Vanguard Intelligence & Security Group
“Very professional patients and understanding scary to have to use a company but it was well worth it good job”
Best Private Investigators near Brookfield, WI
These agencies serve Brookfield from nearby bases in towns including Milwaukee, West Allis and Waukesha.
10 agencies listed · 2 open 24/7 · 6 open weekends · all 10 rated 4.5+ · 3 show a license
Data verified October 24, 2026
Advanced Surveillance Group
L. Johns Services
“Doing business with his company gained me and my husband Custody of my stepson and we live In Illinois.”
Third Coast Investigations
“Once I went with third coast the results were phenomenal in would suggest these guys to anyone!”
Barber Investigations
“Jason's expertise provided crucial evidence in my case that resulted in my case being dismissed.”
Elite Protection Specialists
“24 hours later DONE ✅ Used them again for a hard to locate individual, again just over 24 hours, served 👏 Very professional, and reasonable.”
The 10 agencies on this page are the private investigators listed for Brookfield, WI. 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: Brookfield, WI
The 10 agencies on this page are rated from 4.6 to 5.0 across 51 reviews. 2 are open around the clock; 6 are open on Saturdays and 4 on Sundays. 3 show a license on their websites. Domain records put 5 websites of the agencies on this page at ten or more years old; the oldest dates from 2004. 2 offer urgent consultations and 2 offer a free initial consultation. We have a website on file for 9 of the agencies on this page; 7 publish a contact page and 7 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 Brookfield discuss a case free?
2 of the 10 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.
Private Investigation
KM Investigations and Security
“Kevin helped me out and was very professional.”
Midwest Private Police Agency INC
Investigative Resources
“I reached out to Investigative Resources for assistance in confirming where a person resides to be served and Tim provided excellent results and in a timely manner.”
Why these companies made our list
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