How to Prepare for an Electrical Service Upgrade: Step-by-Step

To prepare for an electrical service upgrade, review your panel capacity, hire a licensed electrician, secure all permits, clear work areas, plan for a 4-8 hour power outage, and save all final documentation.

A service upgrade, usually a panel replacement from 100 to 200 amps, increases capacity, removes outdated equipment, and ensures compliance with NEC standards. Without preparation, you risk delays and extra costs. This article explains each step.

Key Takeaways

• Most Prescott homes built before 1990 have 60-amp or 100-amp service. A modern household needs a minimum of 150 to 200 amps.
• In Arizona, any service upgrade requires a licensed electrician and a permit. The permit triggers a mandatory inspection.
• The utility company must disconnect and reconnect power at the meter. That coordination adds time to the project schedule.
• Clearing access to the panel, meter, and work areas before day one reduces job time and electrician cost.
• Plan for 4 to 8 hours without power on the day of the upgrade. Larger or more complex upgrades may require two days.
• Keep all permits, inspection records, and invoices. These documents directly affect your home’s resale value and insurability.
• A service upgrade is the right time to also add GFCI protection, surge protection, and any new circuits you have been delaying.

Why Homeowners Upgrade Their Electrical Service

Your Panel Cannot Handle Modern Load

A 100-amp panel was adequate in a home with a few appliances and no central air. It is not adequate for a home running central HVAC, an electric range, a clothes dryer, a home office, EV charging, and a full suite of electronics at the same time. Running at or near capacity stresses every component in the panel. Review electrical panel sizes for your home to calculate whether your current service matches your actual load.

You Are Adding a High-Demand Appliance or Circuit

EV chargers, hot tubs, whole-home generators, and central AC units all require dedicated circuits with specific amperage. Many of these cannot be added to an older 100-amp panel without overloading it. A service upgrade to 200 amps creates the headroom those additions require.

Your Panel Brand Is a Safety Risk

Federal Pacific Stab-Lok and Zinsco panels are known to fail under fault conditions, meaning their breakers may not trip when they should. Replacement is the recommended action regardless of how the panel currently appears to perform. Read electrical panel overheating signs to understand what a failing panel looks like in practice.

You Are Renovating or Adding Space

Any renovation that adds rooms, converts a garage, or includes a detached structure typically requires a panel evaluation. Scheduling your electrical remodeling services alongside the upgrade is more cost-efficient than doing it separately.

How to Prepare for an Electrical Service Upgrade: Every Step

Step 1. Assess Your Current Panel and Load

If your main breaker is 60 or 100 amps and you use central air plus large appliances, you likely need an upgrade. This tells your electrician where to start.

Step 2. Identify Everything You Want to Add While the Electrician Is There

Add other needed work now for efficiency. Compile a written list for your first electrician meeting.

Common additions worth considering at the same time:

• Whole-home surge protection is especially relevant during Prescott’s monsoon season.
• GFCI outlet installation in kitchens, bathrooms, and garages
• Additional outlets in rooms where you rely on extension cords

Step 3. Hire a Licensed Arizona Electrician

Request the electrician’s license number and proof of insurance. Obtain a written, itemized estimate covering permits and timeline. Avoid offers to skip permits.

Step 4. Confirm the Permit Is Pulled Before Work Starts

Confirm the permit is approved before work starts. Unpermitted work in Arizona is usually not retroactively approved.

Step 5. Coordinate the Utility Disconnect

APS or UniSource must disconnect power before work and reconnect after inspection. Utilities need 3–10 business days’ notice. Ask your electrician when they schedule this.

Step 6. Clear Access to the Panel, Meter, and Work Areas

Before the crew arrives, clear furniture and storage from panel, meter, and wiring areas so the electrician has direct access.

Step 7. Plan for the Power Outage

Panel upgrades last 4–8 hours. Charge devices in advance, prep food, alert everyone to the outage, and consult your electrician about backup generators.

Step 8. Be Present for the Final Walkthrough

Join the walkthrough. Ensure circuits are labeled, test outlets, and ask for a system rundown before the electrician leaves.

Step 9. Pass the Inspection and Keep All Records

After the work is complete, the city or county inspector verifies that it meets code. Once the inspection passes, the utility company reconnects service. Keep the inspection report, the permit, all invoices, and any warranty information in a dedicated file. According to the National Association of Realtors, documented electrical upgrades that pass inspection consistently rank among the top issues buyers’ inspectors flag during escrow. A home with a fresh 200-amp service upgrade and documented permits removes that flag. The Insurance Information Institute also notes that homes with updated electrical systems frequently qualify for lower homeowner’s insurance premiums.

Preparation Checklist

Assess panel capacity and load	Before hiring an electrician
Make a written list of additional work	Before your first estimate
Confirm license and insurance	Before signing a contract
Confirm the permit is pulled	Before day one of work
Verify utility disconnect is scheduled	At least 3 to 10 business days out
Clear panel, meter, and work areas	The day before the upgrade
Charge devices and prepare for an outage	The evening before
Be present for the final walkthrough	Day of the upgrade
File all permits and inspection records	Immediately after passing inspection

Ready to Move Forward?

Assurance Electrical Services handles panel upgrades, permits, and utility coordination for homeowners in Prescott and the surrounding area. If you are ready to move forward or want an honest assessment of what your home needs, contact us here, and we will walk you through it from the first step.

Frequently Asked Questions

What is an electrical service upgrade?

An electrical service upgrade replaces your home’s main panel, service entrance wiring, and meter base to increase the total amperage your home can draw from the utility grid, most commonly from 100 amps to 200 amps. The work includes new service entrance cable from the meter to the panel, a new meter base in many cases, and a new main breaker panel with fresh circuit slots.

How long does an electrical service upgrade take?

Most standard panel upgrades take 4 to 8 hours of active work. Add 3 to 10 business days for the utility disconnect scheduling, and 1 to 5 business days for the post-work inspection appointment. From the time you hire your electrician to the day power is reconnected, the full process typically takes 2 to 3 weeks.

Do I need to be home during the electrical service upgrade?

You do not need to be present for every hour of the work, but you should be available at the start and for the final walkthrough. Being present at the end lets you confirm labeling, test outlets, and ask your electrician to explain the new system before they leave.

Will an electrical service upgrade increase my home’s value?

Yes. A 200-amp panel with a clean inspection record increases resale appeal, can lower your homeowner’s insurance premium, and is often required by buyers’ home inspectors before the close of escrow on older homes. Documented permits and a passing inspection remove that flag for buyers.