What is due diligence (DD), and how can you do it yourself?

Due diligence (DD) is systematically checking a subject’s background before a major decision to reduce risk. For individuals the two most common forms are DD on a company/counterparty and DD on a property — using only lawful public data.

Company / counterparty DD

Before signing, paying a deposit, hiring a contractor or franchising, check the other party’s registration status, capital, age, and any major litigation or government blacklist.

Property DD

Check active faults, soil liquefaction, flood potential, nearby nuisance facilities, transaction prices and urban-renewal scope to avoid high-risk or hard-to-resell properties.

The legal line

Proper DD uses only public or self-authorized data. You may not pull someone’s criminal record, run an unauthorized credit score, or aggregate court judgments into an identifiable individual profile — these violate Taiwan’s Personal Data Protection Act.

Start with AI DD Map →

FAQ

Can an individual do DD alone?

Yes — company registries, judgments, geology and transaction prices are all free public data.

DD vs. a private investigator?

Proper DD uses only lawful public data; surveillance or pulling others’ personal data carries legal risk.

Official sources:個人資料保護法 / Taiwan PDPA、經濟部商工登記公示資料。
Public-data summary, not legal or investment advice. Updated:2026-06-20。