On-the-Ground Due Diligence in Germany

Why international companies, law firms and investors may need local verification before committing funds or relying on a business partner.

By Oliver Peth, investigator, profiler and owner of Privat Investigation Service Detegere
21 October 2026

A German company presents a professional website. Its registration details match an official record. The quotation looks convincing, and the contact person responds quickly.

For an international buyer or investor, these are useful starting points. However, an important question may remain: do the available records support the specific claims behind the proposed transaction?

A register entry cannot, by itself, establish that a supplier controls the advertised stock. Likewise, a genuine company name does not authenticate every person using it.

This is where investigative due diligence can add value. It connects documentary research with independent verification and, where justified, checks on the ground.

What Is On-the-Ground Due Diligence?

On-the-ground due diligence means checking specific business claims through lawful local inquiries, location verification or an appropriately authorised site visit. It complements company research, document analysis and open-source intelligence.

The objective is to establish whether the information presented to a client is consistent with what can actually be verified.

For example, a buyer may need to establish whether an address is a production facility, a distribution centre or an administrative office. An investor may need clarification about who operates a site and how it relates to the proposed investment.

The scope should follow the decision at stake.

What Company Records Can Tell You

Germany provides official sources for company research. The Company Register brings together information that companies are required to publish and provides access to register entries and submitted documents. The Common Register Portal of the German Federal States also provides access to several official registers. The central platform for company data

These sources are an important foundation. However, a transaction may raise questions beyond the information they contain.

A sound assessment distinguishes between a fact established by a source and a conclusion that still needs supporting evidence.

When Further Verification Makes Sense

Additional investigation should answer a material question. It is particularly useful when information conflicts or when a significant commitment depends on an unverified claim.

Possible triggers include:

• A supplier claims to manufacture products, but the production location remains unclear.
• A large advance payment is requested before stock or delivery arrangements can be verified.
• The company named in a quotation differs from the entity expected to perform the contract.
• Reference letters cannot be confirmed through independently identified contacts.
• A claimed warehouse, office or operational site does not match other available information.
• Questions about ownership, representation or business relationships remain unresolved.

These circumstances do not establish fraud. They identify questions that deserve clarification.

A shared office can be entirely legitimate. Production can be outsourced. A new company can have a credible business model. The investigation should consider those explanations and document them fairly.

A Genuine Company Name Does Not Authenticate the Contact

Company verification and contact verification address different risks.

Europol’s guidance on invoice fraud describes criminals impersonating suppliers or other creditors to redirect payments. It recommends verifying requests to change payment details through previously established contact information. europol.europa.eu

The practical lesson for due diligence is clear: confirming that a business exists leaves the identity and authority of a particular correspondent as a separate question.

An investigator may therefore compare the communication, documents and claimed relationship with information obtained through independently verified channels.

A visit to a genuine business address cannot, on its own, authenticate an unrelated email or quotation.

Two Fictional Examples

The following examples are entirely fictional. They illustrate investigative reasoning and do not describe identifiable Detegere clients or completed assignments.

Example 1: The Supplier With Outsourced Production

An overseas buyer considers ordering specialist components from a German supplier. During negotiations, the supplier refers to “our production” and provides photographs of machinery. However, the relationship between the company and the pictured facility is unclear.

Initial research confirms the supplier’s registration. Further inquiries establish that the machinery belongs to a separate manufacturing partner.

An authorised visit and supporting documentation clarify the arrangement. The German company manages sales and quality coordination, while its partner manufactures the components.

The findings support a legitimate explanation. They also help the buyer identify which entity is responsible for production, delivery and contractual commitments.

The value of the investigation is a clearer understanding of the supply arrangement.

Example 2: The Real Company Behind a False Offer

An international purchasing team receives an attractive offer using the name and registration number of an established German business. The documents appear consistent, but the email domain differs from the company’s independently identified website.

The registration check confirms that the business exists. It does not resolve the discrepancy.

The purchasing team commissions further verification. Contact through an independently established company channel reveals that the offer was not issued by the business and that the supposed representative is unauthorised.

The team suspends the proposed payment and preserves the correspondence for further assessment.

In this example, independent contact verification answers the critical question. A site visit would add little once the discrepancy has been resolved.

How Detegere Approaches Investigative Due Diligence

Detegere combines company research, OSINT, document review and local verification according to the assignment. Sensitive mandates are personally coordinated by Oliver Peth, with specialist or international support where required. Wirtschaftskriminalität aufklären

Our due diligence investigations follow a structured approach.

