CityvettedDo you actually need a panel upgrade? A homeowner's guide
When 100 amps is plenty, when it isn't, and how to tell whether the upsell is safety or sales.
An electrician walks through your house, glances at your panel, and says you need to upgrade to 200 amps. The number on the quote is $2,500 to $4,000. Maybe you do need it. Maybe you do not, and a panel upgrade is one of the more profitable jobs an electrician can sell, which means the recommendation is not always pure. Here is how to tell whether your 100-amp panel is genuinely maxed out or whether someone just spotted an easy sale walking through your living room.
- For many homes without major electric loads, 100 amps is genuinely enough.
- The real triggers for an upgrade: EV charger, electric heat pump, electric range plus dryer, or a big addition.
- A full panel of breakers does not mean a maxed-out panel. Those are different things.
- Some "upgrades" are really safety fixes for a hazardous panel brand. Know which is which.
When 100 amps is plenty
A 100-amp service can comfortably run a typical home: lights, outlets, refrigerator, a gas furnace and gas water heater, a window or modest central AC, computers, and the usual kitchen appliances. Millions of houses run happily on 100 amps and will keep doing so for decades. If your loads are mostly gas and your electric demands are ordinary, the panel is not your problem, and an upgrade is a solution looking for a job.
The math behind this is a load calculation, the same idea as sizing an air conditioner. An electrician adds up your actual and potential electrical demand and compares it to your service capacity. If your calculated load is well under 100 amps, you have headroom. Ask to see that calculation. "You need 200 amps" with no math behind it is a sales pitch, not an assessment.
Cityvetted analysis, 2026.
When you genuinely need more
The honest case for an upgrade is electrification. The modern loads that push a 100-amp service past its limit are big and specific. A Level 2 EV charger alone can want 40 to 50 amps. An electric heat pump for heating and cooling is a major draw. Going from gas to an electric range, an electric dryer, and an electric water heater all at once stacks up fast. Add a significant addition with its own HVAC and circuits, and 100 amps runs out of room.
If you are planning two or more of those, an upgrade is not a sales pitch, it is foresight. Doing it once, before you add the EV charger and the heat pump, is cheaper and cleaner than doing it piecemeal. The key word is planning. If you have no such plans, the future-proofing argument is weaker than the salesperson makes it sound.
"A full breaker panel and a maxed-out panel are not the same thing. One means you ran out of slots. The other means you ran out of power. Only the second one needs a new service."
to Daniel Ruiz, Senior EditorThe full-panel misunderstanding
A common upsell leans on a misread: every breaker slot is full, therefore you need a bigger panel. Not necessarily. Running out of physical slots is a capacity-for-circuits problem, not a capacity-for-power problem, and it is often solved far more cheaply with tandem breakers or a small subpanel. That might be a few hundred dollars instead of a few thousand. If an electrician points at a full panel as proof you need a service upgrade, ask whether a subpanel or tandem breakers would solve the actual issue.
When it is safety, not sales
There is one category where the upgrade is not optional and not a scam: certain panel brands are genuine fire hazards. Federal Pacific Electric (FPE) Stab-Lok panels and Zinsco panels have a documented history of breakers that fail to trip during a fault. If you have one of these, replacing it is a safety fix, not a capacity upgrade, and you should take it seriously regardless of your amperage.
- Ask for the load calculation.
Real numbers comparing your demand to your capacity, not a glance and a verdict.
- Check your future loads.
EV charger, heat pump, electric range, big addition? Two or more makes the case real.
- Distinguish slots from power.
A full panel may only need tandem breakers or a subpanel, far cheaper.
- Identify the panel brand.
FPE Stab-Lok or Zinsco is a safety replacement, not an optional upgrade.
- Get a second opinion.
On a $3,000 recommendation, one more electrician's read is cheap insurance.
The question that cuts through it
Ask the electrician directly: "Is this a safety issue, a capacity issue, or future-proofing?" Each answer leads somewhere different. Safety means do it now. Capacity backed by a load calc means do it now. Future-proofing means do it when the future arrives, unless you are about to add the loads anyway. An electrician who can answer that question cleanly is being straight with you. One who blurs the three together is selling.
Cityvetted ranks electricians partly on whether they perform and explain load calculations and whether they distinguish genuine safety issues from optional upgrades. The pros who tell a homeowner "you do not need this yet" are the ones who earn the work when the homeowner does. That restraint is exactly what we look for and exactly what we rank up.