10 Best Private Investigators in Singapore (2026)
A shortlist of licensed private investigation agencies in Singapore, covering surveillance, matrimonial, background-check and corporate fraud cases.
- Edited by
- Amir Wahab
- Published
- Reading time
- 7 min read
AI image by LocalRankSingapore requires anyone who carries out private investigation work for reward, and the agencies that employ them, to hold licences issued by the Police Licensing & Regulatory Department (PLRD) of the Singapore Police Force. That framework covers the work below: surveillance, matrimonial and infidelity investigations, background and pre-employment checks, and corporate, insurance or fraud cases. The firms on this shortlist are active, contactable Singapore agencies; where one states its own licence number or licensing status, that is presented here as its own claim rather than something independently verified against a public register, since Singapore does not publish one. Confirm licensing, scope and cost directly with any firm before engaging it.
1. Kokusai Security
Kokusai Security says it was founded in April 1984, making it one of the longest-running names in Singapore's investigation and security sector, and states it was graded 'A' (Excellent) by the Singapore Police Force in 2020. Management is described as former police and law-enforcement officers, including an ex-Commissioner of Prisons. Its listed private-investigation services cover infidelity and cheating-spouse cases, family and domestic-violence matters, child custody disputes, missing-person cases and general civil and commercial investigations, alongside a separate line of executive-protection and security-guarding work. The firm is based at Peninsula Plaza near City Hall. Its long track record and police-grading claim make it a reasonable firm to ask for references from, given how few competitors cite an official grading.
2. CPIS LLP
CPIS, which also goes by the name Commercial Investigations, says it was established in 1990 and describes itself as a licensed private investigation firm regulated under Singapore's Ministry of Home Affairs framework, which covers the Police Licensing & Regulatory Department. Its stated services include matrimonial and infidelity investigations, corporate fraud and employee misconduct cases, background checks covering pre-employment, criminal record and tenant screening, due diligence, field surveillance, skip tracing and asset location, and litigation support. The firm is based at Goldhill Centre on Thomson Road, near Novena. Its skip-tracing and asset-location work, alongside the more usual matrimonial and corporate caseload, points to a firm also used for debt-recovery and litigation-support cases.
3. Asia Top Investigation
Asia Top Investigation says it was founded by Vincent Tan and has operated since 1990, and lists a Private Investigation Agency licence issued by the PLRD, with its licence number published on its own site. Its services as described on its site include matrimonial and infidelity investigations, pre-matrimonial checks, corporate and commercial investigations, digital forensics, general investigations and surveillance, and background checks. The agency is also listed in the Law Society of Singapore's Specialist Services Directory, which the Law Society states it does not vet or endorse. Its long operating history and digital forensics capability make it a candidate for cases that combine physical surveillance with electronic evidence.
4. International Investigators
International Investigators says it is licensed by the PLRD and describes its team as certified members of the Council of International Investigators (USA) and the World Association of Professional Investigators (UK). Its stated case types include matrimonial and family matters such as infidelity evidence and child custody, commercial cases such as copyright and trademark infringement and employee movement, and both local and overseas surveillance. The firm, which also runs a matrimonial-focused site under the name CatchCheating, operates from Albert Street near Bugis and says it draws on an in-house family counsellor and legal counsel. Its overseas network stands out for cases that cross borders, such as a spouse or business partner based outside Singapore.
Bugis / Rochor
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5. Privateye Investigation & Consultancy
Privateye Investigation & Consultancy is a Singapore firm that describes itself as a licensed private investigation agency, founded in 2014 by Jeffrey Lim, a former Singapore Police Force officer with more than three decades in investigative work. Its stated range covers matrimonial cases such as surveillance for suspected infidelity, commercial investigations including due diligence and staff moonlighting, work injury compensation (WICA) checks, and general surveillance spanning undercover work and digital forensics. The firm is based out of Shenton Way in the CBD. Its police background and broad case mix make it a reasonable starting point for both personal matrimonial matters and workplace disputes that need documented evidence.
