Arlington, WI Electrical Panel & Service Upgrades Guide

Estimated Read Time: 13 minutes

If your lights dim when appliances start or you keep tripping breakers, it may be time to upgrade 100 amp to 200 amp service. A 200 amp service gives your home room to grow for EV chargers, hot tubs, and future remodels. In this guide, you will learn what is included, how permits work in Dane County, expected costs, and a step-by-step timeline so you can plan with confidence.

Do You Really Need a 200 Amp Service?

A 200 amp service is about safety, capacity, and future flexibility. Homes that were built decades ago often have fewer circuits and smaller panels. Today’s homes run more high-demand appliances and electronics than ever.

Look for these signs:

1. Frequent breaker trips when multiple appliances run.
2. Lights that flicker or dim, especially when the AC or microwave starts.
3. Warm or buzzing panel, or a panel that smells burnt.
4. You still have a fuse box or a small 100 amp panel with limited spaces.
5. Plans for EV charging, hot tubs, finished basements, or additions.

Many homeowners in Madison, Sun Prairie, and nearby cities find that upgrades pay off with better reliability and fewer nuisances. If you are unsure, a licensed electrician can calculate your load and recommend the right size.

What a 200 Amp Service Upgrade Includes

A true 200 amp service upgrade is more than swapping a box. It brings your service entrance, grounding, and distribution up to modern standards.

Here is what is typically included:

1. Service equipment
   • 200 amp meter socket and service mast or lateral equipment per utility specs.
   • 200 amp main breaker panel with ample spaces for future circuits.
2. Service conductors
   • Properly sized conductors, often 2/0 aluminum or 2 AWG copper for 200 amps, installed to code.
3. Grounding and bonding
   • Grounding electrode system with ground rods and bonding to the water piping if present.
4. Circuit re-termination
   • Clean labeling, proper torque, and separation of neutrals and grounds as required.
5. Safety upgrades
   • Arc-fault and ground-fault protection where required, plus surge protection if requested.

You also gain panel space. Many 100 amp panels offer 20 spaces, while modern 200 amp panels often provide 30 to 42 spaces, letting you add dedicated circuits for EVs, workshops, or finished spaces.

Safety, Code, and Permits in Wisconsin

Electrical work must follow state and local rules. In Wisconsin, SPS 316 adopts the 2020 National Electrical Code. This governs service sizing, grounding, and protection devices. Two helpful facts guide most upgrades:

• Grounding electrode systems: NEC 250 requires proper electrodes. If a single rod does not meet 25 ohms, two ground rods are standard practice.
• AFCI and GFCI protection: NEC 210.12 and 210.8 require arc-fault and ground-fault protection in many living areas and wet locations.

Permits and inspections are required in Madison, Sun Prairie, and surrounding municipalities. Your electrician also coordinates with the utility for power disconnect and reconnect. In our area, that may involve Madison Gas and Electric or Sun Prairie Utilities, depending on your address. A compliant, permitted upgrade protects safety, insurance eligibility, and resale value.

Step-by-Step: How a 200 Amp Upgrade Happens

Here is our proven process for a smooth upgrade in Dane County homes:

1. Load evaluation and proposal
   • We measure your existing loads and discuss future plans like EVs or hot tubs.
   • You receive a clear, itemized proposal with scope, materials, and timeline.
2. Permits and scheduling
   • We submit permit documents and schedule with the city and your utility.
   • You pick a convenient installation date. We advise you on outage windows.
3. Prep work
   • We order the 200 amp panel, meter socket, breakers, and grounding materials.
   • You receive pre-visit reminders and simple homeowner checklists.
4. Installation day
   • Power is safely disconnected. We remove the old equipment and set the new meter socket and panel.
   • Service conductors are upgraded and terminated to manufacturer torque specs.
   • Circuits are neatly re-terminated and labeled. Grounds and neutrals are landed correctly.
5. Inspection and utility reconnect
   • The inspector verifies code compliance. After approval, the utility restores service.
6. Final walkthrough
   • We show you the new labeling, surge device status light if installed, and how to reset AFCI/GFCI breakers.

Most projects are completed in one day with a planned outage window. Complex reroutes or masonry work can add time. You get an as-built panel schedule for easy future reference.

Cost Breakdown and What Drives Price

Every home is different, so budgets vary. In Greater Madison, a straightforward 100 amp to 200 amp service upgrade often ranges from the low $2,000s to the mid $5,000s. Several factors influence price:

• Service type: overhead mast vs underground lateral.
• Meter and panel location: exterior moves or long conductor runs add labor.
• Condition of existing wiring: corroded feeders or unsafe splices must be corrected.
• Code updates: grounding, bonding, and AFCI/GFCI protection.
• Optional adds: whole-home surge protection or subpanels for workshops or additions.

Financing can spread the cost over comfortable payments, and many homeowners pair upgrades with remodels or EV charger installs for efficiency.

Timeline and What to Expect on Install Day

Plan for a single day on most homes, plus permit and utility scheduling time. Here is a typical timeline:

• 1 to 2 weeks: permitting, material procurement, and utility coordination.
• 6 to 8 hours: on-site installation and testing.
• Same day or next business day: inspection and utility reconnect.

How to prepare:

1. Clear a 3 to 4 foot path to the panel and meter.
2. Unplug sensitive electronics or discuss whole-home surge protection.
3. Plan for refrigeration and internet downtime during the outage.

