A lot of Montgomery County garages were wired for a single bulb and a door opener, not a car that drinks 40 amps overnight. David Williams Electric installs Level 2 home chargers from Rockville and Bethesda out to Germantown and Olney — pulling a proper 240V circuit, checking whether your panel can actually carry the load, and pulling the Montgomery County permit so the install passes inspection the first time. Maryland licensed (#11734), 30-plus years on the tools, with the price written down before any wire gets run.
What a real Level 2 install looks like here
A Level 2 charger isn’t a plug-and-play job — it’s a dedicated 240-volt circuit run from your panel to wherever the car parks, sized to the charger’s amperage and protected at its own breaker. On a typical install we set the unit (hardwired or on a NEMA 14-50 outlet), run the cable cleanly along the garage wall or down from a panel in the basement, and torque every connection to spec so nothing loosens up over a Maryland winter.
Where the car parks decides a lot. A Bethesda detached garage set back from the house is a different cable run than a Gaithersburg townhome with the panel in a first-floor closet, or a Potomac home where the EV lives in a side-load garage 30 feet from the service. We walk the route before quoting so the number you get accounts for your house, not a generic average.
Will your panel take the load? We check before we promise
This is the question that actually matters in Montgomery County, and it’s the one a lot of quotes skip. A 7.7 kW charger pulls 40 amps continuous. Plenty of homes inside the Beltway — the brick colonials and split-levels around Silver Spring, Chevy Chase, and older Rockville — still run a 100- or 150-amp service that’s already busy with a heat pump, an electric range, and maybe a finished basement added decades ago.
We run a load calculation instead of guessing. Sometimes there’s clear headroom and we just add a breaker. Sometimes a 100-amp panel needs a 200-amp upgrade first, or a load-management device that throttles the charger when the dryer kicks on so you don’t have to upsize the whole service. Either way you hear the honest answer up front — not a surprise on installation day.
Permits, inspection, and Pepco — handled
An EV circuit in Montgomery County needs an electrical permit through the Department of Permitting Services and an inspection to close it out. We pull that permit under our Maryland master license (#11734), do the work to code, and meet the inspector so you’re not chasing paperwork. If a panel upgrade means Pepco has to be involved, we coordinate that too.
Skipping the permit is a false savings — it can snag a future home sale and voids the protection that inspection gives you. We do it the right way, and the up-front price includes the permit so there’s no line item that appears later.
Older homes and aluminum branch wiring
If your house went up in Montgomery County in the late 1960s or early 1970s — a chunk of Wheaton, Aspen Hill, and parts of Rockville and Gaithersburg fit this — there’s a real chance of aluminum branch-circuit wiring. That doesn’t stop an EV charger install, but it changes how we make connections at the panel and at any junction in the run.
Where we tie into aluminum, we don’t just twist and cap it. We pig-tail to copper using AlumiConn connectors rated for the job, so the connection stays tight and cool for the long haul. It’s a small detail that separates a clean inspection and a charger that runs for years from a warm-terminal problem down the road.
Frequently Asked Questions
How much does a home EV charger install cost in Montgomery County?
For a straightforward Level 2 install — a short circuit run to a panel with room to spare — most jobs land in a predictable range, and you get that number in writing before we start. The variables that move it are run distance, whether we hardwire or set a 14-50 outlet, and whether your panel needs a breaker added versus a full upgrade. We quote your actual house, county permit included, with no surprise add-ons.
Do I need a permit to install an EV charger in Montgomery County?
Yes. A dedicated 240V EV circuit requires an electrical permit through the Montgomery County Department of Permitting Services and a final inspection. We pull the permit under Maryland license #11734 and meet the inspector ourselves, so it's closed out properly — important if you ever sell the home.
My Bethesda house has a 100-amp panel. Can it handle a charger?
Sometimes yes, sometimes it needs help. A 40-amp charger is a big continuous load, and many older inside-the-Beltway homes are already near capacity with heat pumps and electric appliances. We run a load calculation first. If there's no room, the fix is usually a 200-amp upgrade or a load-management device that lets the charger share the service safely — and we tell you which one before any work begins.
How long does the installation take?
Most single-charger installs are a one-day job once the permit is in hand. If your panel needs upgrading first, that adds time and a coordination step with Pepco, which we schedule with you. We don't leave a job half-finished overnight.
Can you install a charger if my home has aluminum wiring?
Yes. Homes from the late-'60s and early-'70s around Wheaton, Aspen Hill, and parts of Gaithersburg often have aluminum branch wiring. Where we connect to it, we pig-tail to copper with AlumiConn connectors rated for aluminum-to-copper, so the connection stays safe and tight. It's done to code and passes inspection.
Serving Montgomery County
David Williams Electric provides ev charger installations throughout Montgomery County, including Rockville, Bethesda, Silver Spring, Gaithersburg, Germantown, Potomac, Olney. Explore all Montgomery County electrical services or learn more about ev charger installations across Maryland. Call (410) 781-4357 for a free, up-front quote.
