Custom Fabrication Buyers Guide: What to Know Before You Request a Quote
To choose a custom fabricator, verify certifications, quality control, equipment capacity, engineering support and delivery record, then compare quotes on total cost, not just price. We suggest checking five things in order: relevant certifications (CWB, AWS, and the CSA W47.1 and W59 standards), documented quality control, equipment and capacity that fit your part, design-for-manufacturability support, and a track record of on-time delivery.
Why that order? Certifications and quality systems tell you whether a shop can build the part safely and repeatably. Capacity tells you whether it can build your part at all. Design support and delivery history tell you how smoothly the job will run.
Price matters, of course, but the cheapest quote is often not the lowest total cost. Rework, late shipments and failed inspections usually cost far more than a small price gap between bidders. A shop that quotes low and then misses a delivery date can shut down a production line, and that bill won't appear on the quote.
You should also confirm that custom work is the right route in the first place. Custom fabrication makes sense when standard equipment can't meet your dimensions, load, process or compliance needs. Off-the-shelf makes sense when it can. Our article on whether custom fabrication beats off-the-shelf equipment walks through that decision.
We've written this guide for beginners and for buyers in automotive, mining, construction and environmental sectors across Ontario. It includes an evaluation scorecard, a red-flag list, an RFQ checklist and answers to common questions. For a broader view of partner selection, you can also read our guide to selecting a metal fabrication partner.
Fabrication vs. Machining vs. Structural Steel: Match the Scope to the Shop
Before you compare shops, work out which kind of work you actually need. Fabrication builds assemblies from cut and welded metal, machining refines parts to tight tolerances, and structural steel covers load-bearing building components. Shops often specialize, so the label on your project shapes who should quote it.
Fabrication cuts, forms and welds sheet, plate and tube into assemblies such as frames, hoppers, guards and process equipment. Think of it as building the body of a machine or structure.
Machining removes material to hold tight tolerances on shafts, housings and mating surfaces. If two parts must fit together within a few thousandths of an inch, you're in machining territory.
Structural steel covers beams, columns and connections. In Canada it usually triggers CWB certification requirements under CSA W47.1 and W59, because the welds carry building or equipment loads. If your project involves this scope, review our structural steel services to see what that work looks like.
Many projects combine all three. A conveyor frame might need fabricated plate, machined bearing seats and structural connections. A shop that handles them under one roof reduces handoffs and tolerance stack-up, which is the slow build-up of small errors when parts pass between vendors.
Cutting method matters too. Laser suits thin to medium material with fine detail. Waterjet suits heat-sensitive or thick material because it doesn't create a heat-affected zone. Plasma suits thick plate economically. Our guide on choosing between laser and waterjet cutting helps you match the method to your material and tolerance needs.
Finally, think about how you'll place the order. Our overview of how custom fabrication orders are placed in Ontario explains the typical workflow, from sending drawings to approving a quote.
7 Criteria for Evaluating a Custom Fabrication Shop
The seven criteria: certifications, quality control, traceability, equipment and capacity, design support, lead times, and communication. Here's what to look for in each.
1. Certifications. CWB certification under CSA W47.1 is typically required for structural steel in Canada. AWS credentials and CSA W59 welding procedures show the shop uses qualified processes. Ask for current certificates and the number of qualified welding procedures. More procedures usually means more flexibility across materials and joint types.
2. Quality control. Look for documented inspection plans, dimensional reports, non-destructive testing (NDT) capability or trusted partners, and corrective-action records. A shop that tracks and fixes its own mistakes is one you can rely on. See the quality standards and certifications to look for for a practical reference.
3. Material traceability. Mill test reports and heat numbers tied to specific parts matter for mining, automotive and pressure-related work. If a part fails in the field, traceability lets you find out why and which other parts are affected.
4. Equipment and capacity. Check cutting, forming, welding and machining equipment, crane capacity and floor space against your largest and heaviest part. You can confirm equipment and capabilities match your project before you send drawings.