Our crews arrive on time, protect floors with drop cloths, and clean up thoroughly when finished.

Panel Space, Protection Devices, and Surge Strategy

Upgrading service is the perfect time to improve protection across your home.

• AFCI protection reduces the risk of arc-related fires in living spaces.
• GFCI protection guards against shock in wet locations like kitchens, baths, garages, and outdoors.
• Whole-home surge protection helps defend HVAC, electronics, and appliances from utility and lightning surges.

We can also add dedicated circuits for EV chargers, sump pumps, freezers, or workshop tools. Planning now reduces nuisance trips and extension cord clutter later.

Local Considerations in Dane County Homes

Older homes in Madison, Middleton, and Stoughton often have limited panel space and shared neutrals. Remodels and finished attics are common, which can stress a 100 amp service. Cold winters also drive higher electric loads for space heaters and air handlers.

Local utilities and inspectors expect clear labeling, proper bonding, and secure masts. We plan upgrades to match local standards, from mast height to meter placement. Our designers also consider future EV adoption, solar-ready layouts, and generator interlocks when appropriate.

Choosing the Right Electrician for a 200 Amp Upgrade

A service upgrade touches the heart of your electrical system. Select a contractor who:

1. Pulls permits and coordinates inspections.
2. Knows Wisconsin SPS 316 and the 2020 NEC.
3. Installs correctly sized conductors and breakers with manufacturer torque specs.
4. Provides neat labeling and a documented panel schedule.
5. Offers financing and a clear workmanship warranty.

At Cardinal, our licensed and background-checked electricians have upgraded panels across Sun Prairie, Madison, Verona, and Waunakee. We deliver tidy, code-compliant results with upfront pricing and respectful service.

Maintenance After Your 200 Amp Upgrade

Once upgraded, keep your system reliable with simple care:

• Annual visual checks for rust, moisture, or scorching.
• Test GFCI and AFCI breakers as recommended by the manufacturer.
• Consider periodic torque checks on terminations during whole-home checkups.
• Keep the area around the panel clear for ventilation and access.

We also offer maintenance plans that include electrical safety checks. Regular attention helps your new system last for decades.

Common Questions About Upgrading 100 Amp to 200 Amp Service

Here are fast answers to questions we hear most often:

1. Is 200 amps the new standard? Many modern homes use 200 amps to support larger HVAC, EV charging, and future loads. Your exact need depends on a load calculation.
2. Will I need new branch circuits? Not always. We reuse safe, code-compliant wiring and add circuits where needed for capacity or protection.
3. How long will my power be off? Typically 4 to 8 hours during installation and inspection. Complex projects can take longer.
4. Can I add an EV charger later? Yes. A 200 amp service and spare panel spaces make EV charging much simpler.
5. Do I need surge protection? We recommend it to protect HVAC, appliances, and electronics from damaging surges.

What Homeowners Are Saying

"It was a very positive experience to have had Ben and Dominic place a new and safer electric panel upgrade to my home. They were exceptionally hard working, courteous and pleasant to have around! Definitely 5 stars plus plus!!! I would definitely recommend Cardinal to anyone!!!!"
–Dorothy H., Sun Prairie

Frequently Asked Questions

How do I know if I should upgrade from 100 amp to 200 amp?

If you have frequent breaker trips, dimming lights, a warm panel, or plans for EVs or hot tubs, a 200 amp service can help.

Do I need a permit for a 200 amp service upgrade in Dane County?

Yes. Local permits and inspections are required in Madison, Sun Prairie, and nearby cities. Your electrician handles them.

How much does a 200 amp service upgrade cost near Madison?

Many projects fall between the low $2,000s and mid $5,000s, depending on scope, location, and code updates.

Will my existing wiring work with a 200 amp panel?

Often yes. Safe, code-compliant branch circuits can remain. We add or rework circuits when capacity or protection is needed.

How long does a 200 amp upgrade take?

Most installations take one day, plus permit and utility scheduling. Expect a planned outage of 4 to 8 hours.

Conclusion

Upgrading from 100 amp to 200 amp service increases safety, reliability, and room for growth. In Greater Madison and Sun Prairie, permits, inspections, and code compliance matter. A properly designed upgrade delivers cleaner power today and fewer headaches tomorrow.

Ready to plan your 200 amp service upgrade in Dane County? We are here to help.

Schedule Your 200 Amp Service Upgrade

Talk to a licensed, background-checked electrician today.

• Call: (608) 291-6473
• Web: https://www.cardinalhvac.com/
• Service area: Madison, Sun Prairie, Fitchburg, Middleton, Deforest, Waunakee, Verona, McFarland, Stoughton, Oregon

Get a clear proposal, permit handling, and a tidy, code-compliant installation backed by local experts.

About Cardinal Heating & Air Conditioning

Serving Sun Prairie and Greater Madison since 1984, Cardinal is your one-stop shop for electrical, HVAC, and plumbing. Our licensed, background-checked technicians deliver clean, code-compliant work with upfront pricing. We are multi-year winners of Best of Sun Prairie and Best of Madison. Expect shoe covers, tidy work areas, and clear communication. We offer 24-hour emergency service and financing options for qualified projects. Choose Cardinal for long-lasting, cost-effective solutions backed by local expertise.