Rowhome service upgrades in Baltimore City.

Baltimore City has the highest share of pre-war homes in Maryland, and many of them are attached rowhomes. That age shows up behind the walls. If you're adding central air, a heat pump, an electric range or an EV charger, or your home inspector flagged the panel, a panel replacement or service upgrade is often the first step. This guide covers what's different about doing that work in a city rowhome.

How old Baltimore's housing is

A Stacker analysis of U.S. Census Bureau 2023 five-year estimates ranks Baltimore City first in Maryland for pre-war housing: about 41% of homes, roughly 120,800 of them, were built in 1939 or earlier. Houses that old were wired for a handful of lights and outlets. Many have been rewired or upgraded since, some more than once, and some still carry pieces of every era.

What we often find in older rowhomes

• Small service. Service sized for a house with far fewer appliances than you have now.
• Older panels or fuse boxes. Including brands home inspectors flag, like Federal Pacific Stab-Lok and Zinsco.
• Mixed wiring. Circuits from several decades, sometimes including older wiring methods that need a closer look. Our rewiring and older homes page covers that work.
• Tight equipment spaces. Panels and meters in narrow basements, under stairs or in spots that don't leave the working clearance the code requires today.

None of this is unusual, and none of it is a reason to put off the upgrade. It's a reason to plan it.

What's different about a rowhome upgrade

Where the equipment can go

A detached house usually has room to move the meter or panel if needed. A rowhome has a front, a back and two shared walls. Where the service comes in, where the meter sits and where the new panel can go with proper clearance all get decided early, because they drive most of the cost.

The outdoor emergency disconnect

The 2020 National Electrical Code, which Baltimore City enforces, requires an emergency disconnect in a readily accessible outdoor location for one- and two-family dwellings when service equipment is replaced or installed. With no side yard, where that goes takes some planning.

Surge protection

The 2020 NEC also requires a surge-protective device when dwelling service equipment is replaced or installed, so it's part of the scope.

The circuits that move over

Every circuit lands in the new panel. In an older house, some of those circuits may need repair to pass inspection. We tell you what we find before we start, not halfway through.

BGE

BGE owns the meter and the service to the house, and has to disconnect and reconnect it for the swap. We coordinate that so you aren't stuck in the middle.

Permits and code in Baltimore City

Electrical permits in the city are filed online through ePermits, run by the Department of Housing and Community Development, and the contractor must be registered in the ePermits database. The city enforces the 2020 NEC with its own amendments, adopted in Part III of its Building, Fire and Related Codes. That's a different edition from Harford County and Baltimore County, which both enforce the 2023 NEC. See which electrical code applies in Maryland and our guide to electrical permits in Harford and Baltimore.

Do you need 200 amps?

Maybe not. The load calculation decides. A rowhome with gas heat and a gas range may be fine on its existing service with a new panel. One that's going all-electric, or adding an EV charger, often isn't. Our 100-to-200-amp upgrade guide walks through how that's decided.

Questions to ask any electrician

Whoever you hire for a rowhome service upgrade, these questions sort out the ones who've thought it through:

• Are you registered in Baltimore City's ePermits system, and will you pull the permit yourself?
• Did you run a load calculation, and can I see the result?
• Where will the new panel, meter and outdoor emergency disconnect go, and why there?
• What happens if you find circuits that won't pass inspection once the old panel is out?
• Who coordinates the disconnect and reconnect with BGE?

Clear answers before the job starts are the best predictor of a job that passes inspection the first time.

Before you book

• Take a photo of the panel with the door open (don't remove the inner cover) and of the meter.
• Make a list of what you're planning to add: central air, heat pump, range, dryer, EV charger.
• If you have a recent home inspection report, have the electrical section handy.

Wyatt Electric works in Baltimore City as well as Harford and Baltimore County, and has since 1986. We pull the city permit, coordinate with BGE, and stay with the job through inspection.