100A to 200A Panel Upgrade in Connecticut: Cost and Timeline

A 200-amp electrical service upgrade is one of the most common projects West Electric completes in Connecticut. It comes up constantly alongside EV charger installations, solar additions, heat pump conversions, and renovations of older homes. Here is what it costs in Connecticut in 2026, when you actually need one, and how long the process takes from permit to final inspection.

When Do You Actually Need a 200A Upgrade?

Not every home adding modern loads needs a service upgrade. The decision depends on your existing service size and what you are adding:

• If you have 100A service and are adding just one Level 2 EV charger: You may not need an upgrade if your existing loads leave adequate headroom. A licensed electrician should calculate your total load per NEC Article 220. Many 100A homes can accommodate a 32A EV charger (using a 40A breaker) without an upgrade.
• If you have 100A service and are adding solar + EV charger + heat pump in the same project: An upgrade is almost certainly the right call. These three loads together typically exceed what a 100A service can handle safely and code-compliantly.
• If you have 150A service: Often the middle ground. Many 150A homes can host EV charging and solar without an upgrade, but adding a heat pump may tip the balance.
• If you have an older panel brand (Federal Pacific, Zinsco, pushmatic): Replacement is strongly recommended on safety grounds regardless of service size.

What a Connecticut 200A Service Upgrade Costs in 2026

Installed cost in Connecticut including materials, labor, permit, and town inspection. Excludes utility-side work billed separately by Eversource or UI if needed.

The Timeline: Permit to Final Inspection

In Connecticut, a service upgrade requires a town electrical permit and a post-installation inspection by the town electrical inspector. The Eversource or UI service territory also affects coordination. Here is a typical timeline:

1. Day 0: Contract signed, permit application filed. West Electric files the permit application with your town's building department.
2. Days 3-10: Permit issued. Most Connecticut towns issue electrical permits within a few business days for straightforward service upgrades. High-volume towns (Stamford, Bridgeport, Hartford) sometimes take longer.
3. Day 10-14: Installation day. West Electric coordinates a power outage window with the utility (typically 4-6 hours). Work is completed in one day in most cases.
4. Days 15-25: Town inspection scheduled and completed. The town electrical inspector visits to verify the work. Most towns offer inspection slots within a week of request, though this varies by municipality.
5. Days 20-30: Utility reconnect and permission to operate (if paired with solar). If the upgrade is part of a solar project, utility interconnection approval adds time.

Total timeline from signed contract to final inspection is typically 3-5 weeks for a straightforward upgrade.

What to Expect on Installation Day

The power to your home will be off for approximately 4-8 hours. West Electric will coordinate the outage window with Eversource or UI. We typically schedule work to start at 8-9 AM so power is restored by mid-afternoon.

The work itself involves replacing the service entrance conductors (wires from the meter to the panel), installing a new 200A main panel with a full breaker lineup, replacing the meter base if required by the utility or inspector, and completing any required ground rod and bonding work per current NEC.

Your existing circuits are reconnected in the new panel. You do not lose any existing circuits in a straightforward upgrade.

Pairing a Service Upgrade with Other Projects

It almost always makes economic sense to combine a service upgrade with adjacent electrical work, since the panel is already open and a crew is already on site:

• Add a dedicated 60A circuit for an EV charger at the same time
• Run conduit for solar interconnection
• Add a generator interlock for future whole-home backup
• Replace aging outlets and GFCI/AFCI protection where required by current code

Bundling these items into one permit saves you permit fees and inspection visits, and typically reduces total labor cost.

Does a Span Smart Panel Eliminate the Need for a Upgrade?

Sometimes. The Span Smart Panel replaces your existing main panel and uses load management software to prioritize circuits dynamically. In some homes with 100A service, Span can allow EV charging and other new loads to be added without a utility service upgrade by intelligently shedding lower-priority loads during high-draw periods.

This is not a universal solution. It depends on your home's load profile and how you use each circuit. West Electric can evaluate whether Span is a cost-effective alternative to a service upgrade in your specific situation.