It is important to get a written estimate for an electrical project or repair
Any professional, licensed, insured electrician should be able to offer a detailed written estimate or contract.
This contract should detail services to be performed, cost for the services including labor (and equipment, if applicable), and the warranty for the project.
A written estimate is a legally binding contract and is enforceable in a court of law should the work not be completed properly or you have problems after the work is completed, but within the warranty period.
Make certain the written estimate has all the information you need. Be sure that you receive a copy.