An electrical panel upgrade involves more than replacing an old breaker box. The electrician must assess your existing electrical system, determine the capacity your property needs, coordinate permits and utility work when required, install the new equipment, and verify that the system operates safely.
If you are planning an electrical panel upgrade for your home or business, understanding each step can help you prepare for the temporary power outage, inspection requirements, project timeline, and potential additional work.
In this guide, Baldr Electric explains what happens during an electrical panel upgrade, from the initial inspection to the final testing.
What Is an Electrical Panel Upgrade?
An electrical panel distributes electricity from your utility service to the circuits throughout your property. Circuit breakers help protect those circuits when an overload or other electrical fault occurs.
An electrical panel upgrade may involve replacing an outdated panel, increasing the available electrical capacity, modifying circuits, or upgrading associated service equipment. The exact work depends on the condition of the existing system and the property’s electrical requirements.
A panel replacement does not automatically increase the amount of electricity available to your home. If additional capacity is needed, the electrician must evaluate the service equipment and determine whether a larger service or other electrical modifications are necessary.
Step 1: Inspecting the Existing Electrical Panel
The first step is an assessment of your current electrical system. The electrician examines the electrical panel, breakers, wiring connections, service equipment, and other relevant components to identify existing problems and determine the appropriate scope of work.
During this inspection, the electrician may look for:
- Frequently tripping circuit breakers.
- Visible corrosion, damaged wiring, or signs of overheating.
- An outdated or damaged electrical panel.
- Insufficient space for additional circuits.
- Electrical capacity concerns related to new appliances or equipment.
The electrician also discusses your plans for the property, such as adding an electric vehicle charger, heat pump, air conditioning system, or other high-demand equipment.
This assessment helps determine whether you need a panel replacement, additional circuits, a service upgrade, or another electrical repair.
Step 2: Calculating Electrical Load and Planning the Upgrade
After inspecting the existing equipment, the electrician evaluates your property’s electrical demand. This may include a load calculation based on existing appliances, heating and cooling equipment, lighting, and planned additions.
For example, a homeowner installing an EV charger may need to determine whether the existing electrical service can support the additional load.
Depending on the assessment, the project may involve a 100-amp, 150-amp, or 200-amp panel or service configuration. The appropriate choice depends on the calculated load, existing service capacity, equipment specifications, and applicable electrical requirements.
The electrician then explains the proposed work, expected timeline, estimated cost, and any additional upgrades that may be necessary.
Step 3: Obtaining Permits and Coordinating Utility Work
Electrical panel upgrades commonly require permits and inspections, although the exact requirements depend on the jurisdiction and project scope.
Before work begins, the electrician or property owner must confirm the applicable requirements with the local building department. Utility coordination may also be necessary if the project involves service conductors, a meter, or other utility-controlled equipment.
In New Hampshire, electrical work must comply with the applicable state and local requirements. Property owners can consult their local building department for permit and inspection procedures.
Planning these arrangements in advance helps reduce delays and clarifies which approvals are required before the project can be completed.
Step 4: Preparing the Property and Shutting Off Power
Before the existing panel is removed, the work area must be prepared and the electrical supply safely disconnected as required for the job.
The electrician coordinates the power shutoff and any necessary utility disconnection. During this period, circuits supplied by the affected equipment will be unavailable.
Before installation day, homeowners should consider:
- Charging phones, laptops, and other essential devices.
- Keeping refrigerated and frozen food in mind during the outage.
- Planning for heating, cooling, and other equipment that depends on electricity.
- Arranging alternative accommodations if the expected outage creates a particular concern.
The outage duration depends on the complexity of the installation, the condition of the existing wiring, and the required inspections or utility work.
Step 5: Removing the Existing Electrical Panel
Once the system has been safely disconnected, the electrician removes the old panel and prepares the installation area for the replacement equipment.
During removal, the electrician checks the condition of the wiring, conductors, mounting area, and relevant grounding and bonding components. If damaged or unsuitable equipment is discovered, additional repairs may be needed before the installation can proceed.
The electrician must also identify the existing circuits so they can be reconnected appropriately. Any additional work should be explained before it changes the agreed project scope.
Removing the old panel carefully helps prepare the electrical system for the new equipment and any necessary corrections.
Step 6: Installing the New Electrical Panel
The electrician mounts the new panel and installs compatible breakers and other required components. Existing branch circuits are reconnected according to the installation requirements, and circuit labels are updated so occupants can identify the circuits more easily.
