Electrical Panels
closeup electrical panel

Most panel upgrades in the south Denver metro do not start with a failed panel. They start with a homeowner adding something — an EV charger, a hot tub, a finished basement, a heat pump — and finding out the existing service does not have the capacity or the breaker spaces to take it. This page covers what that work costs with us, what moves the number, and one code requirement that surprises nearly everyone.

Quick Answer: What Does an Electrical Panel Upgrade Cost in Littleton?

A panel or service upgrade with MZ Electric typically runs $2,000–$6,700, based on our own job history across Littleton, Highlands Ranch, Centennial, Parker and the south Denver metro.

That is a wide range because “panel upgrade” covers everything from swapping a panel on an existing 200-amp service to pulling a new service entrance, coordinating a meter release with the utility, and passing inspection. Repairs to an existing panel are separate and less.

Electrical Panel Cost — MZ Electric

Service MZ Electric range What it covers
Panel and service upgrade (replace / install) $2,000–$6,700 New panel, breakers, grounding and

bonding, permit and inspection

coordination
Panel repair $700–$900 Work on an existing panel that stays in place
Free estimate on upgrades Yes Free estimate on upgrades

Common add-ons, when the job needs them:

Add-on MZ Electric range
400A service for large homes $2,500–$4,000
AFCI/GFCI breaker upgrades $3,000–$3,300

 

What Determines Where You Land in That Range

  • Whether the service itself changes. Replacing a panel on an existing 200-amp service is a different job than raising the service from 100 to 200 amps, which involves the meter, the service entrance conductors, and the utility.
  • Where the panel lives and what is around it. A panel in an unfinished basement with open joists is straightforward. One in a finished laundry room, behind cabinetry, or on an exterior wall with siding to reopen is not.
  • The condition of what we find. Aluminum branch conductors, a shared neutral on a multiwire circuit, an undersized or missing ground electrode system — none of these are optional to correct once the panel is opened.
  • Breaker type and count. Modern code requires arc-fault and ground-fault protection on far more circuits than the panel you are replacing likely had, and those breakers cost several times what a standard breaker costs.

A Note for South Denver Metro Homeowners

  • A replaced service now requires whole-home surge protection. This is the one that catches people. The 2020 National Electrical Code added Section 230.67, which requires a Type 1 or Type 2 surge protective device on the service supplying a dwelling unit — and it applies when an existing service is replaced, not only to new construction. If you are upgrading your service, plan on the SPD being part of the job rather than an upsell.
  • The utility is on the critical path, not just the electrician. Raising a service means coordinating a meter release and reconnect with Xcel Energy. That scheduling, not the labor, is often what sets the calendar on these jobs.
  • Permits and inspections are required, and they are worth wanting. Colorado’s State Electrical Board requires this work to be performed by a licensed electrician in compliance with the National Electrical Code, with inspection by the state board or the local authority. An uninspected panel is a problem at resale and can be a problem with your insurer.
  • 100-amp services are still common in our older stock. Plenty of homes across Littleton and Centennial from the 1960s and 1970s are still on the original service. That was adequate for the loads of the era. It is not adequate for an EV charger, a heat pump, and a finished basement on top of the existing house.

The Flicker Other Electricians Couldn’t Find: A Burnt Junction Box Hidden in a Basement Ceiling

A homeowner called us about basement lights that flickered at random, a problem other companies had either missed or didn’t want to chase. Over two days on site, our technician replaced the old electrical panel and traced the flicker to a junction box hidden in the ceiling, where loose connections had been heating up until the box burned. He walked the family through what he found, answered every question they had, and ran a dedicated circuit for the basement fridge so it’s safe and reliable.

Repair or Replace?

Panel repair at $700–$900 is the right call when the panel itself is sound and modern and the issue is a specific component — a failed breaker, a loose lug, a damaged bus connection that can be properly corrected.

Replacement is the right call when the panel is obsolete, when the bus is damaged or corroded, when there is no capacity or physical space left for the circuits you need, or when the panel is a make that is no longer considered serviceable. If your panel falls into that last category, we will tell you plainly. Putting $800 into a panel that needs to come out is not a repair, it is a delay.

Signs You Should Call a Pro

  • Breakers that trip repeatedly, or that feel warm to the touch
  • Scorching, rust, or a burning smell at or inside the panel
  • Lights that dim when a large appliance starts
  • A full panel with no open spaces, or tandem breakers filling slots
  • You are planning an EV charger, hot tub, heat pump, ADU, or basement finish ● The panel has never been inspected, or you have no permit history for it

Get an Upfront Panel Upgrade Quote in Littleton

MZ Electric is family owned and operated, with over 15 years serving Littleton, Highlands Ranch, Centennial, Parker and the Denver metro, available 24/7. Our team members are background-checked, we stand behind our work with a satisfaction guarantee, and we hold Colorado electrical license #EC7816. Financing and a maintenance plan are available. *Integrity, creativity, experience.*

Call (303) 933-9220 or schedule at mzelectric.com.

Frequently Asked Questions

A panel or service upgrade with MZ Electric typically runs $2,000–$6,700. Where you land depends mainly on whether the service amperage changes, where the panel is located, and what condition the existing wiring is in.

Panel repair with MZ Electric runs $700–$900. That is the right choice when the panel is modern and sound and a specific component has failed, not when the panel itself is obsolete.

Yes. Colorado’s State Electrical Board requires electrical work to be performed by a licensed electrician in compliance with the National Electrical Code, with a permit and an inspection. We handle the permit and coordinate the inspection.

In most cases, yes. The 2020 National Electrical Code, Section 230.67, requires a Type 1 or Type 2 surge protective device on a dwelling unit service, including when an existing service is replaced. We price it as part of the upgrade rather than as a surprise.

The electrical work is typically a day. The schedule is usually set by the utility meter release rather than by us, so we confirm that timeline with you before we book the work.

Sources

  • Pricing: MZ Electric Price Benchmarks, contractor-entered ranges and price factors, pulled 2026-08-31
  • National Fire Protection Association, NFPA 70 National Electrical Code (2020), Section 230.67 — surge protection required for dwelling unit services, including replaced services
  • Colorado Department of Regulatory Agencies, Division of Professions and Occupations, State Electrical Board — licensing, permit and inspection requirements: dpo.colorado.gov/Electrical
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