Granite City, IL7 Private Detectives near you

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Granite City Private Detectives

Browse these private detectives with great ratings from Thumbtack customers in Granite City.

  • 25 years in business
  • 10 hires on Thumbtack
Deborah C.
Verified review

I can’t say enough about Randy! He was quick to respond and very thorough! Reasonably priced. If you’re ever in need of an investigator he is your guy!

  • 21 years in business
  • 1 hire on Thumbtack
Roy M.
Verified review

Michael is a man with a good eye for detail and compassion for others. His reputation is that of a man who takes life serious and cares for all in need.


We are a full-service private investigation firm, located in the heart of Clayton. You can speak directly to a fully licensed and insured private investigator, 24 hours a day. We personally answer the phones; there are no answering service or recordings. We bring 20 years of investigative experience and unlimited resources and contacts to every case we handle. There is no case that is too big or too small; everything is a top priority. From small claims cases to high-profile cases, we offer the same professional integrity and outstanding service, guaranteed. We also offer the best process server program in the Midwest.


Cornerstone Investigations & Intelligence is a full-service, licensed private investigation firm located downtown in St. Louis, MO specializing in surveillance, investigations, protective services and crisis management.


We are excellent process servers in the Midwest area; we serve all of Illinois, except Cook County area, and all of the State of Missouri. We are licensed and insured, and are licensed within the city of St. Louis. We have been hired by law firms who have hired numerous other private investigators, and have used the local sheriff's offices to locate and serve there most difficult cases. We have assisted various law enforcement agencies in locating fugitives and other wanted persons. We are a dedicated full-time detective agency, 24-7-365.


ICS of Missouri offers a complete array of investigations for Missouri, and has private investigators in every major metro area. Whether your case involves fraud, adultery, missing persons, infidelity or extramarital affairs, child custody, background checks, asset searches, surveillance, process service, or any of our other services, ICS of Missouri can find the resolutions you need, in a professional and discreet manner.

  • 15 years in business

We specialize in surveillance, process service, skip trace, defense and criminal investigations, work compensation, locates, photography, court research, witness interviews, and child abduction and custody investigations.

Q & A

Answers to commonly asked questions from the experts on Thumbtack.

What does a private investigator do?

First and foremost, good private investigators follow laws. Unlike on TV, they don’t break in windows or hack into hospital computer systems to get you intel. When you hire a private investigator, you’re hiring a professional to gather facts and find information for you. Although they can’t obtain certain information (such as health records), they do have access to information that most civilians do not. Often private investigators are hired to perform surveillance or background checks or investigate cases such as adultery, child custody, missing persons, hidden assets, or debugging, and theft or other crimes.

Private investigators can be hired to interview people and provide that information to the client, perform photo or video surveillance, monitor activity at a location where you suspect criminal activities or questionable behavior, track a person’s movements, find missing people, do deep-dive background checks, and more. Private investigation can be helpful if you’re trying to get a court order but need evidence. Private investigators can also help find birth parents. Nationally, the average price range for private investigation is $70-$210 per hour.

What does a private investigator cost?

Private investigation isn’t just for blockbuster action movies. Hiring a private investigator can help in all kinds of situations ranging from finding a birth parent to improving personal security. Nationally, the average price range for private investigation is $70-$210, although pricing often hovers between $40 and $100 depending on the complexity of the services you need. Where you live in the country will affect your costs for private investigation; larger cities have higher business overhead and a higher cost of living, which in turn means higher service rates. The complexity of your case can also affect cost. A basic background check may have a flat rate, while hiring a private investigator to help with your child custody case may require more legwork and research, and therefore cost more. Some private investigators work on retainer. A retainer is essentially a nonrefundable deposit you pay to the professional — meaning you have retained their services — who then works against that amount. Here are some examples of average private investigation costs:

  • Hourly rate: $60-$70; costs can vary based on current fuel prices.
  • Flat rate: $100 for comprehensive background investigation services.
  • Retainer: $1,500 minimum retainer required by some pros before starting work.
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