Stop first if you see these warning signs
If your electrical panel is warm, buzzing, sparking, smells like burning plastic, or has scorch marks, do not touch it. Leave the area and call your utility or an emergency electrician right away. The Consumer Product Safety Commission (CPSC) treats these as signs of a dangerous panel, not a DIY project.
An electrical panel upgrade means replacing your home’s main breaker box or fuse box with one that has more capacity or safer components. You typically need one when your current panel is too small for your home’s power needs, uses outdated fuses, or shows signs of wear. Costs and permit rules depend on where you live, so this guide focuses on the signs, the safety limits, and the questions to ask a licensed electrician.
What an electrical panel actually does
The panel is the control center for your home’s electricity. Power comes in from the utility line, and the panel splits it into individual circuits for rooms, appliances, and outlets. Each circuit has a breaker or fuse that shuts off power if it senses too much current, which helps prevent overheated wires and fires.
Panels are rated by amperage, such as 100 amps or 200 amps. Older homes often have smaller panels that were sized for the appliances of their era, not today’s electronics, HVAC systems, and electric vehicle chargers.
Signs you may need a panel upgrade
None of these signs confirm you need an upgrade on their own. They’re reasons to have a licensed electrician evaluate your panel.
- Frequent breaker trips or blown fuses, especially when running normal appliances
- Flickering or dimming lights when other devices turn on
- A fuse box instead of circuit breakers, common in older homes built before breaker panels became standard
- A panel rated under 100 amps in a home with central air conditioning, electric heat, or an electric range
- Warm switch plates or outlets, discoloration, or a persistent burning smell
- Reliance on extension cords or power strips because there aren’t enough circuits
- Visible rust, double-tapped breakers, or a panel model that’s been recalled
- A major addition planned, such as an EV charger, a home addition, a hot tub, or a workshop
What typically triggers an upgrade
A panel upgrade usually comes up during one of these situations:
- Adding a large new load. EV chargers, hot tubs, and electric heat pumps often need more capacity than an older panel can supply.
- A remodel or addition. New rooms and circuits can push a small panel past its limit.
- An insurance or lending requirement. Some insurers and mortgage lenders flag older fuse panels or specific brands with known defect histories during underwriting.
- A home inspection finding. Buying or selling a home often surfaces panel age or condition issues.
- Ongoing electrical problems. Ruling out a failing panel after repeated tripped breakers or flickering lights.
Why this is licensed-electrician work
Panel work involves the main service connection, which stays energized even when individual breakers are off. Mistakes here can cause shock, arc flash, or fire. This site does not provide step-by-step instructions for panel replacement or any work inside the panel enclosure. Read the site’s Home Project Safety Disclaimer for the full list of jobs that call for a qualified professional.
A qualified, licensed electrician will typically:
- Calculate your home’s actual electrical load before recommending a panel size
- Coordinate with your utility to disconnect and reconnect service safely
- Pull the required permit and schedule inspections
- Verify grounding and bonding meet current code
- Label the new panel clearly
Cost factors to expect
Panel upgrade costs vary by region, panel size, home age, and how much rewiring is needed, so this guide can’t give you a single price. Instead, use this list to understand what drives the quote you’ll receive:
- Amperage increase. Jumping from 100 to 200 amps typically costs more than a smaller increase.
- Utility coordination. Some utilities charge fees or require a service upgrade alongside the panel.
- Permit and inspection fees. Set by your local building department.
- Panel location and access. Moving a panel or running new conduit adds labor.
- Code updates needed. Older homes may need grounding, bonding, or AFCI/GFCI upgrades to pass inspection.
- Number of circuits being added. More new circuits mean more materials and labor.
Ask each electrician for a written, itemized quote so you can compare what’s actually included, not just the bottom-line number.
Permits and code: always local
Nearly every jurisdiction requires a permit and inspection for a panel upgrade because it affects the entire home’s electrical safety. Permit rules, required inspections, and code editions vary by city and county. Before work starts, verify requirements with your local building department, and confirm your contractor’s license and insurance with your state’s licensing board.
Questions to ask before you hire
- Are you licensed and insured in this state, and can I see current documentation?
- Will you pull the permit yourself, and is that included in the quote?
- What amperage are you recommending, and what load calculation supports it?
- Will this require a utility shutoff, and how long will power be off?
- What happens if you find additional problems once the panel is open?
For more questions to compare contractors on scope, insurance, and change orders, see this site’s hiring guidance for home projects.
Decision path
- Notice a warning sign? If it’s sparking, burning smell, or heat at the panel, stop and call your utility or an emergency electrician now.
- Noticing tripped breakers or flickering lights? Schedule a licensed electrician to inspect and do a load calculation.
- Planning a big new load (EV charger, addition, hot tub)? Get a load calculation before you buy equipment, so you know if a panel upgrade is required.
- Buying or selling a home with an older panel? Ask for a panel inspection as part of the home inspection.
- Ready to hire? Get at least two written quotes, verify licensing, and confirm permit and inspection steps with your local building department.
Cost and evidence limits
This article does not include specific dollar figures, timelines, or brand recommendations because those depend on your location, your home’s condition, and your utility. It also does not describe how to open, inspect, or work inside a panel. That work should only be done by a licensed electrician following current code and manufacturer instructions.
FAQs
Can I just add a sub-panel instead of upgrading the main panel?
Sometimes. A sub-panel can add circuits without replacing the main panel, but it doesn’t fix an undersized main service. A licensed electrician can tell you which option fits your situation after a load calculation.
Is a 100-amp panel automatically unsafe?
Not automatically. Many homes run safely on 100 amps. The concern is whether the panel can handle your actual electrical load, its condition, and whether it uses safe, non-recalled components. An electrician can evaluate this directly.
Do I need a permit for a panel upgrade?
In most areas, yes, because it affects the main electrical service. Permit and inspection requirements vary by city and county, so confirm with your local building department before work begins.
How long does a panel upgrade take?
Timelines depend on utility scheduling, permit processing, and the scope of work, and this varies by location and contractor availability. Ask your electrician for a project-specific estimate in writing.
Safety disclaimer
This article is for general education only. It is not an inspection of your home, and it is not electrical, engineering, or legal advice. Electrical panels involve shock, arc-flash, and fire risks. Always use a licensed electrician for panel evaluation and replacement, and verify permit, code, and inspection requirements with your local building department before work begins. See the full Home Project Safety Disclaimer and this site’s Sources and Methodology for how safety and cost claims are verified.