5. Design-for-manufacturability support. CAD, 3D modelling and prototyping catch costly problems before steel is cut. A fabricator who suggests a simpler bend or a better weld joint saves you money.
6. Lead times and delivery. Ask for on-time delivery rates and whether just-in-time or scheduled releases are offered. A promised date means little without a track record behind it.
7. Communication and relationships. Long client relationships, named project contacts and references show reliability. If a shop has served the same customers for decades, that says something.
Score each shop with a weighted scorecard
Rate each criterion from 1 to 5, then apply weights. For structural or safety-critical work, weight certifications, quality and capacity highest. This table shows one sample weighting you can adjust.
| Criterion | Evidence to request | Safety-critical weight |
|---|---|---|
| Certifications | Current CWB and AWS certificates | 20% |
| Quality control | Inspection plan, sample report | 20% |
| Traceability | Mill test report example | 10% |
| Equipment and capacity | Equipment list, crane rating | 20% |
| Design support | CAD or 3D model samples | 10% |
| Lead times | On-time delivery rate | 10% |
| Communication | Named contact, references | 10% |
Location can help too. Kitchener-Waterloo shops sit near automotive and industrial supply chains, which shortens freight and speeds material sourcing. If you also buy raw material directly, our guide to evaluating industrial metal suppliers covers that side of the chain.
For reference, BSG Inc has operated since 1987, holds CWB and AWS certifications with 30+ welding procedures, runs a 44,000 sq ft facility, and offers CAD and SolidWorks 3D modelling plus 3D printing. Use those numbers as a benchmark when you score other shops.
What Drives Fabrication Cost and Lead Time
Understanding cost drivers helps you read a quote and ask better questions. The main ones are material type and grade, part complexity, welding and fit-up hours, tolerances, finishing (paint, galvanizing, powder coat) and volume. Our breakdown of the factors that drive fabrication project costs goes deeper on cutting-related pricing.
Tighter tolerances and exotic alloys raise cost, so specify only what the function needs. A non-mating edge rarely needs the same tolerance as a bearing seat. Calling out one tight tolerance across a whole drawing can add hours you don't need to pay for.
Steel plate projects carry cost from cutting, forming, weld prep and handling of heavy material. Every lift and move takes crane time and labour. If plate is your main material, read about steel plate project budgets before you finalize a number.
Volume changes the math as well. Small batches carry higher unit cost because setup time is spread over fewer parts. They also avoid inventory and suit prototypes or replacement parts. If that's your situation, look into small run fabrication options and ask about repeat-order pricing.
Lead time depends on more than the shop floor
Lead time depends on material availability, shop queue, engineering approval and finishing. Laser cutting alone can be quick, while complex assemblies take longer. See realistic lead time expectations for typical ranges on cut parts.
Ask every shop to break its quoted lead time into five parts: engineering, material, fabrication, finishing and shipping. Where one shop says "six weeks" and another says "four weeks" without detail, the breakdown shows whether they're really comparing the same thing. It also shows where you can save time, for example by approving drawings faster or supplying material.
Red Flags When Choosing a Custom Fabricator
The biggest red flags are missing certifications, an unusually low quote, and vague scope. Watch for these warning signs during quoting, because they rarely improve once production starts.
- Reluctance to show current CWB or AWS certificates or welding procedure records. A certified shop is usually proud to share them.
- A quote far below the others. This often signals missed scope, cheaper material or skipped inspection.
- Vague quotes with no line items, assumptions, exclusions or lead time. You can't compare what isn't written down.
- No questions about your drawings, tolerances or application. That suggests no engineering review is happening.
- No references or reluctance to share past projects in your industry.
- Equipment that can't handle your part size, forcing outsourcing without disclosure. Outsourced work can change quality and lead time.
- No documented inspection process or material traceability.
- Slow or inconsistent communication during quoting. It usually gets worse during production.
