200 Amp Service Upgrade

A 200 amp service upgrade replaces the entire electrical service on your house, from the point where the utility conductors land all the way to the new main breaker panel, so the home can safely carry loads a 100 amp service was never sized for. Most of the calls we get for this work come from South Florida homeowners who just bought an EV, are replacing an air conditioning system, are adding a pool heater, or were told during a home inspection that the existing service is at its limit.

This is a permitted job that involves the power company, the building department, and a planned outage at your house. It is not a same-afternoon repair, and any contractor who tells you otherwise is skipping steps. Below is what the work involves, what drives the scope, and what we need to know before we can put a real number in front of you.

Signs a 100 amp service has run out of room

A 100 amp service was generous in 1968. It fed a range, a dryer, a small central air unit, a water heater, and lighting, and it had spare capacity. The house that service was built for does not exist anymore.

Here is what has changed in a typical Broward or north Miami-Dade home:

• Air conditioning runs eight or nine months a year. A larger, higher tonnage system with electric strip heat in the air handler can pull a serious share of a 100 amp service by itself. When homeowners go from a three ton to a four or five ton system, or add a second system for an addition or a converted garage, the service is often the real bottleneck.
• EV charging is a continuous load. A Level 2 charger at 40 amps has to be calculated at 50 amps because it runs for hours without a break. On a 100 amp service that single addition can consume half the available capacity.
• Pool equipment adds up. A variable speed pump, a salt chlorine generator, a booster pump for a cleaner, and especially an electric pool heat pump are all significant loads, and the heater is the one that surprises people.
• Electric tankless water heaters are enormous. A whole-house electric tankless unit sized for a family often needs three or four dedicated double pole circuits and can demand more amperage than the entire existing service. These are the single most common reason a 100 amp panel simply cannot be worked around.
• Kitchens got hungry. Induction ranges, double wall ovens, built-in coffee systems, wine refrigerators, and a second dishwasher all land on the same panel.

You may also see the softer symptoms: no open breaker spaces, tandem breakers stuffed into every slot, a panel with two circuits landed on one breaker, lights dimming when the compressor starts, or a main breaker that trips on the hottest afternoon of the year. Those are capacity signals, not nuisance faults.

The load calculation comes first

Before we quote, before we order equipment, and before the building department will approve anything, the house gets a load calculation. This is a written document, and it is the difference between an engineered upgrade and a guess.

A dwelling load calculation looks at:

• General lighting and receptacle load based on the conditioned square footage of the house, at a set volt-amp value per square foot.
• Two small appliance branch circuits for the kitchen and a laundry circuit, each carried at a fixed value.
• Fixed appliances such as the dishwasher, disposal, water heater, dryer, range, and any built-in equipment, taken at nameplate rating.
• Heating and cooling, where only the larger of the two is counted since they do not run at the same time, with the compressor and the air handler blower and strip heat all accounted for correctly.
• Motor loads such as pool pumps and well pumps, with the largest motor getting an additional percentage added.
• Continuous loads such as EV charging equipment, calculated at 125 percent of the rated current.
• Demand factors, which is where the calculation stops being arithmetic. The standard method applies demand percentages to different categories. The optional method for dwellings takes the first block of connected load at full value and the remainder at a reduced percentage, then adds the air conditioning load. On the same house the two methods can produce meaningfully different results, and part of our job is running it the way that reflects how the home is actually used while still satisfying the inspector.

Two useful outcomes come from this. First, we find out whether 200 amps is genuinely enough, or whether the house is heading toward a larger service. Second, we occasionally find that the customer does not need a service upgrade at all, and that load management on the EV charger or a correctly sized subpanel solves the problem for far less disruption. We would rather tell you that on day one.

What a 200 amp service upgrade actually replaces

People picture a new panel on the wall. The panel is one piece of it. On an overhead service, a complete upgrade typically includes:

• The weatherhead and service mast or riser. The mast has to be rigid enough to take the pull of the utility drop without bending, properly braced or guyed if it extends above the roof, and tall enough to keep the drop at legal clearance over the yard, the driveway, and any roof it crosses.
• The service entrance conductors. A 200 amp residential service is commonly run with 4/0 aluminum service entrance cable or the copper equivalent, sized under the rules that apply specifically to dwelling services. The old 100 amp conductors are not reusable.
• The meter can. The socket has to be rated for the new service, approved by the utility, and mounted at the height they require. Old cans with rusted-out bottoms, burned lugs, or no bypass are replaced as a matter of course near the coast.
• The main breaker panel. New enclosure, new 200 amp main, new bus, new breakers, and enough spaces to leave the house room to grow. If the old panel was indoors in a hallway closet and the new one goes outside, that is a different scope than a straight swap in place.
• The grounding electrode system. New ground rods driven to depth and spaced correctly, a properly sized grounding electrode conductor, a bond to the metallic water piping where it exists, and connection to any concrete encased electrode that is accessible.
• Bonding. Metallic gas piping tied into the bonding system, an intersystem bonding termination provided so cable, satellite, and phone can land their grounds properly, the main bonding jumper installed in the service equipment, and neutrals and grounds separated in every downstream subpanel.
• Surge protection at the service. Current code requires a surge protective device when service equipment on a dwelling is replaced. In a lightning capital like South Florida this is one of the genuinely useful requirements on the books.

