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Best Private Investigators in San Francisco, CA

Our Recommended Top 11

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Our goal is to connect people with the best local professionals. We scored San Francisco Private Investigators on more than 25 variables across five categories, and analyzed the results to give you a hand-picked list of the best.

203Reviewed

126Curated

11Top Picks

Learn about our selection process.

Providers

featured provider = Featured Provider

Novato, CA 94948

Expertise.com Rating

Review Sources

Facebook
5.0 (2)

Why choose this provider?

Jackson P.I. Services is a private investigations agency in Novato, California. The owner and founder, Julie Jackson began her career in law enforcement in 1997, working as a police officer and private investigator in the San Mateo County. Jackson P.I. Services offers personal/private, attorney services, and business services. They do dating checks, self-checks, and real estate checks. They are affiliated with associations such as the California Association of Licensed Investigators and Domestic Violence Prevention Association.

Oakland, CA 94609

Expertise.com Rating

Review Sources

Google
5.0 (1)
Yelp
5.0 (1)

Why choose this provider?

Tamara Thomson Investigations is a private investigations agency in Oakland, California, serving the informational needs of their customers for more than 18 years. Their services include labor and employment investigations, business litigation research, conducting business due diligence, legitimacy of real estate conveyances, genealogy tracing for real estate quiet title, landlord/tenant disputes, and more. Tamara Thomson Investigations tailors their investigative strategies to suit their clients’ objectives.

Martinez, CA 94553

Expertise.com Rating

Review Sources

Google
4.5 (2)

Why choose this provider?

Perez Investigations Inc. is a private investigations agency in Martinez, California, founded in 1982 and serving San Jose, Sacramento, San Francisco, Hollywood, and beyond for more than 35 years. Their investigative services include worker’s compensation- AOE/COE and sub-rosa, and domestic investigations- child custody and infidelity. Perez Investigations Inc. also offers attorney services.

Pleasanton, CA 94588

Expertise.com Rating

Why choose this provider?

Gab Investigations is a private investigations agency in Pleasanton, California, serving California for over 35 years. They are committed to providing comprehensive quality services in a reliable, professional manner. Gab Investigations specializes in investigations for attorneys, insurance investigations, general liability, surveillance, workers compensation, background investigations, and locates/skip tracing. Gab Investigations is bonded and licensed by the State of California.

Redwood City, CA 94062

Why choose this provider?

R.A. Nosek Investigations is a private investigations agency in Redwood City, California, serving the community for more than 40 years. Their investigative services include employment screenings - GLB, F.C.R.A. and HIPPA compliant, background investigations, insurance claims, sub rosa, AOE/COE, fraud investigation, elder financial abuse, identity theft investigation, and more. R.A. Nosek Investigations is a member of the California Association of Private Investigators.

Oakland, CA 94612

Expertise.com Rating

Why choose this provider?

Kidd Investigative Services is a private investigations agency in Oakland, California. Hugh Kidd, the owner of Kidd Investigative Services has over 15 years of law enforcement experience. Their services include background checks and investigations, digitally recorded witness statements, traffic accident investigations, driver and vehicle record services, surveillance services, process server services, and more. Kidd Investigative Services is a member of BSIS.

San Bruno, CA 94066

Expertise.com Rating

Review Sources

Google
4.9 (13)

Why choose this provider?

Foglight Investigations is a private investigations agency in San Bruno, California, founded and owned by a former law enforcement officer Artur Tilis. He has over 10 years of experience of being in the San Francisco Police Department. Their services include Background Checks, Surveillance, Counter Surveillance, Cheating Spouse, Dating Background Checks, Asset Investigation, and more. Foglight Investigations provides free consultations for new clients.

San Francisco, CA 94111

Expertise.com Rating

Review Sources

Yelp
5.0 (17)
Facebook
3.0 (1)

Why choose this provider?

DeWitt Detective Agency is a private investigations agency in San Francisco, California, founded in 1999. It has been the top private investigative firm in the San Francisco Bay area for more than 15 years. DeWitt Detective Agency can help their clients with missing persons, infidelity/cheating spouse, missing and runaway kids, surveillance cases, background investigations, undercover operations, and more. DeWitt Detective Agency is proudly affiliated with the California Association of Licensed Investigators, Professional Investigators of California, National Council of Investigation & Security Services, and more.

