10 Questions to Ask Your Sheet Metal Fabricator

A practical checklist for procurement & engineering teams

Not all fabricators are equal. Whether you’re reviewing your current supply chain or evaluating a new partner, these questions will help you identify who can genuinely deliver and who will cost you more than their invoice suggests.

1) Can you handle the full process in-house?
Every handoff between suppliers adds lead time, cost and risk. A fabricator who can laser cut, fold, weld, finish and assemble under one roof gives you far more control over quality and schedule.

What good looks like: All core processes in-house, with assembly capability, not just cut parts sent elsewhere for finishing.
2) Can you deliver complete, finished assemblies, not just components?
Receiving individual parts that still need fitting, finishing or assembly shifts work back onto your team. A supplier who delivers a finished unit removes that burden entirely.

What good looks like: Proven assembly capability with examples of completed units delivered ready to use or integrate.
3) What quality accreditations do you hold?
Accreditations aren’t just paperwork, they tell you whether a supplier has documented processes, consistent quality controls and independent audit oversight.

What good looks like: ISO 9001 as a minimum. ISO 14001 for environmental standards. Sector-specific approvals relevant to your industry.
4) How do you handle repeat and runner work?
A fabricator set up for one-off projects will struggle with consistent repeat production. You need someone whose systems and scheduling are built for ongoing supply.

What good looks like: A clear process for managing repeat orders, including scheduled production slots, stored tooling, consistent lead times and proactive communication. Look for a manufacturer that uses a recognised ERP system to manage production planning, stock and order tracking, ensuring reliability as volumes grow.
5) What batch sizes do you work with?
Some fabricators only work efficiently at high volume; others focus purely on prototypes. You need a supplier whose sweet spot matches your actual requirements.

What good looks like: Flexibility across small and medium batch sizes, with the ability to scale as your requirements grow.

6) Can you support the engineering and design stage?
Getting a fabricator involved early, before designs are locked can save significant cost and avoid manufacturability issues downstream.

What good looks like: Estimating and engineering experience that adds value before you go to production, not just a team that quotes what they’re given.
7) What is your typical lead time, and how do you handle urgent requirements?
Lead times vary widely across the sector. Knowing how a supplier responds under pressure tells you a lot about how they’ll perform as a long-term partner.

What good looks like: Honest, realistic lead times and a track record of responsiveness when schedules change.
8) What materials do you regularly work with?
Not all fabricators are equally comfortable across material types. Mismatched expertise leads to quality issues and delays.

What good looks like: Demonstrated experience with the specific materials your parts require, whether that’s mild steel, stainless steel, galvanised steel, aluminium or other specialist materials.
9) How do you manage quality at each stage of production?
Catching problems at the end of a production run is expensive. You want a supplier with in-process checks, not just a final inspection.

What good looks like: Documented inspection points at key production stages, with traceability back through the job.
10) What does your customer relationship look like in practice?
A fabricator who is hard to reach, slow to quote and reactive to problems will cost you more than their invoice suggests.

What good looks like: A named point of contact, consistent communication, proactive updates on jobs and clearly defined service levels. Look for agreed response times, escalation processes and a supplier who wants to understand your business, not just fulfil individual orders.