On an underground service the mast and weatherhead come out of the picture and are replaced by conduit, a service lateral, and coordination on who supplies and pulls the underground conductors, which varies by how the neighborhood was originally built.

Working with the power company on the meter and the cutover

You cannot legally or safely cut the seal on your meter, and the meter cannot be pulled by the homeowner. The utility owns the meter and everything on their side of it. We handle the service change request, provide the details they need on the new equipment, and schedule the disconnect.

The typical sequence on a single family home looks like this. We pull the permit. On the work day, the utility de-energizes the service, or we work under an approved arrangement for the meter to be pulled. The old meter can, conductors, mast, and panel come off. New equipment goes up, conductors are pulled and terminated, grounding and bonding are installed, and every branch circuit is landed, identified, and labeled.

Then the inspection happens. The building department has to release the job before the utility will reconnect and set the meter. That release, not our opinion, is what restores power. This is why we do not make promises about the exact hour your lights come back on: the inspector and the utility control that part of the calendar, and we schedule the work to give both of them the best chance of landing on the same day.

Plan for the house to be without power for the working day. If someone in the home depends on medical equipment, or you have a large amount of frozen inventory, tell us up front and we will plan around it. Call us at (954) 602-0050 and we will walk through the outage window before you commit to a date.

Permits and inspection

A service upgrade is always permitted work. There is no version of this job that is legitimately done without a permit, and the utility will not reconnect an unpermitted service change. We pull the permit as the contractor of record, which means the responsibility for the work meeting code sits with us, not with you.

Depending on the municipality, you may see an inspection of the grounding electrodes before they are concealed, and always a final electrical inspection of the completed service. Cities inside Broward County each run their own building departments with their own scheduling, and the coastal cities we cover in Miami-Dade and Palm Beach County have their own rhythms. We do this often enough in each of them to know what a given inspector wants to see, which is a real part of the value. Our service area page lists the cities we work in regularly.

One more permitting note that matters at resale: an upgraded service with a closed permit is a documented improvement. An upgraded service with an open or nonexistent permit becomes a problem at closing, and it usually becomes the seller's problem at the worst possible moment.

What happens to your existing circuits

Every branch circuit in the old panel has to be re-landed in the new one. That sounds simple and often is not, for a few reasons.

Old panels were frequently installed with short conductor tails. If the new panel is larger or sits in a slightly different position, circuits may need to be extended with proper splices in an accessible junction box, or the wiring may need to be brought into a gutter above the panel. We do not stretch conductors or make hidden splices in a wall.

Breakers do not transfer between brands, and older breakers are not reusable in a new panel even when they physically fit. Everything gets new overcurrent protection matched to the panel it is installed in.

Arc fault and ground fault protection is the part homeowners are least prepared for. Modern requirements call for arc fault protection on most living-area circuits and ground fault protection in kitchens, bathrooms, laundry areas, garages, outdoors, and near pools. When we bring the branch circuits into new service equipment, these devices go in. On older wiring, an AFCI breaker will occasionally reveal a genuine defect in the existing wiring that was there all along, such as a shared neutral or a damaged conductor. That is the breaker doing its job, and we will show you exactly what it found before recommending any repair. If your house has cloth-insulated or aluminum branch wiring, read our notes on aluminum branch wiring risks and fixes before you plan the budget, because the panel is not always where the story ends.

Why a panel swap alone is not a service upgrade

This is the single most common misunderstanding, and sometimes it is sold that way on purpose.

Replacing an old load center with a new 200 amp rated panel while leaving the original 100 amp meter can, the original service entrance conductors, and a 100 amp main in place does not give you a 200 amp service. The service is still limited by the smallest link in the chain. You have a modern panel with modern breakers, which is a real safety improvement if you are coming out of a Federal Pacific or Zinsco panel, but you have not gained one amp of capacity.

There is a legitimate version of the smaller job. A panel replacement is exactly the right call when the load calculation shows the existing service is adequate and the problem is the panel itself: obsolete breakers, a corroded bus, a burned lug, or no available spaces. What is not legitimate is charging for an upgrade and delivering a swap. If a quote you are comparing does not list the meter can, the service conductors, and the grounding electrode system as line items, ask what is being replaced.

Grounding and bonding gets rebuilt, not reused

The grounding electrode system on a 1970s house is often a single rod driven next to the meter, a clamp that has gone green, and a bare conductor that has corroded through where it enters the soil. Salt air and irrigation water eat this hardware faster here than almost anywhere in the country.

