Your electrical panel is the single point every circuit in your home or building runs through, and when it runs out of capacity, every other upgrade stalls. This guide covers how to know when you've outgrown your existing service, how a real load calculation decides between a 200A and 400A panel, and what actually drives electrical panel replacement cost in Los Angeles. You'll also learn where subpanels and Span smart panels fit, and how permits and utility coordination shape the timeline. If you're planning an EV charger, a standby generator, or a whole-home automation system, read this before you plan anything else.

What You'll Find in This Guide

Electrical Service Upgrades in Los Angeles, CA

If this is the work you are planning, start with Electrical Service Upgrades.

Signs You've Outgrown Your Electrical Panel

Most Los Angeles homes built before the 1990s carry 100A or 125A service. That capacity made sense for a house with a gas range, a gas dryer, and no electronics beyond a television. However, it rarely survives contact with a modern renovation. Induction cooktops, heat pump HVAC, Level 2 EV charging, and whole-home automation all add continuous load that the original panel never anticipated.

Some warning signs show up before you add anything new. Breakers that trip when two large appliances run at once point to circuits near their limit. Lights that dim when the HVAC compressor starts suggest voltage drop under load. A panel with every slot filled, or with tandem breakers doubled into single slots, has no room for the circuits a renovation will demand. Additionally, certain legacy panel brands have documented failure histories, and many insurers flag them during underwriting. If your panel carries one of those labels, replacement belongs in your renovation scope regardless of capacity.

The stakes go beyond inconvenience. According to NFPA, U.S. fire departments responded to an average of 46,652 home electrical fires per year during 2020 to 2024, killing 527 people and causing $2.4 billion in damage annually. Beyond that, the National Fire Protection Association reports that electrical distribution or lighting equipment is the leading cause of home fire property damage, at an estimated $1.6 billion in direct property damage each year. An overloaded or deteriorated panel sits squarely in that category.

The Loads That Push a Home Past Its Panel Capacity

Here is where the math gets specific. A Level 2 EV charger running at 48 amps counts as a continuous load, so code sizes its circuit at 60 amps. A standby generator needs a transfer switch integrated at the service, which affects panel layout and sometimes service size. Meanwhile, an automation system with a dedicated equipment rack, motorized shades on every window, and a media room adds dozens of circuits, even if each one is small. Stack an EV charger, an induction range, and a heat pump onto a 100A service and the load calculation fails before you finish the list.

This means the question is rarely "is my panel old." The real question is whether your service, your panel, and your circuit layout can carry the home you're building, not the home that was wired in 1972. Answering that takes a load calculation, which is where the next section begins.

200A vs 400A: Sizing the Service With a Real Load Calculation

A panel upgrade done correctly starts on paper, not with a sawzall at the meter. The National Electrical Code, specifically Article 220, defines how to calculate a building's demand load. The calculation totals general lighting loads by square footage, adds fixed appliances, applies demand factors that recognize not everything runs at once, and then adds continuous loads like EV charging at 125 percent. Additionally, the result tells you what service size the building actually needs. Guessing, or defaulting to "200A is standard," skips the only step that matters.

For most renovated single-family homes, 200A service covers the load with headroom. That said, the calculus changes fast at the high end. A large custom home with two or three EV chargers, electric pool equipment, a heat pump array, a sauna, and a full automation and AV package can push a calculated load past what 200A supports. In that case, 400A service, typically delivered as two 200A panels fed from a single meter, becomes the right answer. For a deeper comparison, the deciding factors are calculated demand, future loads you can name today, and the utility's available service at your address.

Commercial spaces follow the same logic with different numbers. A build-out with commercial kitchen equipment, dedicated HVAC, and significant lighting and AV loads needs its own calculation, and three-phase service often enters the conversation.

Subpanels and Smart Panel Options and Their Costs

Not every capacity problem needs a bigger service. For example, a detached garage, an ADU, or a home theater equipment rack often calls for a subpanel: a satellite panel fed from the main that puts breakers near the loads they serve. Subpanels shorten wire runs, simplify troubleshooting, and keep the main panel organized. However, a subpanel adds distribution, not capacity. If the main service is already at its calculated limit, a subpanel alone solves nothing.

