Adding a room, a primary suite, or an in-law apartment to your Anne Arundel County home means more than running a few new outlets — it means proving to a county inspector that your existing panel can actually carry the new load. David Williams Electric has wired additions across the county for 30-plus years, from waterfront bump-outs off the Magothy in Pasadena to in-law suites going up near Fort Meade in Odenton. You get the load calc, the permit, and the finished circuits done right, with the price agreed up front.
Your panel decides what your addition can hold
Before we pull a single cable, we run a service load calculation. A lot of the older homes on the Magothy and Severn River peninsulas — the 1950s Cape Cods and ramblers around Pasadena, Arnold, and the Annapolis Neck — are still on 100-amp or split-bus panels that were never sized for a second living space. Bolt a bedroom-and-bath addition onto that, plus the mini-split or baseboard heat that comes with it, and you can push the existing service past what it’s rated for.
The load calc tells us the honest answer: whether your current panel has room for the new branch circuits, whether we add a subpanel out in the addition, or whether the service itself needs an upgrade to 200 amps first. We’d rather tell you that on day one — in writing, with the price attached — than have you find out when the inspector red-tags the job.
New circuits sized to how the room will actually be used
An addition is rarely just “a room.” A primary suite needs its own 20-amp bathroom circuit, a dedicated line for the mini-split, and enough general lighting and receptacle circuits to meet code spacing — no outlet more than six feet from a corner. A bonus room over the garage in a Crofton or Piney Orchard colonial might need a hardwired smoke/CO detector tied into the rest of the house. A waterfront sunroom addition in Severna Park almost always means exterior GFCI receptacles and weatherproof fixtures rated for the humidity coming off the water.
We wire each addition for what it’s going to be, not a generic template: AFCI/GFCI protection where the code now requires it, properly grounded circuits, and home runs back to the panel that won’t trip every time you run a space heater and a hair dryer at once.
If we find aluminum branch wiring, we fix it the right way
Plenty of Anne Arundel homes built in the late 1960s and early 1970s — common through Glen Burnie, Pasadena, and parts of Severna Park — have aluminum branch-circuit wiring. When we tie a new addition into existing aluminum circuits, we don’t just twist the dissimilar metals together and hope. We repair those connections with pig-tailing using listed ALUMICONN connectors, which is the safe, code-recognized way to join aluminum to the copper feeding your new room. It’s the kind of detail that doesn’t show up in the drywall but is exactly what keeps the connection from overheating years down the road.
We pull the county permit and stand behind the inspection
Electrical work on an addition in Anne Arundel County goes through the Department of Inspections and Permits in Annapolis, and the county is its own inspecting authority — BGE is just the utility on the meter side. We handle the permit, schedule the rough-in and final inspections, and meet the inspector on site so you’re not the one fielding questions about box fill and conductor sizing.
Maryland license #11734, 30-plus years in the trade, up-front pricing, and a 100% satisfaction guarantee. The permit closing out clean is the goal — your addition isn’t really finished until the county signs off and your insurance has a record of legal, inspected work.
Frequently Asked Questions
Will my existing panel handle a home addition, or do I need a service upgrade?
That's exactly what the load calculation answers. Many older Anne Arundel homes — especially the mid-century houses around Pasadena, Arnold, and Annapolis — are on 100-amp or split-bus panels with no room to spare. We measure your existing demand, add the new addition's load, and tell you up front whether we can add circuits to the current panel, install a subpanel, or need to upgrade to a 200-amp service first.
Do I need a permit to wire an addition in Anne Arundel County?
Yes. Electrical work on an addition requires a permit through the county's Department of Inspections and Permits in Annapolis, with a rough-in inspection before the walls close and a final inspection at the end. We pull the permit and handle both inspections — it's included in how we run the job, not an extra you chase down yourself.
My house has aluminum wiring. Can you still tie in a new addition?
Absolutely, and we do it the correct way. Where new copper circuits meet existing aluminum branch wiring — common in Glen Burnie and Pasadena homes from the early 1970s — we pig-tail the connections using listed ALUMICONN connectors. That's the safe, code-recognized repair for joining aluminum to copper, not a shortcut that overheats later.
How much will wiring my addition cost?
You get a clear, written price before the work starts — that's the up-front pricing we're known for. The cost depends on the size of the addition, how many circuits it needs, and whether your panel has capacity or needs a subpanel or service upgrade. We sort all of that out during the load calc so there are no surprises mid-project.
Do you serve my town?
We cover Anne Arundel County top to bottom — Annapolis, Glen Burnie, Severna Park, Pasadena, Crofton, Arnold, and Odenton, plus the surrounding communities. If you're in the county and adding on, we can wire it.
Serving Anne Arundel County
David Williams Electric provides home addition wiring throughout Anne Arundel County, including Annapolis, Glen Burnie, Severna Park, Pasadena, Crofton, Arnold, Odenton. Explore all Anne Arundel County electrical services or learn more about home addition wiring across Maryland. Call (410) 781-4357 for a free, up-front quote.