On a service upgrade we install a new electrode system rather than tying new equipment to old corroded hardware. That means rods driven full depth with correct separation between them, listed clamps rated for direct burial, a grounding electrode conductor sized to the new service, and connections that an inspector can actually see and verify.

Bonding is the other half and it is the half that gets skipped. The metallic water piping and the metallic gas piping both have to be tied into the bonding system. Communications equipment needs a place to land, which is why an intersystem bonding termination is required at the service. If the old subpanels in the house have neutrals and grounds landed on the same bar because they were fed with three wires, that gets corrected when we rework the service. These are not paperwork items. Bonding is what keeps a fault current path low impedance so a breaker trips instead of energizing something you can touch.

Condos and townhouses are a different job

In a condominium, the "service" for your unit is usually a feeder from a meter stack in a common electrical room, and that room, the stack, and the building risers belong to the association, not to you. Upgrading a unit means upgrading your feeder and your unit panel, and that only works if the building has spare capacity on the riser feeding your stack.

The practical steps look different too. The association almost always requires an application, a description of the work, and approval before anything starts. Many buildings want a riser diagram showing the existing and proposed arrangement. Work in a common electrical room has to be scheduled with management because it can affect neighbors. Elevator reservations, floor protection, and permitted work hours are real constraints in the towers along the coast in Hallandale, Hollywood, Aventura, and Sunny Isles Beach.

Townhomes fall in between. Many have an individual meter and their own service entrance, which makes the work close to a single family upgrade, but the meter bank may be shared and the exterior wall may be governed by the HOA. We handle the association paperwork routinely, and we would rather spend an extra week on approvals than start work that gets stopped by a property manager on day one.

What we look at before quoting

An honest quote for a 200 amp service upgrade requires eyes on the house. Here is what we are evaluating:

• Whether the service is overhead or underground, and the condition of the mast, riser, and weatherhead.
• The meter can: rust, burned or heat damaged lugs, the manufacturer, and whether the utility wants it in the same location.
• The existing panel brand and condition, and whether it is in a location current code still allows, since panels in bathrooms and clothes closets have to move.
• The distance and path between the meter and the panel, and whether that run is exposed, in conduit, or buried in a wall.
• Wall construction. Concrete block and stucco means core drilling, anchoring into masonry, and stucco patching, which is a different labor picture than a frame wall.
• What is available for grounding electrodes and where they can be driven without hitting irrigation, plumbing, or a slab.
• The full load list, including anything you plan to add in the next few years so we size the panel for the house you are going to have.
• Condition of the branch circuits, since the panel is the one moment when the whole system is visible at once.

Several things move the scope: relocating the panel from inside to outside, converting from overhead to underground, a long meter-to-panel run, stucco and paint restoration, and any branch circuit repairs the panel work exposes. Our write-up on what drives panel upgrade cost goes deeper into the variables without pretending every house is the same.

Shortcuts that cost more later

We get called to fix these regularly:

• Reusing a corroded meter can because it "still works." Coastal meter sockets fail from the inside, and a heat damaged jaw shows up as flickering lights years later.
• No new grounding electrodes. The new panel gets tied to whatever was there. It passes a casual glance and fails to do its job during a surge.
• Undersized service conductors chosen from the wrong ampacity column. Dwelling service conductors have their own sizing rules, and using general-purpose values on a 200 amp service is a mistake we still find.
• Skipping the permit and having the meter reinstalled without an inspection release. This surfaces at closing or after a claim, and by then the original installer is gone.
• Leaving the old subpanels wrong. Bonded neutrals in downstream panels, missing four wire feeders to a detached garage or pool house, and no equipment grounding conductor in the feeder.
• No labeling. A directory that says "lights" and "plugs" is useless to the next electrician and to you during a storm.

Work that usually pairs with the upgrade

The day the service is open is the cheapest day to do several other things, because the equipment, the outage, and the permit are already in place.

The most common additions are a Level 2 EV charger circuit run while the panel is open, a generator interlock or transfer switch so the house is ready before storm season, whole home surge protection at the service and at sensitive equipment, dedicated circuits for a kitchen remodel, and correcting pool equipment bonding. If a standby unit is in your plans, doing the generator installation groundwork during the service upgrade avoids opening the same wall twice.

When to call

Call before you buy the EV, before the pool contractor sets the heater, and before the HVAC company installs a larger system. Those are the moments when a load calculation either saves you money or saves you from a surprise. Call sooner if your main breaker is tripping, if the meter can shows rust streaks or scorch marks, or if a home inspector flagged the service during a sale.

We handle 200 amp service upgrades across Broward County and the coastal Miami-Dade and Palm Beach County cities we serve, and we can tell you in one visit whether an upgrade is what your house actually needs. Reach us at (954) 602-0050 or send the details and a few photos of your meter and panel through our contact page, and we will start with the load calculation instead of a sales pitch.