Adding or replacing a subpanel can require review of the feeder, overcurrent protection, grounding, panel location and the capacity of the existing main service. The project should be described as a subpanel scope rather than a generic panel replacement.
This guide helps you describe the project accurately. It does not replace a City determination about whether a permit, plan review, inspection or professional document is required.
The exact permit requirement depends on the work, property and current City rules. Use the scope questions on this page and confirm the requirement with the responsible building department.
This guide links to the configured Rancho Santa Margarita electrical panel upgrade workflow because it is the closest supported project category. If your exact scope requires additional forms, plans or review, the City remains the authority.