San Francisco, CA 94114

Expertise.com Rating

Review Sources

Facebook
5.0 (9)
Google
5.0 (1)

Why choose this provider?

Passanisi Investigations is a full service investigations agency in San Francisco, California, established in 1998. Passanisi Investigations is a statewide investigations firm. Aside from San Francisco, they also have offices in Sonoma and Los Angeles. They specialize in workers' compensation investigations -- sub rosa, AOE/COE, personal injury investigations, background checks, and pre-employment screening.

San Francisco, CA 94121

Expertise.com Rating

Review Sources

Google
5.0 (20)
Yelp
5.0 (8)
Facebook
5.0 (2)

Why choose this provider?

Filley & Associates Professional Investigations is a private investigations agency with of in San Francisco and San Rafael, California. It was established by Scott E. Filley, a certified private investigator and former FBI agent for 24 years. Their services include attorney services, business services, insurance services, consumer services, and China investigations. Filley & Associates Professional Investigations is a member of associations like ASIS, AIASS, BBB, NCISS, and more.

3705 Haven Avenue, Menlo Park, CA 94025

Expertise.com Rating

Review Sources

Yelp
4.0 (8)
Google
5.0 (4)
Facebook
5.0 (2)

Why choose this provider?

Tony Vain Investigations performs private investigations for clients near San Francisco. The agency offers a diverse range of services focusing on civil, corporate, and criminal cases such as infidelity, employee integrity, and background investigations. Its investigators are of high personal moral character and have professional work ethics while it uses the latest in video surveillance technology and advanced equipment to work on cases. Tony Vain Investigations is a member of the California Association of Licensed Investigators and the World Association of Detectives, Inc.

Compare our Top Private Investigators

NameExpertise RatingAddressPromotionsLearn more
Jackson P.I. Services
Novato, CA 94948
Tamara Thomson Investigations
Oakland, CA 94609
Perez Investigations Inc.
Martinez, CA 94553
Gab Investigations
Pleasanton, CA 94588
R.A. Nosek Investigations
Redwood City, CA 94062
Kidd Investigative Services
Oakland, CA 94612
Foglight Investigations
San Bruno, CA 94066
DeWitt Detective Agency
San Francisco, CA 94111
Passanisi Investigations
San Francisco, CA 94114
Filley & Associates Professional Investigations
San Francisco, CA 94121
Tony Vain Investigations - San Francisco
3705 Haven Avenue, Menlo Park, CA 94025

FAQs

  • Introduction

    Some cases grow cold without ever getting solved by the police, and others tend to be too unorthodox for the police since they're mainly limited to criminal cases. This is where private investigators come in.

    Private investigators, also known as PIs, offer a wide range of services, including finding missing persons, tracking marital infidelity, investigating theft, running background checks, verifying insurance claims, and collecting debts on behalf of their clients.

    PIs work on any case requiring extensive research and investigation. Their duties range from gathering vital facts and connecting clues to providing conclusive information regarding the case.
  • What is a private investigator?

    Private investigators are experienced individuals hired to carry out detective work. They are fact-finding experts who dedicate time and effort to gather evidence and reveal information that would be difficult to gain through ordinary means. Private investigators can either operate alone or work for an agency.

  • Are private detectives real?

    Yes, private investigators are real. They provide their expertise to anyone who needs an in-depth investigation for an important matter. Whether tracking a long-lost loved one, running background checks, finding missing persons, or conducting general research, private detectives operate with discretion and rarely make the news.

  • What do private investigators do?

    PI work involves a lot of information gathering and fact analysis. Their field assignments involve carefully following persons of interest, conducting surveillance, interviewing people, and, sometimes, going undercover to get more information. They use GPS tracking devices, video recorders, computers, and other technology to collect information.

  • How do private investigators work?

    Private investigators’ ability to conduct examinations and close cases without their targets knowing their involvement makes them very effective. A PI firm may have different personnel, each specializing in a particular field. From computer experts to web-data analysts and field officers, these agents work together to solve cases or complete an objective.

  • What is a private investigator allowed to do?

    PIs are civilians, so they're required to operate within the confines of the law. Private investigators search multiple online databases, public records, and open source files to collect information. However, they cannot bug phones or hack into online accounts to acquire protected information. They can conduct surveillance on people in public places, but they can't trespass into their homes or property.