One red flag doesn't always rule a shop out. A new shop may lack a long reference list, for instance. But two or three together should make you pause. Our guide on selecting a metal fabrication partner offers more detail on separating a fair price from a risky one.
RFQ and Vendor Evaluation Checklist
A strong request for quote (RFQ) gets you accurate, comparable pricing. Checklist block: drawings, material, quantity, tolerances, finish, certifications, inspection documents, delivery date. Here's the full list to send with every RFQ.
- Drawings or CAD files
- Material and grade
- Quantities and annual volume
- Tolerances
- Finish (paint, galvanizing, powder coat)
- Required certifications
- Inspection and documentation needs
- Delivery date and location
Common RFQ mistakes include incomplete drawings, unstated tolerances, missing quantities, and no mention of certification requirements. Each one leads to guesses, and guesses lead to change orders. Our walkthrough on how to request and compare fabrication quotes shows the process step by step.
Questions to ask each shop
- Which certifications apply to this job?
- What is your on-time delivery rate?
- Who inspects, and how?
- What is the largest part you can lift and weld?
- Can you help improve the design?
Compare quotes on the same basis
Line up scope, material, finishing, freight, lead time, payment terms and warranty. If one quote leaves out freight or finishing, add a realistic figure before you compare totals. Then score each shortlisted shop from 1 to 5 on the seven criteria and total the weighted results.
For larger projects, request a facility visit or virtual walkthrough before awarding the work. Seeing the floor, the cranes and the inspection area tells you more than any brochure.
How BSG Inc Meets Every Criterion
We built BSG Inc around the same criteria we've outlined here, so you can score us as you would any other shop.
- Certifications: We're CWB and AWS certified with 30+ welding procedures. You can review our quality standards and certifications at any time.
- Experience: We've served Ontario industry since 1987, which is over 35 years of fabrication work.
- Capacity: Our 44,000 sq ft Kitchener facility has extensive crane and equipment capacity. See our capabilities to match your largest part against our equipment.
- Design support: CAD, SolidWorks 3D modelling and 3D printing let us prototype and refine designs before cutting steel.
- Delivery and pricing: We offer just-in-time delivery and competitive pricing.
- Relationships: We hold long-term client relationships across automotive, mining, construction and industrial process equipment. If you build for vehicles, our automotive fabrication page shows what we do there.
Send us your drawings and we'll quote the job. Then put our quote through the scorecard above and compare it with any other bid. You can start at www.bsginc.ca.
Custom Fabrication Buyers Guide FAQ
How do I choose a custom metal fabricator?
Verify certifications such as CWB and AWS, review quality control and traceability, confirm equipment and crane capacity fit your part, ask about design support, and check references and delivery record. Then compare itemized quotes on total value rather than price alone. Our guide to choosing a fabrication vendor has more detail.
Do I need a CWB-certified fabricator?
For structural steel in Canada, usually yes. CWB certification under CSA W47.1 is commonly required by codes, engineers and owners. Even for non-structural work, certification shows qualified welders and documented procedures. Confirm your project's specification before awarding the work.
What should I include in a fabrication RFQ?
Include drawings or CAD files, material and grade, quantities, tolerances, finishing, required certifications and documentation, and delivery date and location. Complete information produces accurate, comparable quotes and fewer change orders once production starts.
What affects the cost of custom fabrication?
Material type and grade, part complexity, welding time, tolerances, finishing and order volume are the main drivers. Simplifying designs and specifying only the tolerances your application needs can reduce cost without hurting how the part performs.
How long does custom fabrication take?
It varies with part complexity, material availability, shop workload and finishing. Simple cut parts can be quick, while welded assemblies take longer. Ask for a lead time broken into engineering, material, production, finishing and shipping so you can see where time goes.
Can I order small batches of custom parts?
Yes. Many shops handle prototypes and small runs, though unit prices are higher because setup is spread over fewer parts. Ask about minimums and whether pricing improves with repeat orders, and confirm the shop will keep your drawings on file.