Key takeaway: An accurate metal fabrication quote depends on a complete package: dimensioned drawings, quantities and annual volume, grade and material certificate, general tolerance, finish, required date and delivery location. Every missing piece of information becomes an assumption by the estimator, and every assumption shifts the price or the lead time.
Three responses came back for the same metal fabrication quote request, a stainless steel bracket, and no price looks like the other two. Reading them line by line, the buyer understands: the first shop priced 304, the second priced 316L with a certificate, and the third left out the polishing.
None of the three got it wrong. Each one filled the gaps in the request in its own way. The price you receive is only as good as the package you send, and that package is prepared before contacting the first supplier.
A complete package produces comparable quotes
In brief: seven pieces of information are enough for two shops to price exactly the same part.
An estimator receives a specification and must commit to a price and a schedule. Gerald Davis sums it up in his series on job shop estimating, published by The Fabricator: the drawing notes specify the material, finish and dimensions, and the request specifies the target quantity and delivery schedule. Whatever is missing, the estimator has to guess.
The package comes down to seven items:
- Dimensioned drawings. A PDF for reading, plus the 3D or 2D file used to produce it. The file formats exchanged with the shop depend on the software, but the PDF and the file must carry the same revision level.
- Quantities. The order quantity, the prototype quantity if there is one, and the expected annual volume.
- Grade and thickness. "Stainless" is not enough: 304, 304L or 316L, decimal thickness rather than gauge, and the surface condition of the starting sheet.
- Tolerances. Critical dimensions toleranced one by one, plus a general tolerance in the title block.
- Finish. Polishing, passivation, anodizing or painting, with the visible face identified on the drawing.
- Required documents. Material certificate, dimensional inspection report, welder qualifications.
- Delivery date and location. An actual installation date, the address, and any dock or handling constraints.
Send the same package, at the same revision level, to every shop you consult. Comparing three prices built on three versions of the drawing compares nothing.
An unwritten tolerance gets paid for twice
In brief: without a general tolerance in the title block, each shop applies its own, and a part can meet the drawing without fitting the assembly.
The ISO 2768-1 standard on general tolerances exists for this reason. It sets, across four tolerance classes, the permissible deviations for linear and angular dimensions that have no individual tolerance, and it explicitly covers sheet metal parts. Citing the standard and the class in the title block settles dozens of dimensions at once.
The opposite trap is just as costly. In the same text, Gerald Davis shows the drawing of a simple sheet metal bracket with a note calling for ±0.0004 in. A requirement like that weighs on the price and can even lead the shop to decline the request.
The rule fits in one sentence: tolerance mating dimensions tightly, and let the general tolerance cover the rest. The typical sheet metal tolerances provide benchmarks by process.
A test before sending: highlight each individually toleranced dimension and note, for each one, the neighbouring part it touches. A dimension that touches nothing does not need a tight tolerance.
Request the material certificate with the quote
In brief: a 3.1 certificate and a 3.2 certificate do not involve the same party, the same cost or the same lead time.
When a specification requires a material certificate, it often designates it by its type under EN 10204. According to the British Stainless Steel Association's article on EN 10204 certificates, the 2004 revision retains only four types: 2.1, 2.2, 3.1 and 3.2.
The 3.1 provides test results specific to the lot and bears the signature of a manufacturer's representative independent of production. The 3.2 adds the signature of an independent inspector, appointed by the customer or by regulation.
The difference shows up in the schedule. A 3.2 certificate requires an external inspector to validate the tests, a step that has to be planned. State the required type in the request, and specify whether traceability must follow each part down to the heat number. Requiring a 3.2 after the sheet has been purchased can mean buying certified sheet all over again.
An estimate is built operation by operation
In brief: the price adds up material, time at each workstation, setups, finishing and inspection, then spreads fixed costs over the quantity.
The estimator starts by listing the required processes and the order in which they follow one another. Gerald Davis describes this step at the start of his series: each process has its own setup time and run rate. Next comes material, including the offcuts left by nesting parts on the sheet, and special purchases. He cites a custom extrusion that is only available in large quantities, several hundred feet.
Quantity therefore changes the unit price more than any other field. An illustrative example: if programming and setting up a press brake takes one hour, that hour is spread over 10 parts or over 200. The bending time for each part, on the other hand, barely changes.