Smart panels change the equation differently. A Span panel replaces the breaker enclosure with a monitored, software-controlled panel that measures every circuit in real time and can shed loads automatically. In practice, that load management can let a home run an EV charger and a large HVAC system on 200A service where a static calculation would demand 400A. For homes pairing solar, battery storage, or a generator with heavy loads, that flexibility is the entire point. We design Span installations alongside Control4, Josh AI, and Lutron systems, so circuit-level monitoring ties into the same control layer as the rest of the home.

What Drives Electrical Panel Replacement Cost in Los Angeles

Nobody can quote a panel upgrade accurately from a phone call, because the cost of electrical panel replacement depends on conditions at your specific service. Instead of chasing a single number, it helps to understand the variables that move the scope up or down. With this in mind, here are the factors that matter most.

Service size is the first driver. Moving from 100A to 200A usually means a new panel, new service entrance conductors, and often a new meter base. Stepping up to 400A adds a second panel, larger conductors, and heavier utility coordination. Second, the condition of what's already there matters. Grounding and bonding on older homes rarely meet current code, so a panel replacement typically includes new ground rods, bonding to water and gas lines, and sometimes a grounding electrode conductor upgrade. Additionally, the physical mounting situation plays a role: a panel buried in stucco, located in a closet that no longer meets clearance rules, or needing relocation entirely changes the labor picture.

Equipment choices shift scope as well. A standard load center, a generator-ready panel with an integrated transfer switch, and a Span smart panel are three different installations with three different material and programming requirements. Finally, utility-side work matters. If the overhead drop or underground lateral needs upgrading, LADWP or Southern California Edison gets involved, and their scheduling becomes part of your timeline.

Permits, Inspections, and the Real Timeline

Every panel upgrade in the City of Los Angeles requires a permit and inspection through the Los Angeles Department of Building and Safety. Surrounding cities run their own building departments with similar requirements. As a result, the permit is not optional paperwork. An unpermitted panel can stall a home sale, void an insurance claim, and force rework during a later remodel.

Timeline questions come up constantly. The physical work of a like-for-like 200A panel replacement typically takes a day, with power off for most of it. However, the full project runs longer. Load calculation and design come first, then permitting, then utility scheduling for the disconnect and reconnect, then inspection. A 400A upgrade with utility service changes stretches further because the utility controls part of the schedule. For planning purposes, treat the cost and timeline of electrical panel replacement as outputs of the same design process: the clearer the load calculation and scope, the fewer surprises on either front. Within a larger renovation or new build, the panel work sequences alongside rough framing and the rest of the electrical rough-in, so early coordination with your architect and GC keeps it off the critical path.

How Panel Capacity Shapes Everything Else in the Project

A panel upgrade is the foundation for every other system in a renovation or new build. Sizing it in isolation creates problems that surface months later.

Consider EV charging. A Tesla Wall Connector or other Level 2 charger needs a dedicated high-amperage circuit, and a second charger doubles that demand. If the panel was sized before EVs were planned, you either accept slow charging rates or reopen the service upgrade conversation mid-project. The same applies to standby power. A Generac whole-house generator ties into the service through an automatic transfer switch, and the panel layout determines whether it backs up the entire home or only selected circuits. Deciding this after the panel is set requires rework.

Automation and AV loads follow the same pattern. A Control4 or Josh AI system, Lutron lighting and shading, and a dedicated theater don't draw massive power individually but demand circuit count, clean dedicated circuits for equipment racks, and thoughtful panel organization so a tripped breaker never takes down the network closet. A well-planned panel schedule separates AV, automation, lighting, mechanical, and convenience circuits into logical groups, often across a main panel and subpanels.

This is why the integrator and electrician should be the same firm or sit at the same table during design. When the person running the load calculation knows the rack layout, shade motor count, and generator transfer scheme, the panel gets sized once and sized right. Capacity planning is a design decision, not a line item. The electrical panel replacement cost conversation gets much shorter when the scope reflects every load the home will carry, named and calculated, before anyone pulls a permit.

Ready to Get Started?

We design and install 200A and 400A service upgrades, subpanels, and Span smart panels for high-end homes and commercial spaces across Los Angeles, as part of new construction, full renovations, and estate upgrades that often include Generac standby power, EV charging, and Control4, Josh AI, or Lutron systems. Our team holds CSLB C-10 #1048529 and works directly with homeowners, architects, GCs, and design teams. Call or send a request Monday through Friday, 8:00 to 16:00, and tell us about your project.