Eleven questions, organized the way a real code review actually runs - zoning first, then the space, then life safety, then utilities. Not a permit determination - a starting point.
This is a rough screen, not a zoning or permit determination. Actual eligibility depends on your specific lot, zone, and jurisdiction's current rules, which change - Accessory dwelling unit rules in particular are actively being revised across DC, Maryland, and Virginia. The honest next step, whatever this says, is a real look at the property.