Six gaps keep showing up in incomplete packages. For each one, the grid shows what the estimator assumes on your behalf and how it changes the quote.
| What is missing | What the estimator assumes | Effect on the quote |
|---|---|---|
| Specific grade | The most common grade, or the safest | Prices that cannot be compared |
| General tolerance | The shop's in-house values | Part that meets the drawing, not the assembly |
| Annual volume | A one-time order | Setups charged to a single batch |
| Visible face | Uniform finish everywhere, or none | Polishing left out or overbilled |
| Certificate type | None, or the simplest | Lead time added after the order |
| Required date | The shop's standard lead time | Schedule that does not match the job site |
The middle column explains most of the gaps between two quotes. When prices diverge sharply, ask each shop for its assumptions and exclusions, in writing.
Is your package complete, drawings, quantities and grade included? Send your drawings to get a quote within 24 to 48 hours.
Material prices set how long the quote stays valid
In brief: when metal prices move quickly, the offer's expiry date and the material clause matter as much as the total.
A quote is a snapshot of the day's prices. According to the September 2026 industrial product price indexes, published by Statistics Canada on October 22, 2026, unwrought aluminum and aluminum alloys cost 26.9% more than a year earlier. Copper and copper alloys had climbed 46.3%.
The agency notes that this index measures prices as they leave the plant and excludes customs tariffs. The price a shop actually pays for its sheet can therefore vary more.
Two lines of the quote should be read before the total: the offer's expiry date, and the clause stating whether the material price is fixed or indexed. An offer accepted after it expires is often repriced, and rarely downward when metal prices are rising.
Lead time starts with shop drawing approval
In brief: between the accepted quote and the delivered part, four milestones take up time, and the first one depends on the buyer.
The lead time written in a quote starts from a specific event. Read the whole sentence: "from receipt of purchase order" and "from drawing approval" do not give the same delivery date.
The lead time for a custom metal part breaks down into four milestones:
- Shop drawing approval. The shop produces the shop drawings and waits for your sign-off. Every week of internal review is added to the schedule. The steps of a custom project show where this moment fits in the overall process.
- Material procurement. A common grade and thickness often come out of a distributor's inventory. A duplex, a very large sheet or a 3.2 certificate may require a special order.
- Production queue. The order takes its place in the shop's backlog, among the other jobs.
- Finishing and shipping. A surface treatment, a custom crate or oversize transport each have their own lead time: ask whether they are included in the promised date.
For a fixed installation date, write it in the request rather than "as soon as possible." The shop can then tell you right away whether the schedule holds, and which milestone is the tightest.
Conclusion
A metal fabrication quote is won before it is requested. Every piece of information you leave out, the estimator assumes, and that assumption is what you end up paying for or waiting on.
Before sending, review the package with three questions. Would another shop price exactly the same part? Is the requested date an actual installation date? Is the certificate type written down? Once all three answers are yes, attach your drawings to your quote request.
FAQ
How long does it take to get a metal fabrication quote?
It depends mainly on the package. A metal fabrication quote for a simple part, with a dimensioned drawing, a specific grade and a quantity, can come back within 24 to 48 hours from shops that commit to it. A welded assembly, a 3.2 certificate or a sanitary finish lengthen the review, because the estimator has to consult their own suppliers. Send a complete package with the first request to avoid back-and-forth.
Can you get a quote without drawings?
Yes, but it remains a budget price. A dimensioned sketch, photos or an existing part to reproduce let the shop estimate an order of magnitude. The firm price comes after the shop drawings are produced, once every dimension, weld and finish is set. Some shops offer 3D modelling from a concept, which is then added to the price. Ask for the document to state whether it is a budget or a firm price.
How can you estimate a metal project before requesting a quote?
Only partly. List the operations for each part: number of cuts, bends, weld beads, surface to polish. This list reveals the heaviest cost items and the details worth simplifying. It does not replace the estimator, who knows their setup times, material offcuts and the day's sheet price. Use it to ask the shop the right questions, not to set a final budget.
Why are two quotes for the same part so different?
Rarely because of the hourly rate alone. Most often, the two shops did not price the same thing: a different grade, a forgotten finish, a certificate included or not, a quantity read as a one-time order. Exclusions at the bottom of the page, such as shipping or installation, also widen the gap. Ask each shop for a written list of its assumptions and exclusions, then compare line by line.