Depending on the project, the work may also involve:
- Replacing or modifying service conductors.
- Updating grounding and bonding components.
- Adding or modifying branch circuits.
- Addressing wiring or equipment issues identified during inspection.
- Coordinating a service-capacity increase when required.
For a project that increases the electrical service capacity, replacing the panel alone may not be sufficient. The service conductors, meter equipment, and other components must be evaluated to determine whether they can support the proposed configuration.
The installation must follow the applicable electrical code, equipment instructions, and permit requirements.
Step 7: Completing the Required Inspection
Once the installation is ready, the required inspection is arranged through the appropriate local authority or authorized inspector.
The inspection process may involve checking the installation, electrical connections, grounding and bonding, breaker ratings, and other applicable safety requirements.
If the inspector identifies deficiencies, corrections may be necessary before approval is granted. The exact process depends on local procedures and the scope of work.
The electrician should explain the inspection outcome and any outstanding requirements before the project is considered complete.
Step 8: Restoring Power and Testing the System
After the necessary approvals and utility coordination are completed, power can be restored according to the applicable procedures.
The electrician then checks the installation and verifies that the affected circuits operate as intended. This may include checking breaker operation, circuit identification, and the function of connected equipment.
Before the work is finished, ask the electrician to explain the new panel layout, identify important breakers, and clarify any operating instructions relevant to your installation.
Keep the documentation provided for the project, including applicable permits, inspection records, and equipment information.
How Long Does an Electrical Panel Upgrade Take?
The installation time depends on the existing electrical system and the scope of work. A straightforward residential replacement may be completed within a working day, while projects involving service-capacity increases, extensive wiring repairs, or additional equipment can take longer.
The overall timeline may also include permit processing, utility scheduling, and inspection appointments. These activities do not necessarily occur on the same day as the physical installation.
Ask your electrician for a project-specific timeline that distinguishes the expected installation period from the time needed for approvals and coordination.
What Affects the Cost of an Electrical Panel Upgrade?
The cost of an electrical panel upgrade depends on the equipment, labor, existing conditions, and any additional work required.
Factors that may affect the estimate include:
- Panel size and equipment: The specifications and capacity of the replacement equipment.
- Service upgrades: Whether service conductors, meter equipment, or related components need replacement.
- Wiring repairs: Whether existing wiring or connections require correction.
- Permits and inspections: Applicable local fees and project requirements.
- Installation complexity: Accessibility, circuit modifications, and other site-specific conditions.
A panel replacement and a complete electrical service upgrade are not necessarily the same project. Request an itemized estimate that explains what is included and identifies potential additional costs.
For an accurate estimate, an electrician should assess your existing system rather than relying on a general online price range.
Frequently Asked Questions
Do I need a permit for an electrical panel upgrade?
A permit is commonly required for electrical panel and service upgrades. Requirements vary by jurisdiction, so confirm the applicable rules with your local building department before work begins.
Will my power be off during the upgrade?
Yes, the affected electrical supply must be disconnected during the relevant installation work. The duration depends on the project, required inspections, and utility coordination.
Can I upgrade from a 100-amp panel to a 200-amp panel?
Possibly. An electrician must evaluate your electrical demand, existing service equipment, and the requirements for increasing capacity before recommending a suitable upgrade.
Does an electrical panel upgrade include new wiring?
Not necessarily. Some projects involve replacing the panel while retaining suitable existing branch-circuit wiring. Additional wiring work may be required if the inspection identifies damage, deficiencies, or a need for new circuits.
What happens if the electrical inspection fails?
The inspector may identify corrections that must be completed before approval. Your electrician can explain the required work and arrange any necessary follow-up inspection.
How do I know whether I need an electrical panel upgrade?
Frequent breaker trips, visible damage, signs of overheating, or plans to add high-demand equipment may justify an electrical assessment. These symptoms can have different causes, so a panel upgrade should be recommended only after the system has been evaluated.
Schedule an Electrical Panel Upgrade Assessment
Planning an electrical panel upgrade starts with understanding your property’s current electrical system and future power requirements. Knowing what to expect—from the initial inspection and permits to installation and final testing—can help you prepare for the project.
Baldr Electric provides electrical services for residential and commercial properties. If you are considering an electrical panel replacement or need to evaluate your system’s capacity, visit our electrical panel upgrade service page to learn more about our services.
Contact Baldr Electric to discuss your electrical panel upgrade and determine the next steps for your property.