1. Define the Decision and the Open Questions

We first clarify what the client needs to decide. This could involve a payment, a supplier relationship, an investment or a disputed business claim.

We then identify which facts matter to that decision and agree the scope of work.

2. Review the Available Information

Relevant records, correspondence, documents and public sources are reviewed together. Inconsistencies are recorded, and information gaps are identified.

Source dates matter. A historical record and a current statement may refer to different circumstances.

3. Select Targeted Verification Measures

Depending on the unresolved questions, further work may include independent business inquiries, document confirmation, location checks or an authorised site visit.

Each measure should have a defined purpose. A physical visit is useful when it can answer a question that remains open after research.

4. Report Findings and Their Limits

The report explains what was checked, which sources were used and what the findings support. It also records unresolved issues and limitations.

This gives the client and their advisers a documented basis for deciding what to do next.

What a Useful Verification Report Should Contain

International clients need findings they can understand and assess. A useful report should include:

• The objective and agreed scope of the assignment.
• The sources reviewed and the dates of relevant checks.
• The verification steps undertaken.
• Findings linked to their supporting material.
• A clear distinction between observations, third-party statements and analysis.
• Relevant explanations that support or weaken the initial concern.
• Outstanding questions and the limits of the work.

For example, observing that premises are closed during one visit supports a statement about that visit. It does not, by itself, establish that the business has ceased operating.

Similarly, seeing goods at a warehouse does not establish who owns them or whether they are available for a particular order.

Accurate reporting preserves those distinctions.

Proportionate Fieldwork and Responsible Data Handling

The method matters as much as the finding.

The European Commission’s overview of GDPR principles explains requirements including lawful processing, purpose limitation, data minimisation, accuracy and security. commission.europa.eu

Where personal data is involved, the applicable legal basis and obligations must be assessed. Local inquiries and site visits also require consideration of access rights and other applicable rules.

At Detegere, the proposed measures are assessed against the purpose and circumstances of the assignment. Access to non-public premises requires appropriate authorisation.

Where legal proceedings are contemplated, the investigative scope and documentation should be coordinated with legal counsel. The admissibility and weight of evidence remain matters for the relevant court.

Support for International Clients and Professional Partners

An overseas client may have extensive documentation but still need a specific fact checked in Germany.

Detegere supports companies, law firms, investors, insurers and professional investigation partners with investigative work in Germany.

Assignments can be defined around a particular location, document, business claim or unresolved relationship. Communication and reporting are available in English or German.

Oliver Peth combines criminalistics training at ZAD in Berlin with a commercial background and experience coordinating international investigations. This supports an approach that considers both the evidence and the business decision behind the assignment. Wirtschaftskriminalität aufklären

Frequently Asked Questions

Is a German company registration enough to confirm that a supplier is reliable?

It establishes relevant recorded information about the entity. Reliability for a particular transaction requires consideration of additional questions, such as the authenticity of the contact, the supply arrangement and the claims being made.

Does every background check require a site visit?

No. Research or independent document and contact verification may answer the relevant questions. A site visit is appropriate when it can resolve a material issue that remains open.

What can a business location check establish?

It may clarify the nature of a location and the activities observable during the check. It cannot automatically establish ownership of goods, financial stability or the ability to fulfil a future contract.

Does a discrepancy mean that fraud has occurred?

No. Differences may arise from outdated information, outsourcing, relocation or an unclear description. An investigation should examine credible explanations before drawing conclusions.

Can Detegere work for an international screening or due diligence provider?

Yes. A German verification assignment can be agreed around specific questions, reporting requirements and permitted measures. The scope and handling of information are clarified before work begins.

Can the findings be provided in English?

Yes. Reporting can be prepared in English and structured for the client’s internal review or assessment by legal advisers.

Request a Confidential Assessment

Before committing funds or relying on an important business claim, identify what has been verified and what remains uncertain.

If you need company research, supplier verification or targeted local inquiries in Germany, contact Detegere with a brief description of the proposed transaction, the parties involved and the questions you need answered.

We will assess which checks could help and define an appropriate scope.

Privat Investigation Service Detegere
Oliver Peth · Germany · International coordination
Email: oliver.peth@kriminalistik.info
International telephone: +49 6023 9296880

Picture: KI generated