When a Panel Upgrade Makes Sense
Most Denver-area homes built before the 1990s were wired for a fraction of what a modern household draws. A 100-amp service was generous when the big loads were a furnace, a water heater, and a range.
Add an EV charger, a heat pump, a hot tub, a finished basement, or a shop circuit in the garage, and that service is suddenly the bottleneck.
The clearest signals are practical rather than technical. You want to add something and an electrician tells you there is no capacity. Your panel is full and someone has already installed tandem breakers to make room.
You have fuses rather than breakers. Or the panel carries a manufacturer with a documented failure history, in which case replacement is worth doing on its own merits regardless of capacity.
What a Service Upgrade Actually Involves
A service upgrade is more than swapping a box. It typically means a new meter socket, new service entrance conductors, a new panel and breakers, updated grounding and bonding to current code, and coordination with the utility to disconnect and reconnect power.
It requires a permit and an inspection, and the work is scheduled around the utility’s availability.
We walk the house first, count the existing circuits, ask what you plan to add over the next few years, and size the new service to that. Upgrading from 100 to 200 amps is the common move. Going further only makes sense for larger homes or unusual loads, and we will tell you when it does not.
Panel Replacement Without a Service Upgrade
Sometimes the service size is fine and the panel itself is the problem: a failing bus, corroded connections, a discontinued breaker line you can no longer buy, or a brand you simply do not want in the house. A like-for-like panel replacement is faster, cheaper, and usually does not require utility coordination.
Sub-Panels
If the main service has capacity but the panel is out of physical space, a sub-panel is often the cheaper answer. Sub-panels also make sense for detached garages, workshops, and finished basements where you want local disconnects and room to grow.
What You Get Afterward
Labeled circuits, current grounding and bonding, AFCI and GFCI protection where code requires it, room to add, and a passed inspection on record. That last one matters more than people expect: unpermitted electrical work turns up during a sale and can hold up a closing.
Serving the Denver Metro
We handle panel work in Denver, Westminster, Arvada, Broomfield, Thornton, Golden, Evergreen, and the surrounding Front Range communities, from both our Westminster and Evergreen locations. Financing is available on larger jobs.
If your panel is full, obsolete, or standing between you and something you want to add, call Warm Welcome or schedule online. We will run the load calculation, tell you honestly whether an upgrade is needed, and give you a firm number before any work starts.
Frequently Asked Questions
How do I know if my electrical panel needs upgrading?
A 100-amp service is the most common trigger, along with a panel that is physically full, tandem breakers already installed to create space, fuses rather than breakers, or a panel brand with a documented failure history. Wanting to add an EV charger or a heat pump is the other common reason.
How long does a panel upgrade take?
Most residential upgrades are completed in a single day, though the power is off for a significant portion of it. Scheduling depends on the permit and on the utility, since the meter must be pulled and reset. We handle both and give you a firm window before we start.
Do I need a permit for an electrical panel upgrade?
Yes. A service upgrade requires a permit and an inspection in essentially every Denver-area jurisdiction. We pull the permit, schedule the inspection, and make sure the work is on record. Unpermitted panel work is a common finding during a home sale and is expensive to resolve after the fact.
Do I need a panel upgrade to install an EV charger?
Not always. If your existing service has spare capacity, a charger can often be added on a dedicated circuit without touching the panel. The only way to know is a load calculation, which we run before quoting so you find out up front rather than mid-job.
Which electrical panel brands are considered a safety concern?
Federal Pacific Stab-Lok and Zinsco panels are the two most commonly flagged, and some insurers ask about them directly. If you have either, replacement is worth doing regardless of whether you need more capacity. We can identify what you have during a visit.
