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Electrical Panel Replacement: Timeline, Cost, and What to Expect

Chapter 01 · Panels & Service Entrance

Electrical Panel Replacement: Timeline, Cost, and What to Expect

Licensed CO electrician (ME.0600978), 1-year labor warranty, and 468 five-star reviews behind every job.

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How Long a Panel Replacement Actually Takes

Most electrical panel replacements take between four and eight hours from the time we shut off the main breaker to the moment we restore power. A straightforward 200-amp swap in a home with accessible wiring lands closer to four. Older homes, tight panel locations, or outdated wiring that needs correction before the new panel can be energized push that toward a full day. Either way, one licensed visit from All Electric handles it start to finish, permit included. If you've been putting this off because you weren't sure what you were getting into, call (720) 951-4619 and we'll give you a straight answer before you book anything.

What drives cost up or down on a panel job is almost never the panel itself. It's the condition of the wiring feeding it, whether your meter loop needs updating, how many circuit breakers require individual attention, and whether a permit inspection is required before the utility will reconnect service. A basic 100-amp to 200-amp upgrade on a clean, accessible panel looks very different from a Zinsco or Federal Pacific replacement in a home where the original wiring hasn't been touched in forty years. Those older panels are genuinely dangerous and the delay in addressing them is the real cost. We carry a 1-year warranty on all labor, and financing is available for larger jobs. Every job is different, contact All Electric for an accurate estimate.

Our Process

What the Replacement Timeline Looks Like

  1. Step 1: Evaluation and Permit Pull

    Before any work starts, we assess the existing panel, meter loop, and grounding system. If the job requires a permit, we pull it. Some homeowners skip this step with other contractors. We don't. A permitted panel replacement is the only kind your insurance company recognizes.

  2. Step 2: Disconnect, Install, Transfer

    We shut off the main breaker, remove the old panel, and mount the new one. Every circuit gets transferred, labeled, and tested individually. Clean installs take four to six hours. Homes with Zinsco, Federal Pacific, or Federal Pacific Stab-Lok panels sometimes need additional time to address wiring issues we find inside.

  3. Step 3: Inspection and Power Restoration

    After installation, we schedule the utility inspection. Once the inspector signs off, power comes back on. We walk you through the new panel before we leave so you know exactly what every breaker controls. The whole process, including inspection, typically completes within one to two business days.

Know the Risks

Panels That Can't Wait: Zinsco and Federal Pacific

panel size work, professional service in Denver, CO

These two panel brands are the ones we see most often in homes where the risk has been sitting quietly for years.

Zinsco panels were installed widely through the 1970s. The problem is that their breakers fail to trip when they're overloaded, which means the circuit keeps drawing current through a fault instead of shutting off. Federal Pacific panels have a similar issue with their Stab-Lok breakers, and they're in an enormous number of Front Range homes built between the 1950s and 1980s. Neither of these is a 'monitor and see' situation. Honestly, if your home still has one of these panels and your insurance company hasn't flagged it yet, count yourself lucky for now. The electrical code violations associated with these panels are real, and a replacement is the only fix. We handle Zinsco and Federal Pacific replacements regularly across the metro. Call (720) 951-4619 to schedule a panel evaluation if you're not sure what you have.

Cost Factors

What Actually Drives Your Panel Replacement Cost

  1. Panel Size

    A 100-amp panel upgrade to 200 amps is the most common residential job. Some older homes are still on 60-amp service, which requires a full meter loop replacement in addition to the panel. Larger homes may need 400-amp service or a sub-panel.

  2. Panel Brand and Condition

    A clean, modern panel in good condition swaps quickly. A Zinsco or Federal Pacific replacement takes longer because we correct wiring issues during the install. Every additional problem we find inside the wall adds time, not just material cost.

  3. Meter Loop

    If your meter loop, the weatherhead and service entrance cable coming into your home, is undersized or damaged, the utility company won't reconnect to a new 200-amp panel without an upgrade. We inspect this before every job so there are no surprises on inspection day.

  4. Permit Requirements

    A permitted panel replacement costs more upfront than one without a permit. It's also the only one that protects you when you sell the home, file an insurance claim, or need to pass a home inspection. We pull permits. No exceptions.

  5. Access and Location

    A panel mounted in a finished basement behind drywall takes longer to access and inspect than one in an unfinished utility room. Same work, more time. We assess access during the evaluation so our estimate reflects the actual job, not a best-case scenario.

  6. Number of Circuits

    A 20-circuit panel and a 40-circuit panel are different jobs. More circuits mean more individual breaker transfers, more testing, and more time. Homes with dedicated circuits for HVAC, appliances, or EV chargers often have more to move than a standard load count.

Signs Your Panel Needs Replacement Now

  • Breakers that trip frequently or won't reset

    A breaker that trips and won't hold is either failing or protecting you from an overloaded circuit. Either way, it's telling you something.

  • Visible burn marks, melted plastic, or unusual smells

    Scorch marks inside a panel are a sign that overheating has already occurred. This is not a cosmetic issue.

  • Lights that flicker or dim when appliances run

    Dimming lights under load often mean your panel is undersized for your home's actual demand. It's a sign you've outgrown your current service.

  • A panel that was flagged during a home inspection

    If a home inspector flagged your panel, your insurance company may already know. We see a lot of these jobs come in from homeowners who just received a letter. An electrical inspection confirms the scope before any work begins.

