The electrical content that circulates among property owners in Los Angeles is almost entirely written for two audiences: single-family homeowners upgrading a 100-amp panel to 200 amps, and large commercial building operators managing campus-scale electrical infrastructure.

The owners of 8 to 20-unit multifamily buildings — the backbone of LA's rental housing market — are underserved by both conversations. Their electrical systems are too complex for single-family content to address meaningfully, and too small to warrant the institutional engineering resources that large commercial operators deploy. They exist in a middle territory where the problems are real, the stakes are high, and the guidance is scarce.

That middle territory is exactly where electrical upgrade projects go wrong.

An 8 to 20-unit apartment building in Los Angeles is not a scaled-up house. It is a genuinely complex electrical system — multiple meter banks, mixed service configurations, subpanel hierarchies, shared common area circuits, aging feeders, and a patchwork of additions and modifications accumulated over decades of ownership changes. Upgrading the electrical service on a building like this requires engineering judgment, not just panel swapping. And the consequences of getting it wrong — failed inspections, LADWP delays, tenant disruption, and liability exposure — are proportionally severe.

Here is what mid-size multifamily electrical upgrades actually involve, where they go wrong, and what engineering-led execution looks like when it's done right.

What "Mixed Meter Banks" Actually Means — and Why It Matters

A meter bank is the assembly of individual utility meters serving individual units, mounted in a common enclosure on the exterior of the building. In a typical multifamily building, each residential unit has its own meter — its own LADWP account, its own measured consumption, its own billing relationship with the utility.

In an 8 to 20-unit building, you typically have one or more meter banks serving the residential units, plus at least one additional meter serving common area loads — corridor lighting, laundry room circuits, exterior lighting, elevator service if present, and any shared HVAC equipment. Some buildings have a single meter bank. Many have two or three, particularly if the building has been expanded, renovated, or reconfigured at any point in its history.

The "mixed" designation refers to the condition where these meter banks are served by different configurations — different service entrance sizes, different feeder conductor sizes, different panel generations, and sometimes different voltage configurations serving different parts of the same building. This condition is extraordinarily common in LA's existing multifamily housing stock, where buildings constructed in the 1960s and 1970s have been partially upgraded, partially renovated, and partially left alone through successive ownership changes.

Mixed meter bank configurations create electrical upgrade complexity that has no analog in single-family work. The upgrade is not a single service entrance replacement. It is a system assessment — identifying how all of the service configurations interact, where the capacity constraints are, what the current load profile looks like across all meters, and what a coordinated upgrade needs to accomplish across the entire building.

The Service Capacity Problem in 8–20 Unit Buildings

Here is the electrical reality facing most mid-size multifamily buildings in Los Angeles right now.

When these buildings were constructed, the electrical load per unit was modest by current standards. Each unit had a 60-amp or 100-amp subpanel. The common area meter was sized for incandescent corridor lighting and a small laundry room. The total service entrance feeding the building was sized for that load profile — typically 200 to 400 amps for the entire building, across all meters.

The load profile of a 2025 multifamily unit looks nothing like that baseline. Heat pump water heaters — now required in new construction and increasingly mandated in renovation under California's building electrification mandates — draw 15 to 30 amps of continuous load per unit. EV charging in carport or garage spaces — increasingly a tenant demand and a regulatory requirement in renovations — draws 30 to 50 amps per Level 2 charger. Mini-split HVAC systems replacing window units draw sustained amperage that the original unit subpanels were never sized to handle.

Apply that load growth across 12 units in a building with a 400-amp total service entrance, and the arithmetic stops working. The building's electrical infrastructure was designed for a load that is now a fraction of what tenants are actually drawing — or demanding the right to draw.

The consequence isn't always a catastrophic failure. It is more often a chronic condition: breakers tripping under normal load, voltage drop complaints from tenants, overheated conductors in aging feeder conduits, and a building that cannot support any capital improvement — EV charging infrastructure, HVAC upgrades, laundry room modernization — without an electrical service upgrade that nobody has properly scoped.

Why the LADWP Coordination Is More Complex for Mid-Size Buildings

Single-family electrical service upgrades involve one LADWP meter, one service entrance, and one utility coordination process. The LADWP application is straightforward, the engineering review is routine, and the upgrade timeline — while still subject to LADWP's own queue — is predictable.

Mid-size multifamily buildings with mixed meter banks involve multiple LADWP accounts, multiple service connections, and a utility coordination process that requires LADWP's service engineering team to assess transformer capacity and service configuration for the entire building — not just a single meter.

