Panels & Capacity
Electrical Panel Upgrade Guide for Homeowners
The Short Answer
An electrical panel upgrade replaces your home's main breaker panel — and often the service capacity feeding it — so your home can safely handle modern electrical loads. Most homeowners upgrade when they outgrow 100-amp service, add a major appliance like an EV charger or heat pump, or replace an aged or unsafe panel. It is not a DIY job: it involves the utility service, permits, and an inspection, and must be done by a licensed electrician.
Your electrical panel is the heart of your home's wiring. It takes the power coming in from the utility and divides it into the individual circuits that run your lights, outlets, and appliances. Every panel has a fixed capacity, measured in amps, and a fixed number of breaker slots.
Homes built decades ago were wired for a fraction of the electrical load a modern household demands. As families add EV chargers, heat pumps, electric ranges, hot tubs, and home offices, many older panels simply run out of room — or out of safe capacity. That is where a panel upgrade comes in.
What does an electrical panel upgrade actually involve?
A panel upgrade can mean a few different things depending on your home. At its simplest, it is replacing the breaker panel itself. More often, homeowners are upgrading their service capacity at the same time — for example, going from 100-amp to 200-amp service — which involves the meter, the service entrance cable, the main breaker, and coordination with the utility company.
Because the work connects to the utility's equipment, it requires a permit and a municipal inspection, and the power is shut off for part of the day. A licensed electrician handles the permitting, the disconnect and reconnect with the utility, and the inspection sign-off.
What's the difference between 100-amp and 200-amp service?
Amperage is the total amount of electricity your home can draw at one time. In older homes, 100-amp service was standard, and for a small home with gas heat, a gas stove, and modest electrical needs it can still be adequate.
200-amp service is the modern baseline for new construction. It roughly doubles the capacity available, which matters once you start stacking high-demand loads: central air, an electric dryer, an EV charger, and an electric range can quickly exceed what a 100-amp panel can comfortably and safely supply.
What are the signs you need a panel upgrade?
- Breakers trip frequently, even under normal use.
- The panel is physically full, with no open slots for new circuits.
- You rely on power strips and extension cords because you don't have enough outlets.
- You're adding a major load — an EV charger, heat pump, hot tub, or electric range.
- Lights dim or flicker when large appliances cycle on.
- The panel is an obsolete or recalled brand such as Federal Pacific Electric (FPE) or Zinsco.
- You still have a fuse box rather than circuit breakers.
- The panel feels warm, smells of burning plastic, or shows scorch marks.
How does an electrician decide what you need?
Rather than guessing, a licensed electrician performs a load calculation based on the National Electrical Code (NEC). They total up your home's existing demand and the new loads you're planning, then compare that against your service capacity and the condition of your panel, meter, and service cable.
That assessment determines whether you simply need a new panel, a full service upgrade to 200 amps, or in some cases just a sub-panel to add circuits. Our free electrical capacity assessment is a quick first step to see roughly where you stand before scheduling a visit.
Panel upgrade cost ranges
Cost depends on your current service, how far the panel sits from the meter, the condition of your wiring, and local permit fees. The ranges below are general planning estimates — your exact price requires an on-site assessment.
Swapping an aged or unsafe panel without changing service size.
Includes meter, main breaker, and utility coordination.
Adds circuit capacity without a full service upgrade.
Often paired with a service upgrade for older homes.
These are general industry ranges for planning only, not a quote. Actual cost varies by home, accessibility, code requirements, and permit fees. We provide a firm price after an on-site assessment.
Safety considerations
Panel work sits right at the point where utility power enters your home, so the safety stakes are higher than almost any other residential electrical job.
- •The main service conductors stay energized even when the main breaker is off — only the utility can fully de-energize them, which is why this is never a DIY project.
- •Overloaded or undersized panels generate heat, which degrades connections and is a leading cause of electrical fires.
- •Obsolete panels like FPE and Zinsco have a documented history of breakers failing to trip during a fault, leaving the home unprotected.
- •Improper grounding or bonding during a panel swap can leave you vulnerable to shock and surge damage.
- •Work done without a permit and inspection can create insurance and resale problems later.
When to call a licensed electrician
Contact a professional right away if you notice any of the following:
Not sure where you stand? Try our free electrical capacity assessment or call 484-2-SPARKY.
Have a Question About Your Home?
Tell us what's going on and a licensed electrician will point you in the right direction.
Frequently Asked Questions
How long does a panel upgrade take?
Most residential panel or service upgrades are completed in a single day, though the power is off for several hours while the work and utility reconnection happen. Older homes that need additional repairs may take longer.
Do I need a permit to upgrade my electrical panel?
Yes. Panel and service upgrades require a permit and a municipal inspection, and the utility must disconnect and reconnect power. A licensed electrician handles all of this for you.
Will my power be off during the upgrade?
Yes, for part of the day. The electrician coordinates with the utility to disconnect power while the panel is replaced and to restore it once the work passes inspection.
Is 100-amp service enough for my home?
It can be, for a smaller home with gas heat and few high-demand appliances. But once you add an EV charger, electric heat, or an electric range, 100-amp service is usually no longer adequate. A load calculation gives a definitive answer.
Can I add an EV charger without upgrading my panel?
Sometimes. If you already have 200-amp service in good condition and spare capacity, you may not need an upgrade. Homes with 100-amp panels or mostly-electric appliances often do. See our EV charger guide for the full picture.
Related Services
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Service Areas
Our licensed electricians serve the Main Line, Montgomery County, and Lower Bucks County, including:
Wondering if your panel needs an upgrade?
Run our free capacity assessment or talk to a licensed electrician about your panel, your loads, and your options.