Density Done Right: Electrical Sub-Panels and Meter Packs for Mt. Scott-Arleta ADUs and Multi-Plexes

Mt. Scott-Arleta is changing. As one of Southeast Portland’s most walkable and sought-after neighborhoods, it has become a hotspot for “middle housing” development. Whether it’s a modern detached ADU in a backyard near SE 72nd or the conversion of a classic lot into a triplex, increasing density is the new norm.

However, adding a second or third living unit to a property involves much more than just framing and plumbing. The “invisible” backbone of any successful multi-unit project is the electrical infrastructure. Understanding how to manage power distribution—specifically through sub-panels and meter packs—is essential for any homeowner or developer looking to build in SE Portland.

The Power Challenge of Multi-Unit Living

Most original homes in Mt. Scott-Arleta were built with a single 100-amp or 200-amp electrical service. When you add a fully functional ADU or split a home into a duplex, that existing service is rarely enough to power two or more kitchens, HVAC systems, and laundry sets simultaneously.

To do “density right,” you have to address two main technical hurdles: Capacity and Billing.

Key Solutions for Multi-Unit Electrical

1. The Sub-Panel: Branching Out

For a standard backyard ADU, a sub-panel is often the most efficient solution. Instead of running every single wire back to the main house, a high-capacity “feeder” line is run from the main service to a smaller breaker panel inside the ADU.

• The Benefit: It gives the ADU occupant easy access to their own breakers and allows for localized control of the unit’s power without interfering with the main residence.

2. Meter Packs: Simplifying the Split

If you are developing a duplex or a 4-plex, you likely want separate utility bills for each tenant. This is where meter packs (or multi-meter sockets) come in. A meter pack allows the utility provider (like PGE) to track energy usage for each unit individually.

• The Benefit: This eliminates the headache of trying to “guess” how to split a single power bill between multiple tenants and adds significant value to the property if you ever decide to sell.

3. Load Calculations and Feeders

Adding density requires a precise “Load Calculation” submitted to the city. This ensures that the total draw of all units combined doesn’t exceed what the local transformer on the street can provide. It also determines the size of the “service feeders”—the heavy-duty wires that bring power from the utility pole to your building.

Navigating Code and Compliance

In Portland, ADU and multi-family electrical work is strictly regulated. Code requirements cover everything from the trench depth of underground lines to the specific “clearances” required around outdoor meter banks. Getting these details wrong can lead to costly delays during the inspection phase or, worse, safety hazards for future tenants.

Power Your Project with Electric Avenue

Navigating the complexities of multi-unit electrical permits and installs doesn’t have to be a bottleneck for your project. At Electric Avenue, we specialize in the specific needs of Mt. Scott-Arleta’s growing density. From installing new meter packs and service feeders to the final “trim-out” of outlets and lighting in your new ADU, we ensure your project is safe, coded, and ready for occupancy.

Planning an ADU or multi-family conversion in SE Portland? Contact Electric Avenue today for a professional consultation and let us help you get the power right from day one.