This matters because LADWP's transformer infrastructure in many LA neighborhoods was sized for the historical load profile of the buildings it serves. A building that is upgrading from 400 amps total service to 800 amps total service — with new EV charging infrastructure adding significant peak demand — may require a transformer upgrade on LADWP's side of the meter. That transformer upgrade is LADWP's project, on LADWP's timeline, and it does not move at the pace of a building permit.

Transformer upgrade requests from LADWP can add months to an electrical service upgrade project — months that are invisible to owners and contractors who don't initiate the LADWP coordination process early enough. The building permit can be issued. The panel work can be complete. And the project sits, waiting for LADWP to energize a transformer that nobody thought to request until the permit was in hand.

SKS initiates LADWP coordination at project inception — not after permit issuance — specifically to identify transformer requirements and get them into LADWP's queue before they become the critical path item. This is institutional knowledge built from 39 years of electrical service work in Los Angeles. It is not in any permit manual. It is earned through projects that waited, and the process changes built to prevent waiting again.

The Feeder and Subpanel Hierarchy Problem

In a mid-size multifamily building, the electrical system is a hierarchy. The service entrance feeds a main distribution panel or panels. Those panels feed individual unit subpanels through feeder conductors running through the building's conduit system. The unit subpanels serve the branch circuits within each unit.

An electrical service upgrade that addresses only the top of this hierarchy — upgrading the service entrance and main distribution panel without assessing the feeder conductors and unit subpanels — is an incomplete upgrade. And incomplete upgrades create specific, predictable failure modes.

Feeder conductors in buildings constructed before 1980 are frequently undersized for the current load they carry — or for the increased load that the service entrance upgrade is designed to support. Aluminum wiring, which was used extensively in multifamily construction during the 1960s and 1970s, requires specific connection hardware and periodic inspection to remain safe at the connections. Feeder conduit runs that have been penetrated, damaged, or improperly modified during decades of building renovation may not support the new conductor sizes required by the upgraded service.

Unit subpanels in older buildings are frequently the original builder-grade equipment — Federal Pacific Stab-Lok or Zinsco panels, both of which have documented failure modes and are flagged by insurers and inspectors. A service entrance upgrade that feeds current through a Stab-Lok subpanel in Unit 7 has not made the electrical system safer. It has increased the load on a documented fire hazard.

A proper electrical upgrade for a mid-size multifamily building requires a full system assessment — service entrance to unit subpanel — with engineering judgment applied to the feeder hierarchy. The upgrade scope is determined by what the building actually needs, not by what fits a contractor's standard scope template.

EV Charging Infrastructure: The Load Planning Problem Nobody Is Solving

Los Angeles is in the middle of a transportation electrification transition that is happening faster than most multifamily building owners have planned for. EV ownership in LA County is growing rapidly. Tenant demand for EV charging at their residence — and increasingly, state and local regulations requiring EV charging infrastructure in multifamily buildings — is creating an electrical demand scenario that most existing buildings simply cannot support without a coordinated infrastructure upgrade.

The electrical load implications of EV charging in a mid-size multifamily building are significant and non-trivial to manage. A building with 12 parking spaces, each served by a 40-amp Level 2 EV charger, is adding up to 480 amps of potential load to a building that may currently have 400 amps of total service entrance capacity. Even accounting for demand factor reductions — the statistical reality that not all chargers will be operating simultaneously at full load — the numbers require careful load analysis, not assumptions.

The right approach to EV charging infrastructure in a mid-size multifamily building is load-managed charging — a system where a central controller monitors total building electrical demand and allocates available charging capacity across active vehicles, preventing any single demand peak from exceeding the building's service capacity. This approach allows meaningful EV charging infrastructure to be deployed on a service entrance that is upgraded to a reasonable capacity, without requiring the massive service upgrade that worst-case simultaneous load scenarios would demand.

Designing a load-managed EV charging system for a mid-size multifamily building requires electrical engineering — not just a charging equipment vendor. The integration between the load management controller, the building's main distribution panel, the individual charger circuits, and LADWP's meter configuration has to be engineered as a system. It has to be permitted through LADBS with load calculations that satisfy plan check. And it has to be coordinated with LADWP to ensure the service entrance capacity supports the peak demand scenario under the load management algorithm.

This is not work that a residential electrical contractor can execute from a truck. It is work that requires an in-house engineer who understands the full system from utility service through branch circuit.

