An Arkansas contractor taking work in Georgia deals with the same four questions everywhere: who licenses the trade, when a licence is actually required, when workers compensation kicks in, and where the business registers. Below is Georgia's answer to each, with the agency's own link.
Licensing
State Licensing Board for Residential and Commercial General Contractors (Georgia Secretary of State Licensing Division)
Residential and general contractor licenses required when total work value exceeds $2,500 (O.C.G.A. 43-41). Electrical, plumbing, conditioned-air, low-voltage, and utility trades are licensed separately by the State Construction Industry Licensing Board's five divisions.
https://sos.ga.gov/state-licensing-board-residential-and-commercial-general-contractors
Workers compensation
Georgia State Board of Workers' Compensation
Employers regularly employing three or more persons, including regular part-time workers, must provide workers' compensation benefits.
https://sbwc.georgia.gov/frequently-asked-questions/workers-compensation-insurance-faqs
Tax registration
Georgia Department of Revenue
New hire reporting
Most states require newly hired employees to be reported within a short window of their start date.
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Starting or running the business itself is covered in the contractor business guide. Arkansas licence records for Benton and Washington counties are in the contractor directory.