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True People Check
“I couldn't find these accounts, which turned out to be very helpful.”
Best Private Investigators near Brentwood, NY
These agencies serve Brentwood from nearby bases in towns including Melville, Smithtown and West Babylon.
24 agencies listed · 9 open 24/7 · 13 open weekends · 21 rated 4.5+ · 11 show a license
Data verified October 18, 2026
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Root Investigations
- Company
- Information
- Knew
“The quick response and reasonable guidance on how things are, what to expect and how to position for success has been incredibly valuable while at the same time making me feel a sense of easy going thru the drama.”
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Dynamic Protection Group
- Team
- Company
- Officers
“Very professional company I am very happy I found them they work with you according to your schedule and are very respectful and pay is always right and on the money probably the best company I've ever worked for”
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Venetiou & Associates
“Chris helped my wife and I track down our wedding videographer and recover footage from our wedding after not being able to get in contact with him for months.”
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Long Island Timely Process Servers
- Choice
- Individual
- Documents
“After speaking with many process servers and got scammed by one of the processors with horrible experience, contacted Thomas and realized he was different from the beginning compared to other process servers.”
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TLO Group
- Legal
- Team
- Company
“Steve and the team were very professional and helpful.”
The 24 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
22 of the 24 agencies on this page have a rating, from 4.3 to 5.0 across 223 reviews; 1 has 50 or more reviews and 21 are rated 4.5 or higher. When clients rate these agencies on specific qualities, they most often praise professionalism (97%), quality (81%) and responsiveness (81%). 9 are open around the clock and 13 are open on weekends. The services the agencies on this page list most often on their websites are background checks (2), private investigations (2) and surveillance (2). 11 show a license on their websites and 2 have a BBB rating of A or A+. Domain records put 16 websites of the agencies on this page at ten or more years old; the oldest dates from 1999. 9 offer urgent consultations; 1 offers remote or virtual consultations; 3 offer a free initial consultation and 2 list coupons or special offers. We have a website on file for all 24 of the agencies on this page; 18 publish a contact page and 20 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 24 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.
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M.C. Investigators
- Results
- Company
- Communication
“Great services highly recommended, thanks again Michael for your services truly satisfied I've already referred his business to those in need, I vouch for his good work”
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All Private Investigations
- Company
“From the beginning of my request to the end, I was informed of every detail of how my situation would be handled with courtesy as well as concise information.”
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Long Island Private Investigator
“Thanks Long Island PI.”
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Joseph Cornetta Investigations
- Compassionate
- Criminal
- Skilled
“I am a 62 year old man who has been through different situations, and I will tell you that Joe Cornetta and his colleagues are the people you want to be working with when the going gets tough.”
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Viceroy Investigations & Consulting
“I highly recommend them to anyone looking for excellent service!”
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George Scheld Investigations
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Absolute Private Investigations
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Hold That Scene- Investigations and Security
- Company
“Polite employees and fast communication”
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Paul J Larkin Associates
“5 stars all thexway”
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Global Intelligence Associates
“These people are at the top of their game.”
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The County Wide Group
“Quick service and nice people!”
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Shark Investigations & Security
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Vanson Investigations
“I c u 2”
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Osborne Investigation Corp.
“I've dealt with Investigators before, but this Investigator was the Best I ever hired.”
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Sutton Associates
- System
- Team
- Questions
“Going up against all odds and a very difficult client mr Murphy used his highly trained people as well as the firms many resources to establish a well planned and cleverly crafted memorandum in support of political corruption.”
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New York's Finest Private Investigative Services
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Professional Intelligence Agency
“Not only the best in the business, but the only one you will ever need.”
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Advantage Investigations
Private Detective Services in Brentwood, NY Cost Estimates
Minimum cost
$325
Maximum cost
$10290
National Average
$1300
Avg Per Hour Rates
$136
$759
$2167
Average price range is based on 265 cost profiles
Why these companies made our list
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