OK, got to jump in here. I’m a PE in 20+ states, but not actively practicing all of them for about 10 years, so, some of this may no longer be correct, but I think it’s close to correct if not exactly correct even today. Here’s the skinny as best I understand, including law and precedent. States license engineers as PE’s and rule on two issues: Use of the title engineer, and, when a license is required. NCEES tried to normalize requirements, the states pushed back, and NCEES became a clearing house for “certified records” but not the requirements themselves which remain the prevue of the states. An NCEES record is helpful because references, transcripts, record of graduation do not need to be recreated for every state application. States recognize each other by comity (not the same as reciprocity; look it up). All states, to my knowledge, now recognize the EIT (did they rename this?) and PE as administered by NCEES, but some (NY for sure, perhaps others) require a higher “passing” test score to become licensed. Once licensed, you can practice in any engineering branch, except that California requires a structural engineering degree and license (and samples of your work) to be licensed to practice structural engineering. In all states, the emphasis is always on being smart enough to know when you are in over your head, and need council from others. This is the way I always responded to reference requests, and junior engineers, with minimal experience that exercised good judgment (including knowing their own limitations) got licensed with no problems. A license is required to practice engineering, when engineering is the service being sold. When engineering is incidental to something else being sold (like a product) a license is NOT required, and the use of TITLE ENGINEER is not regulated. Head spinning yet? Here’s the theory, and a few examples: Provide consulting engineering services, sell only services, a license is required, and the title engineer cannot be used if you are not licensed. In some states, the law requires the owners of an engineering firm must be licensed, especially if the company is a professional corporation, not a business corporation. (Same and sometimes more restrictive rules for Architectural firms, where more than 50% ownership must be a licensed architect, in some states) Work for a car or airplane manufacturer, and your employer is not selling engineering, they are selling cars or airplanes. The legal recourse by the public is product liability law, not professional licensing. The employer may ask for it, but the law does not. Get it? OK, state licensing requirements. About 10 years ago, I had an engineer working for me, and I encouraged him to see if there were any final “eminence in the profession” (30 years experience and age over 50, typical) opportunities left, and he was able to get a license in both New Hampshire and Maine. Each board required samples of work, and an oral exam. He was very capable, and did fine, and was awarded a license in both states. (He indicated he would only practice where he was competent, he told the board I asked him to get a license, I was a reference, and he was approved) I know both states were considering changing their requirements, but don’t know if they have, so, I would suggest looking into both. Also, if you go this route, apply to ALL possible at once, so, on the questionnaire you can answer “no” to the question “have you ever been denied registration in another state” regardless of the outcome of your efforts in one state vs. another. This is a very emotionally charged subject, and I’m not taking sides on that issue here. I’m responding to the original question, and how best to proceed without a degree. I might add I haven’t followed the content of the exams since I took them in the 70’s but would almost guarantee they still include calculus, which would be extremely difficult for someone who didn’t get this math in school. Many licensed engineers use no calculus, so, it would be very difficult to get this skill and experience on the job.