Root Investigations
“She's extremely professional and responsive, but more than that she's just a really kind and sincere person that actually cares about her clients and their issues.”
Best Private Investigators near Brentwood, NY
These agencies serve Brentwood from nearby bases in towns including Melville, West Babylon and Huntington.
15 agencies listed · 4 open 24/7 · 9 open weekends · 13 rated 4.5+ · 8 show a license
Data verified October 18, 2026
Venetiou & Associates
“He gave me peace of mind over all my concerns and went out of his way to help me.”
Joseph Cornetta Investigations
“Joe and his team did a fantastic job and were great to work with.”
Dynamic Protection Group
“Dynamic Protection Group is a trustworthy, reliable establishment and are well rounded.”
Long Island Private Investigator
“Thank you so much Chad for your help, your professionalism and efficiency are greatly appreciated.”
Viceroy Investigations & Consulting
“I highly recommend them to anyone looking for excellent service!”
The 15 agencies on this page are the private investigators listed for Brentwood, NY. What each one states about its license, its specialties and the areas it covers comes from its own website; ratings and quotes come from public reviews.
Area overview: Brentwood, NY
14 of the 15 agencies on this page have a rating, from 4.3 to 5.0 across 156 reviews; 13 are rated 4.5 or higher. 4 are open around the clock and 9 are open on weekends. 8 show a license on their websites and 1 has a BBB rating of A or A+. Domain records put 10 websites of the agencies on this page at ten or more years old; the oldest dates from 2004. 4 offer urgent consultations; 1 offers remote or virtual consultations; 3 offer a free initial consultation and 1 lists coupons or special offers. We have a website on file for all 15 of the agencies on this page; 11 publish a contact page and 12 list a public email. We count these figures across the agencies on this page; hours and prices change, so confirm the details with the agency before you book.
Do investigators listed for Brentwood discuss a case free?
3 of the 15 agencies state that a first consultation costs nothing. Use it to describe the problem and hear whether the work can be done lawfully at all. A straight agency will sometimes tell you on that call that what you want cannot be obtained, which saves you a retainer.
Global Intelligence Associates
“These people are at the top of their game.”
Paul J Larkin Associates
The County Wide Group
“Came here for an employment drug screen.”
Vanson Investigations
All Private Investigations
“I contacted Ken to investigate and find information on a very old and complex matter that required a high level of effort and specific skills.”
Professional Intelligence Agency
“Not only the best in the business, but the only one you will ever need.”
Hold That Scene- Investigations and Security
“They have done an amazing job providing security.”
New York's Finest Private Investigative Services
Advantage Investigations
Why these companies made our list
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