Common Area Electrical: The Circuit That Gets Ignored Until It Fails

Every mid-size multifamily building has a common area electrical meter. In most buildings, it is the circuit that receives the least attention and the most deferred maintenance.

Common area circuits in older buildings frequently include corridor lighting on original wiring from the 1960s, laundry room circuits that have been extended and modified without permits, exterior lighting on circuits that have been spliced, taped, and forgotten, and in some cases, shared mechanical equipment — boilers, circulating pumps, gate operators — that was added without coordination with the original electrical design.

When a mid-size multifamily building undergoes an electrical service upgrade, the common area electrical system cannot be treated as an afterthought. The common area meter is part of the total service calculation. Common area wiring deficiencies are the conditions most likely to generate LADBS inspection corrections — because the inspector will walk the building, and the corridor wiring is the wiring they see.

More importantly: common area electrical deficiencies are the deficiencies most likely to affect all tenants simultaneously. A failing feeder to the laundry room, a corridor lighting circuit that trips at 2 AM, a gate operator that loses power in a fault condition — these are building management problems, liability problems, and tenant retention problems all at once.

A comprehensive mid-size multifamily electrical upgrade scopes the common area system alongside the unit service — not as a separate project to be handled later, but as an integrated assessment of the building's complete electrical infrastructure.

What a Properly Scoped Mid-Size Multifamily Electrical Upgrade Includes

Based on 39 years of electrical service work in Los Angeles, here is what a properly scoped upgrade for an 8 to 20-unit multifamily building actually encompasses:

Full load analysis — Existing load profile across all meters, projected load under planned improvements including EV charging and HVAC upgrades, and service entrance sizing that provides adequate capacity with headroom for future growth.

LADWP pre-coordination — Transformer capacity verification and service application initiated concurrently with LADBS plan check, not sequentially after permit issuance.

Service entrance upgrade — Main service entrance replacement sized to the load analysis, with meter bank reconfiguration where the existing mixed configuration creates safety or capacity issues.

Feeder assessment and upgrade — Evaluation of existing feeder conductors from main distribution panels to unit subpanels, with replacement or upsizing where conductors are undersized, aluminum wiring presents connection risks, or conduit condition is compromised.

Unit subpanel assessment — Identification of Federal Pacific, Zinsco, or other flagged panel equipment in individual units, with replacement recommended where documented failure modes are present.

Common area circuit documentation and upgrade — As-built documentation of common area circuits, identification of unpermitted modifications, and upgrade of deficient wiring to current code.

EV charging infrastructure design — Load-managed charging system design integrated with the service entrance upgrade, engineered for LADBS permit submission and LADWP coordination.

LADBS permit and inspection management — Complete permit package preparation, plan check coordination, correction response, and inspection scheduling through final sign-off.

This is one project. One contract. One engineer of record from assessment through city sign-off.

SKS and Mid-Size Multifamily Electrical: Engineering Where It's Actually Needed

SKS Construction has been delivering electrical service upgrades for multifamily properties across Los Angeles since 1987. Our in-house licensed structural and electrical engineers assess mid-size multifamily buildings as complete systems — not as collections of individual panel swaps. We understand the LADWP coordination requirements, the feeder hierarchy implications, the EV charging load management engineering, and the common area circuit documentation that mid-size multifamily electrical upgrades demand.

We handle LADWP applications, LADBS permits, direct panel supply, and construction under one fixed-price contract. No subcontracted electricians working from a handoff. No permit expediters managing a process they didn't design. No change orders when the feeder conditions turn out to be what a proper assessment would have identified at the beginning.

Thirty-nine years. Over 3,000 completed projects. 80% repeat clients. Direct owner access to Shahab and Sam Shaolian. One firm that has been closing electrical permits on mid-size multifamily buildings in this city long enough to have upgraded buildings that were new when we started.

Get a FREE Electrical System Assessment for Your Multifamily Property

SKS Construction offers FREE electrical service assessments for multifamily property owners with 8 to 20-unit buildings across Los Angeles County. Our in-house engineer will evaluate your existing service configuration, meter bank layout, feeder hierarchy, and load profile — and provide a fixed-price upgrade proposal that addresses the complete system, not just the panel at the top of it.

If you're planning EV charging infrastructure, HVAC upgrades, an ADU addition, or a capital improvement program that requires electrical capacity you don't currently have — start here.

Call (818) 855-1181 or email info@sksconstruction.com to schedule your FREE electrical assessment today.

Mid-size multifamily electrical isn't single-family work at scale. It's a different discipline — and we've been engineering it for 39 years.