Why homeowners trust us

What You Get With All Electric

Nine years in. 468 Google reviews. We don't cut corners on panel work because the consequences aren't abstract.

  • CO License #ME.0600978

    Verifiable with the state. We're not a handyman with a multimeter.

    Verify with the state

  • Fully insured

    Every job, every visit, no exceptions.

  • 1-year labor warranty

    If something we touched fails within a year, we fix it.

  • Permits pulled and inspections handled

    We manage the utility coordination so you don't have to.

Daniel VargasOwner · Family-owned · Denver Local 4.9 · 468 Google reviews

Panel Replacement Questions We Hear Every Week

Not answered here? Call (720) 951-4619 and ask the electrician.

How long does it actually take to replace a breaker box?
For a standard 200-amp residential panel replacement with accessible wiring, plan on four to eight hours of on-site work. Older panels with corroded lugs, undersized branch wiring, or knob-and-tube feeding into the box add time. We tell you upfront what we're estimating and why, not after the fact.
Will I be without power all day during the replacement?
Power is off from the moment we disconnect the main breaker until we restore it after the new panel is wired and tested. On a typical job, that's four to six hours. We schedule work so the outage window lands mid-day when possible. Post-install, power is back on the same day in most cases. The utility inspection can sometimes be scheduled same-day or next-day depending on the jurisdiction.
Do I need a permit to replace an electrical panel in Colorado?
Yes. A panel replacement is a permitted electrical job in Colorado. The permit triggers an inspection by the local authority or utility, which verifies the work meets current code. A panel replaced without a permit creates real problems when you sell the home or file an insurance claim. We pull the permit as part of every job. If another contractor told you permits aren't necessary on this type of work, ask them to explain that in writing.
What's the difference between a panel replacement and a panel upgrade?
A replacement swaps the existing panel for a new one of the same amperage, usually because the old panel is unsafe, failed, or recalled. An upgrade increases your service capacity, most commonly from 100 amps to 200 amps. Many jobs involve both simultaneously. If you have a Zinsco or Federal Pacific Stab-Lok panel, that's a replacement job regardless of the amperage. See our overview of electrical panels and breaker boxes for a deeper look at the differences.
Can a panel replacement fix flickering lights or tripping breakers?
Sometimes, and sometimes those symptoms point somewhere else entirely. Frequent tripping can mean an overloaded circuit, a failing breaker, or a wiring fault that exists outside the panel. Flickering lights can be a loose neutral connection that has nothing to do with the panel itself. We run diagnostics before recommending a replacement. If circuit breaker repair is the right fix, that's what we'll tell you. We won't sell you a full panel replacement when a targeted repair solves the problem.
Is financing available for panel replacement?
Yes. Panel replacement is one of the higher-ticket electrical jobs, and financing is available through All Electric for qualifying jobs. Call (720) 951-4619 or use the online booking form to discuss options before scheduling. We'd rather work out a payment plan with you than watch a safety issue get delayed because of cost.
What is the difference between a Zinsco panel replacement and a standard panel swap?
Zinsco panels have breakers that fail to trip under overload, meaning the circuit keeps energizing through a fault. That makes them a genuine fire risk. Replacing one isn't just a panel swap: we inspect every branch circuit terminating in that panel, correct any issues we find, and document the work for the permit inspection. It typically takes longer than a standard replacement and should not be delayed.
What is the cost to replace a Federal Pacific electrical panel?
Federal Pacific Stab-Lok panels are among the most common recalled panels we replace in older Front Range homes. Cost depends on your current service amperage, whether the meter loop needs updating, access conditions, and what we find inside the existing enclosure. We don't publish ranges because the spread is wide enough to be misleading. Every job is different, contact All Electric for an accurate estimate.

Straight from Google

What Our Customers Say

4.9468 verified Google reviews
Got the job done well, pleasant to work with.
Brian NicholsBrian NicholsSep 2026 · Google
All Electric is the best! Knowledgeable in fair and troubleshoot till they get the job done, if needed. Highly recommend 🙌🏽
gina dgina dSep 2026 · Google
Fantastic service. They showed up, assisted in the repairs, found the underlying issues and fixed them and then explained what those issues were in a manner that I could understand. Top service, as always.
Sean FrohlingSean FrohlingAug 2026 · Google
Same day service! Was here in 3 hours. Very honest and charge was kept at the minimum. Polite service as well.
Fred LudlowFred LudlowAug 2026 · Google
Very responsive. Easy to work with. Would definitely recommend to friends and family.
BritneyBritneyAug 2026 · Google
Electrician came out the next day after calling to install two light fixtures. Minimal issues and got them both installed successfully even though we have an old home. Pricing was reasonable to me. I will definitely be using them again for any similar needs!
Jillian L. CallaghanJillian L. CallaghanAug 2026 · Google
Awesome service. Quick prompt and very professional and knows the business. Daniel Vargas was the Master Tech. Accessed the problem and was quick to diagnose! Two faulty breakers. Highly recommend.
Michelle BakerMichelle BakerAug 2026 · Google
Daniel was great - solution-oriented, super-responsive, knowledgeable and really nice to work with - I will look to Daniel aand All Electric for future needs - thanks!
Travis BoganTravis BoganAug 2026 · Google
Read all 468 reviews

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