Shenton Way (CBD)
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6. Ace Private Investigations
Ace Private Investigations says it has been operating in Singapore for more than 19 years and describes itself as licensed by the Police Licensing & Regulatory Department (PLRD). Its listed services span matrimonial and adultery investigations, corporate work such as employee background checks, misconduct and theft cases, insurance and work-injury claim investigations, child custody cases, and general surveillance and evidence gathering. The firm operates from Golden Landmark on Victoria Street, near Bugis. Its spread across both personal matrimonial cases and corporate HR-type investigations makes it a firm worth shortlisting for employers as well as individuals.
7. 122 Truth Agency
122 Truth Agency says it has more than 20 years of private investigation experience and describes itself as a licensed private investigation agency in Singapore, though it does not name the licensing body on its site. Its listed services include surveillance and undercover operations, matrimonial and adultery investigations, background checks, corporate fraud and employee misconduct cases, missing-persons work, digital forensics on computers and phones, technical surveillance countermeasures (bug sweeping), and cross-border investigations. The agency operates by appointment from Ngee Ann City on Orchard Road. Its stated focus on producing evidence suitable for legal or HR use, alongside bug-sweeping, sets it apart from firms that only describe general surveillance.
8. Detective Don PI
Detective Don PI states on its site that it is licensed by the PLRD and says its investigators include former Singapore Police Force officers. Its listed services cover cheating-spouse and matrimonial investigations, corporate investigations, child custody cases, surveillance, undercover and espionage-style assignments, and mystery-shopper work, alongside counselling support for clients going through a case. The firm advertises 24/7 customer service and publishes indicative hourly rates on its own site rather than requiring a private quote. Its pairing of investigation work with counselling support is aimed at clients dealing with the emotional side of a matrimonial case, not just the evidence-gathering.
Islandwide
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9. Baker Street Private Investigator (BSPI)
Baker Street Private Investigator, known as BSPI, lists a Private Investigation Agency licence under the Private Security Industry Act, with its licence number published on its site,, and says it operates only through lawful methods under that licence. The firm's stated scope covers surveillance across Singapore, matrimonial and family investigations, commercial work including corporate fraud and IP-related cases, litigation support, pre-employment and pre-marital background checks, and missing-person tracing. It is based at High Street Centre near City Hall. The explicit licence number on its site is unusual among Singapore PI firms and gives clients an easy detail to verify before engaging it.
10. Eyes Private Investigator
Eyes Private Investigator states that it holds a PLRD licence and publishes its licence number on its site, and says its team is made up of former Singapore Police Force officers. Its listed services include surveillance using what it describes as up-to-date technology, matrimonial and infidelity investigations, background checks on individuals, organisations, children and fiancés, skip tracing for missing persons, corporate fraud investigations, insurance-claim investigations, and legal investigations for civil and criminal matters. The firm does not publish a street address on its site, operating on an appointment and phone-contact basis. Its scope reads closer to corporate and insurance-claim work than most of the matrimonial-heavy sites on this list, making it worth a call for background-check or fraud cases in particular.
Islandwide
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How to choose
- Verify the licence. Ask for the firm's PLRD private investigation agency licence and the individual investigator's licence, and check the details match who you're dealing with. Singapore does not currently publish a searchable public register, so a written quote or engagement letter that states the licence number is the safest way to confirm it before paying anything.
- Match the specialism. Matrimonial surveillance, workplace or corporate fraud, background screening and child-custody evidence call for different skills and, often, different documentation for the case to hold up later. Ask directly whether the agency regularly handles your type of case and what a typical engagement covers before you commit.
- Ask how evidence is gathered and reported, and whether it would be usable in court, HR proceedings or an insurance claim if you need that later. Get this in writing rather than assuming, since firms differ in how they document surveillance, and requirements differ by the use you have in mind.
- Discuss scope and cost upfront. Rates vary by case complexity, number of investigators, hours of surveillance and whether work is local or overseas, so ask for a written estimate and what happens if the case runs longer than expected, rather than relying on a headline hourly figure.
- Confirm contact details, business address and current licensing status directly with the firm, since listings and company details can go out of date. A short initial consultation is also a reasonable way to gauge how the agency communicates before handing over a retainer.
. No changes recorded since.
Founder and Editor
Amir Wahab is the founder and editor of LocalRank, an independent Singapore rankings and local guides publication.
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