How to Start a Private Investigator Business: License First

Start by confirming what your state requires before it licenses an investigator or an agency. Then apply, post any required bond or insurance, register the business, insure the work, and build a referral plan. The license rules decide how to structure the company, so settle them first.

Each of these four states requires verified investigative work before a license, but the amount, the substitutes and the entry routes differ. These are the rules as of October 2026.

Our arithmetic on the 6,000-hour states: 6,000 hours divided by 2,000 hours a year (40 hours a week for 50 weeks) is three years of full-time work. Part-time work takes longer. Because the rules differ this much, check your own state's board before anything else.

Not as an independent investigator in a state that requires hours. In those states you earn the hours first and open the business after. California's Business and Professions Code §7520 provides that no person may engage in the regulated business, or act or represent themselves as a licensee, unless licensed. Because most states license the work (Bureau of Labor Statistics), assume the same rule applies in yours until your board tells you otherwise.

A police background is not the only way in. Minnesota counts hours from licensed private detective agencies, government investigative services and equivalent occupations, so a career changer can build qualifying hours as an employee of a licensed agency. In Florida the Class CC intern license is a defined route from zero experience.

Training helps you work well during those hours, but it does not replace them. Our recommendation is to spend the waiting period on skills that make you hireable: report writing, evidence handling and the law. Our guide to writing investigation reports that hold up covers the first. Our self-paced Legal Aspects of Private Investigation course covers criminal law, evidence categories, defenses to criminal prosecution, rules of evidence and court procedures. It costs $120 as of October 2026. The course page lists the states in which it is approved; confirm with your own board before you rely on it for any state requirement, using our guide to whether a private investigator course counts in your state.

State license fees listed as of October 2026 total $789.75 for a Florida agency with its manager and $1,900 for a Minnesota LLC. Insurance, bond premium, entity filing and equipment come on top, and each needs its own quote. Our private investigator training cost calculator lets you add your own state's fees.

How the Florida figure is built, from the Division of Licensing fee schedule: Class A is a $50 application fee plus $42 fingerprint processing plus a $450 license fee, which is $542. Class MA is $50 plus $42 plus a $10.75 fingerprint retention fee plus a $75 license fee, which is $177.75. The $70 exam is paid to the testing contractor. A Class A agency needs a Class MA manager unless it designates a Class C or Class M licensee (Florida Department of Agriculture and Consumer Services). The schedule waives the initial application or license fee for veterans who apply within 24 months of discharge for classes including C and MA. This total is our sum of the published fees, not an official quote.

Minnesota charges $1,000 for an individual private detective license, as of October 2026, and renewals every two years cost $540 to $1,220 depending on staff size. The Minnesota board's application packet may add items the fee page does not break out, so ask the board for the full list.

Costs outside those totals, which you quote individually:

• Bond premium. Minnesota requires a $10,000 bond or an allowed alternative. You pay a surety company a premium it quotes.
• Liability insurance. E&O (errors and omissions) insurance covers professional mistakes, such as a wrong fact in a report. Get quotes from a US broker that writes investigator coverage. Coverage limits vary by tier: as of October 2026, NEXT lists a Basic tier with $500,000 general liability and $250,000 E&O, and a Pro tier with $1 million of each, with premiums by quote. Ask any broker about invasion-of-privacy and defamation claims, and whether your personal auto policy covers driving during surveillance.
• Entity filing and equipment. Your state's LLC filing fee, a camera, a computer and a records system.

No reliable public figure exists for owner-investigator earnings, because Bureau of Labor Statistics wage data excludes self-employed workers and owners of unincorporated businesses. The employee median was $51,220 a year ($24.62 an hour) as of May 2025, and employment is projected to grow 5% from 2025 to 2035, against 3% for all occupations (Occupational Outlook Handbook).

Use $51,220 as the salary your business has to beat. Our model for the work required: (target income + annual costs) ÷ your hourly rate = billed hours needed.

Worked example, using $100 an hour as an illustrative rate chosen for the arithmetic, not a market figure, and the $1,900 Minnesota LLC license fee as the only cost: ($51,220 + $1,900) ÷ $100 = 531.2, so 532 billed hours. Against a 2,000-hour working year (the same assumption used above), billed work is 532 ÷ 2,000 = 26.6%, about 27% of the year. The rest goes to marketing, travel, administration and unpaid waiting. Add your own insurance, bond and equipment costs, set your own rate, and rerun it. The model ignores taxes.

New firms struggle because they buy attention when they should earn referrals. One investigator writing in Pursuit Magazine warns that pay-per-click advertising can easily use $500 to $1,000 in a month without a targeted lead when there is no strategy behind it. The same author reports that content marketing took six months to a year to show results. Another investigator's account of closing a first firm stresses asking clients for referrals after each case.

Our recommendation is referrals first: attorneys, insurance professionals and past clients, and you refer to them before you ask for referrals. Run these checks. Each has a pass and a fail.

• Niche test. Write one sentence naming who hires you and for what. Pass: it names a client type and a case type, such as family-law attorneys needing surveillance. Fail: "anyone who needs an investigator."
• Runway test. Add your fixed costs for a month and multiply by six. Pass: you hold that amount in cash. Fail: less. This is our recommendation, based on the six-to-twelve-month lag above.
• Price test. A retainer is an up-front deposit against future hours. Write your hourly rate and retainer. Pass: you can quote both and hold your rate when the caller pushes back. Fail: you cannot state both, or you name a lower figure under pushback. In our view, discounting on the first call signals low value.
• Referral test. Pass: within a week of every closed case you call the client, ask if they were satisfied, and ask for a referral. Fail: you wait for them to offer.
• Spend test. Pass: you have capped paid advertising at an amount you can lose, with a way to link each lead to the ad. Fail: you spend with no tracking.
• Network test. Pass: you belong to a group where attorneys, accountants or insurance brokers meet, and you have made a referral to a member. Fail: your groups contain no one who hires investigators.

Training builds the knowledge you need for the exam and casework, but it never replaces the experience hours or the license. Where a state sets a training rule, such as Florida's 40 hours for a Class CC intern, the course must meet that state's requirements.

We offer self-paced Private Investigator training for people at this stage. If you work toward a Minnesota license, our 12-hour Minnesota Pre-Assignment Course for Private Detectives/Investigators is $185 as of October 2026. A course certificate shows you finished training. Your state board issues the license.

Start with your board's rule, then choose training that fits it. Review the Legal Aspects of Private Investigation course, or call us at (832) 922-1215 or (706) 268-2221, Monday to Friday, 9:00 AM to 6:00 PM Eastern.