Re: After 7 Years of Putting Up a Garage Less Than 20 Feet from the Property Line
If there was a permit issued to build the garage and the county issued a certificate of completion when the construction was done (usually accompanied by an inspection), then usually that would constitute a de facto variance if the garage was later found to violate a setback. The time for the County to have ensured, or required you to adequately ensure setback compliance is when they issued the permit, as a condition of the permit, not 9 years after completion.
I'm a surveyor, not your surveyor & not an attorney.
Advice is general survey, not legal. Hire a local professional for specific advice.