That's a great question. Whether or not a license is required will vary on a number of factors - like the specific work being performed, what type of project is being worked on, and the value of the overall job. Typically, when projects are below a certain threshold, though, licensure won't be required. For more on the specifics of Alabama's licensure rules, there are some resources available online that should help: (1) Alabama General Contractor's License Guide; (2) Alabama Licensing Board; (3) Alabama Contractors License Guide.