Breaker Box Replacement/Upgrade
More than likely, you'll need a permit. The power company will have to disconnect the power for the panel change out and in most cases won't reconnect when the job's done unless they get an OK from the local AHJ. I've known local electricians that have pulled the meters without power company notice and have done the work. The problem is with the smart meters, the power company knows the meter was pulled and will notify the AHJ. Then it gets inspected, the owner or electrician has to get the permit and penalties are added and the owner might now have to get the meter can and riser upgraded. Check with the local guys first... this can really get hairy if you try for the shortcut.