What affects the cost to fix a leaking pipe in the ceiling? (Atlanta)

Short answerThe bill usually has separate pieces: finding and reaching the leak, repairing the pipe, any permit, patching the ceiling, and drying anything that got wet. Ask for each one in writing.

What goes into the price

Finding the leak. A supply line leaks whether or not water is in use; a drain leaks only when water goes down it. Telling the plumber which you have can save time. EPA WaterSense's meter check helps you sort it out (EPA WaterSense).
Getting to the pipe. If the pipe is above drywall, the ceiling has to be opened.
The repair itself. A single fitting is a smaller job than replacing a run of old pipe.
Permits. Atlanta's plumbing permit form lists altering piping inside a wall or ceiling, and emergency repair of leaking concealed piping when new pipe exceeds 5 feet (City of Atlanta).
Patching and painting. Many plumbers don't do drywall; ask.
Drying. The EPA says to dry wet areas within 24 to 48 hours to prevent mold (EPA).

What to ask for in the quote

Whether opening and patching the ceiling is included.
Whether a permit is needed and who pulls it.
The master plumber's license, which you can check in the state's licensee search. Georgia's Secretary of State says only licensed master plumbers may run a plumbing business (Georgia Secretary of State).

Insurance

Washington's insurance commissioner says sudden, accidental water damage is often covered, but gradual leaks usually are not (Washington OIC). Call your agent before repairs go beyond stopping the leak. 404 Water Damage covers the restoration side in water damage cost in Atlanta.

Common questions

Who should I call first?

See who to call for a leaking pipe in the ceiling.

Sources

This guide is general information, not legal, insurance or plumbing advice.