what it makes and carries the cost in its fabrication price | Most fabricator-supplied jobs, from single beams to buildings |
| Per tonne | A rate applied to the estimated steel weight | Larger structural packages with repetitive framing |
| Per sheet | A rate per drawing sheet, sometimes by sheet type | Independent detailers, small or well-defined jobs |
| Hourly | Time spent, often with an estimate or cap | Revisions, small changes, as-built work |
| Lump sum | One price for a defined package and number of review cycles | Miscellaneous steel, stairs, railings, renovation jobs |
Each method has a blind spot. Per tonne undercharges intricate light steel and overcharges heavy, simple steel. Per sheet depends on how much the detailer puts on a sheet. Hourly is fair but open-ended. Lump sum is clear, but only for the scope and revision count it names.
When you hire a fabricator to make the steel, the detailing is usually done by the same company or its detailer, and you see it as part of one price. When you hire a detailer directly, for example to get drawings priced by several fabricators, you pay for the drawings separately.
What drives the cost
Number of distinct pieces. Every unique piece mark gets its own drawing or detail. Ten identical beams are drawn once; ten beams that differ slightly are drawn ten times. Repetition is the single biggest saving.
Connections. Simple bearing connections and standard shear tabs are quick. Moment connections, skewed or sloped framing, and connections to existing structure take more time, and more again if the fabricator has to design them.
Miscellaneous steel. Stairs, railings, ladders, gates and canopies carry far more drawing time per kilogram than framing. They have many small parts, and their dimensions depend on finished floor heights, wall locations and code clearances.
Existing conditions. Renovation work, such as a beam into an old house or a lintel in an existing wall, often needs site dimensions before drawings can be finished. Someone has to measure, and the drawings have to allow for out-of-square and out-of-level reality.
Quality of the design drawings. Incomplete or conflicting drawings produce RFIs (requests for information) and waiting time. A detailer who has to chase missing dimensions spends more hours, and those hours show up in the price or the schedule.
Review cycles and revisions. Most quotes include a set number of submissions. Design changes after drawings are approved are usually extra, and they are the most common reason a shop drawing cost grows.
Format and deliverables. A 3D model, specific software formats, numerical-control files, or detailed as-builts at the end can all add cost if they are beyond the standard package.
Schedule. A rush job may need more people drawing in parallel, and detailing while the design is still moving produces revisions.
Small jobs: beams, posts and lintels
Homeowners and renovation contractors often ask what a shop drawing costs for a single beam, post or lintel. In practice, on a job like that:
- The engineer's design sets the beam size, bearing, posts and connections.
- The fabricator prepares a piece drawing for each item, often on one or two sheets.
- The drawing is usually priced as part of the fabricated steel rather than as a separate line.
What makes even a small job take longer is missing information: no confirmed length, no bearing details, no post height, or an engineer's sketch that leaves the connection to "fabricator to design". Send the stamped design and site dimensions and a small job stays small. Our guide on how to request a steel beam quote lists what to include.
How much to charge for shop drawings (for detailers)
If you are a detailer pricing a job rather than buying one, the same drivers apply. Most detailers build a price from:
- A piece and connection count from the design drawings, by type.
- Sheet count, estimated from that count and the firm's drawing standards.
- An allowance for RFIs and coordination, based on how complete the drawings are.
- The number of review cycles included, with a stated rate for revisions beyond that.
- Exclusions: connection design, engineering seals, field measuring, as-builts, and changes after approval.
The clearer the quote is about what's included, the fewer arguments later. A low number that assumes one clean review cycle on an incomplete design will not stay low.
How to compare shop drawing quotations
When you have more than one price, check that they cover the same work:
- Does the price include connection design, or are connections to be shown on the design drawings?
- How many review cycles are included, and what does a revision cost?
- Are miscellaneous items (lintels, loose angles, stairs, railings) included or excluded?
- Is field measuring included where existing conditions apply?
- What is the turnaround for first submission and for resubmissions?
- Are the drawings tied to a fabrication contract, or are they a standalone deliverable you own?
A quote that bundles drawings with fabrication from the same shop removes one handoff. The people drawing the steel are the people building it, so questions about holes, plates and welds are settled internally rather than by email between two companies.
Getting shop drawings and fabrication priced together
We prepare shop drawings in-house for the steel we fabricate, and engineering services are available for projects that need them. Take-offs and quotes are free: send your structural or architectural drawings and we'll price the job, then produce the shop drawings once the quote is approved. Request a quote and see our services for fabrication, CWB certified welding, delivery and installation.
Frequently asked questions
Are shop drawings included in the price of fabricated steel?
Often, yes. When a fabricator details the steel it is going to make, the drawings are usually part of the fabrication price. Ask the fabricator to confirm in the quote, and check whether revisions are included.
How are shop drawings priced?
Common methods are bundled into fabrication, per tonne of steel, per sheet, hourly, or a lump sum for the package. Small and miscellaneous jobs are usually priced by the package; larger structural jobs are often priced by tonnage.
Why do stair and railing drawings cost more than beam drawings?
Because drawing time follows the number of distinct pieces and connections, not the weight. A stair or railing has many small parts and dimensions that must suit the site, while a simple beam is one piece with a few holes and plates.
Do I need shop drawings for a single basement beam?
The fabricator still needs a piece drawing to build it, and your engineer or building department may want to see it. For a simple beam and posts it can be a single sheet. Ask what your permit and engineer require.
