Electrical panel and service upgrades: signs, steps and timing
Updated October 24, 2026
In short
If breakers trip often, you still have fuses, or you are adding an EV charger, heat pump or new kitchen, check your panel and service size first. A panel swap is often done in a day; a service upgrade also depends on the utility's schedule.
Signs it's time
- Breakers trip or fuses blow when appliances run together
- The panel feels warm, buzzes or shows rust or scorch marks
- You have 60 or 100 amp service and plan to add big loads
- An older panel brand that inspectors and insurers flag
- Too few spaces for new circuits
Panel swap or service upgrade?
A panel replacement keeps the same service size and replaces the breaker box. A service upgrade, for example from 100 to 200 amps, also changes the wires from the utility, the meter equipment and often the grounding.
A load calculation tells you which one you need. It adds up what you have and what you plan to add.
The steps
- Site visit and load calculation
- Written estimate
- Electrical permit filed by a licensed master electrician
- Utility application for service upgrades (Con Edison or PSEG Long Island)
- Installation, usually with a short power shutdown
- Inspection and, for service upgrades, utility reconnection
Timing
A straight panel replacement is often finished in one day once the permit is in place. Service upgrades take longer because the utility has to schedule its part, which can take weeks. Plan ahead if you are adding an EV charger or heat pump.
Questions
Will I lose power during the work?
Yes, for part of the day. We plan the shutdown with you and restore power the same day for most panel jobs.
Do I need a permit to replace a panel?
Yes. Panel and service work needs an electrical permit and an inspection in NYC and on Long Island.
General information, not legal or engineering advice. Rules change and every building is different. Check with the Department of Buildings, your town or your building management.