Checklist

How to vet a manufacturer before you commit

Due diligence is not about finding a "perfect" factory. It is about reducing unknowns: confirming capability fit, operational seriousness, and aligned expectations before you pay for tooling or lock in a launch date.

A note about Combinate's role

Combinate provides software for discovery and collaboration; we do not verify or certify users or factories. You remain responsible for your own checks, agreements, and compliance decisions. This article describes common practices many brands use — not a guarantee.

Quick checklist
Confirm capability fit — do they make products like yours?
Verify registered business identity and trading address
Request specific examples of similar work
Ask how they handle inspection and non-conformance
Get written quotes with clear assumptions
Agree approvals, IP, and commercial terms in writing

Start with fit, not flattery

Before you evaluate trust, evaluate match: does this factory routinely produce products like yours, at similar complexity and volumes? A great factory for aerospace machining may be the wrong partner for apparel — and vice versa.

Ask for relevant examples without expecting them to reveal confidential customer names. Look for specificity: processes, tolerances, materials, and how they handled changes or challenges.

Ask for evidence you can verify

Policies on a website are not the same as operational proof. Depending on the category, brands often review:

Company identity

Registered business details and a stable trading address appropriate to the work claimed. You can check Companies House for UK-registered firms.

Capability proof

Equipment and process steps that align with your product — not generic stock photos. Ask for specifics about capacity, typical batch sizes, and turnaround.

Quality practices

How they inspect, measure, and handle non-conformance. If you need certifications, ask what applies to your product and supply chain.

Commercial clarity

Written quotes that separate tooling, unit price, revisions, and what happens if scope changes.

Red flags worth slowing down for

None of these automatically mean "bad factory" — but they are reasons to ask more questions before proceeding.

Vague quotes

No assumptions stated, especially on materials, tolerances, or compliance. If they can't be specific, it may cost you later.

Pressure to skip formalities

Unwillingness to put things in writing or pressure to pay in ways that remove your recourse.

No quality process

Unwillingness to discuss inspection, samples, or change control when asked directly.

Absolute claims

"We guarantee compliance" without evidence tied to your product category. Real compliance is specific, not generic.

Align expectations before money moves

Agree how you will communicate, how approvals work, and what "done" means for samples and production. Put commercial boundaries in writing:

Payment milestones
Deliverables per stage
Revision rounds
NDA / confidentiality
IP ownership
Rejection criteria

If you are new to manufacturing contracts, get professional advice. Templates are not a substitute for advice tailored to your situation.

Use the glossary to speak the same language

Shared vocabulary reduces misunderstandings. If a term is unfamiliar — RFQ, tooling, first-off sample, MOQ — look it up and ask clarifying questions rather than guessing.

Browse the glossary

Ready to find the right partner?

Combinate helps you discover and compare UK manufacturers. Post your project, get quotes, and collaborate — all in one place.

Disclaimer: This article is general information for businesses. It is not legal advice. For contracts, IP, and compliance, seek qualified professionals.