Whole House Surge Protector

Most people think about surge protection after something expensive stops working. In the south Denver metro that is usually after a storm, and the damage is rarely dramatic. It is a control board in a furnace, a garage door opener, a range with a dead panel. This page covers what protection costs, what it actually does, and what it does not.

Quick Answer: What Does Whole-Home Surge Protection Cost in Littleton?

Whole-home surge protection with MZ Electric typically runs $260–$510, based on our own job history across Littleton, Highlands Ranch, Centennial, Parker and the south Denver metro.

That covers a surge protective device installed at your service equipment. It is one of the least expensive things on our price list and it protects the most.

Whole-Home Surge Protection Cost — MZ Electric

Service MZ Electric range What it covers
Whole-home surge protection (replace / install) $260–$510 Surge protective device installed at the service equipment, with a dedicated breaker and terminations

 

What Determines Where You Land in That Range

  • The device rating you choose. Surge protective devices differ in their let-through voltage, their surge current rating, and their diagnostics. A better device costs more and does more.
  • Where and how it mounts. Some panels take an integrated device in a breaker space. Others need the device mounted adjacent and connected with short leads, which matters because lead length affects performance.
  • Panel space and condition. A full panel with no available double space has to be solved before a device can be added.
  • Whether you also want point-of-use protection. A service-level device handles what comes in on the service conductors. Sensitive electronics still benefit from a good point-of-use protector, which is inexpensive and something you can buy yourself.

A Note for South Denver Metro Homeowners

  • We live in one of the most active hail and thunderstorm corridors in the country. NOAA’s National Severe Storms Laboratory identifies the area where Colorado, Nebraska and Wyoming meet as “hail alley,” averaging seven to nine hail days per year, and the National Weather Service records Colorado averaging on the order of 5,350 lightning flashes statewide on a typical July day. Surge events are not an abstract risk on the Front Range. They are a season.
  • Code now requires this on a replaced service, not just new construction. The 2020 National Electrical Code added Section 230.67, which requires a Type 1 or Type 2 surge protective device on services supplying dwelling units, and it applies when an existing service is replaced. If you are having a panel or service upgrade done, this is part of the work rather than an optional extra.
  • The damage you should actually be worried about is boring. Homeowners picture a lightning bolt. What we see is cumulative: the electronic control board in a furnace or a modern range, an HVAC control, a garage door opener, an LED driver. Those parts have gotten more expensive and more common in the last fifteen years, which is exactly why a device that costs a few hundred dollars now pencils out when it did not in 1995.
  • Permits and inspection standards apply. Colorado’s State Electrical Board requires electrical work to be performed by a licensed electrician in compliance with the National Electrical Code, with permits and inspections through the state board or the local authority.

Power Surges Took Out the Fridge: An 8 a.m. Call, an 8:30 Fix, and a New Panel With Surge Protection the Same Day

A string of power surges hit a homeowner’s neighborhood, and with no surge protection on their old panel, several outlets went dead, including the one feeding a freshly restocked fridge. They called us at 8 a.m., and we had a technician at the house by 8:30 to get the power restored. Because the old panel had other problems too, they asked for a quote on a full upgrade with surge protection, and we finished all of that work the same day. Before leaving, our technician checked every outlet in the home, went up into the attic, and explained what he found in as much detail as the homeowner wanted.

What Surge Protection Does Not Do

We would rather set this expectation now than after a storm.

A service-level surge protective device clamps transient overvoltage coming in on your service conductors and diverts it. That covers the large majority of surge events, most of which originate from utility switching and nearby strikes rather than from a direct hit.

It is not a guarantee against a direct lightning strike to the structure, it does not protect against extended overvoltage conditions, and it does not replace homeowners insurance. Surge protective devices also wear. They absorb energy over their life and eventually stop protecting, which is why most have a status indicator worth checking, and why a device that has taken a serious hit should be evaluated rather than assumed to be fine.

Signs You Should Call a Pro

  • You are already having a panel or service upgrade done
  • Your surge device’s status indicator is off or showing a fault
  • You have lost electronics or an appliance control board after a storm
  • Your home has significant electronics, a home office, or an EV charger
  • You have never had a service-level device installed and do not know what protection you have

Get an Upfront Surge Protection 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

Whole-home surge protection with MZ Electric typically runs $260–$510, covering a surge protective device installed at your service equipment.

For dwelling unit services, yes in the 2020 National Electrical Code. Section 230.67 requires a Type 1 or Type 2 surge protective device on services supplying dwelling units, and it applies when an existing service is replaced, not only to new construction.

No. A service-level device handles transient overvoltage on your service conductors, which covers most real surge events, including utility switching and nearby strikes. It is not a defense against a direct strike to the structure and it does not replace insurance.

A good point-of-use protector is still worth having for sensitive electronics. Service-level and point-of-use protection are layers, not alternatives.

Yes. They absorb energy over their service life and eventually stop protecting. Most have a status indicator. If yours is dark or showing a fault, or if you have had a significant surge event, it should be evaluated.

Sources

  • Pricing: MZ Electric Price Benchmarks, contractor-entered ranges, pulled 08-31-2026
  • National Fire Protection Association, NFPA 70 National Electrical Code (2020), Section 230.67 — Type 1 or Type 2 surge protective device required for dwelling unit services, including replaced services; UL 1449 Standard for Surge Protective Devices referenced for device types
  • NOAA National Severe Storms Laboratory — hail climatology; the Colorado, Nebraska and Wyoming intersection (“hail alley”) averages seven to nine hail days per year: nssl.noaa.gov
  • National Weather Service, Colorado lightning climatology — statewide flash counts by month: weather.gov
  • 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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