Capacity addition vs. full upgrade in Ashburn
Ashburn's housing stock is newer than most of Northern Virginia — primary build-out 1990s through mid-2000s. Almost all came with 200-amp service from the original construction. That changes the panel-upgrade conversation:
- Adding a Tesla or ChargePoint? If your panel has spare capacity after the load calculation, no service upgrade may be needed. A Level 2 circuit and hookup is $1,200–$3,500 typical; $1,200–$4,500 is reserved for long, detached, outdoor, or otherwise complex routes, with EVSE hardware separate.
- Adding solar with inverter? We document busbar capacity, backfeed space, grounding, and the interconnection method. A required 200A panel upgrade stays within $3,500–$7,500; condition-specific extras are documented separately.
- Finished basement with new circuits? A load calculation determines whether new circuits fit the existing service or whether a subpanel or service change belongs in the written scope.
- Two-EV household or anticipating multiple EVs? Load management or 400A service may be appropriate after the load calculation. Any 400A service is quoted per project.
- 1980s home with original 150A panel? Standard 200A upgrade. $3,500–$7,500.
Every Ashburn assessment includes an NEC 220 load calculation of your actual usage profile so the recommendation is data-driven, not generic.
Loudoun County permitting
Ashburn is in Loudoun County, a separate permitting authority from Fairfax County or Arlington. AJ Long Electric files required electrical permits through Loudoun County Building & Development under the company contractor license and coordinates the inspection. Timing depends on the county's current queue.
Many Ashburn homes built in the 1990s or later have underground service, while some older sections still have overhead service. We confirm the service configuration, permit path, equipment access, and any required Dominion coordination before setting the project schedule.
Frequently asked questions
Do newer Ashburn homes need panel upgrades?
Sometimes — Ashburn's mid-1990s through mid-2000s housing (One Loudoun, Brambleton early sections, Ashburn Village) was usually built with 200A service, which IS adequate for normal household use but often insufficient for modern EV-charger + heat-pump + home-office load profiles. The most common Ashburn panel work is capacity additions (sub-panels) rather than full replacements. For 1990s-era homes with original 150A service, full 200A or 400A upgrades are increasingly common as EV adoption grows.
What does a panel upgrade cost in Ashburn?
A standard 200A upgrade follows the Northern Virginia public range of $3,500–$7,500. Sub-panel additions and unusual site conditions are quoted to the defined scope. Ashburn's larger lots and longer service drops can push pricing toward the upper end of the range.
What about Loudoun County permits?
Ashburn is in Loudoun County (not Fairfax County), so panel upgrades go through Loudoun County Building & Development permitting — a different process from Fairfax County. We're licensed and file the required permit. Review and inspection timing depends on the county's current queue and the documented scope.
I'm adding a Tesla. Do I need a panel upgrade?
Depends on your existing service. If you have a 200A panel with at least 30 amps of spare capacity (NEC calculation), we can add a 40A or 50A circuit for the EV charger without upgrading the panel. If you have 150A or your panel is already running close to capacity, we'd recommend upgrading to 200A (sometimes 400A if you anticipate multiple EVs). The in-home assessment includes a load calc that gives you the firm answer.
Do new construction Ashburn homes have Federal Pacific or Zinsco panels?
No — both Federal Pacific Stab-Lok and Zinsco were discontinued before Ashburn's primary build-out (1990s+). However, some 1980s homes in the older parts of Ashburn (eastern Ashburn near Belmont Country Club) do have FPE panels. If you have one, see our FPE replacement page for the brand-specific safety concerns.
Will Dominion Energy need to disconnect?
Many Ashburn homes built in the 1990s or later have underground service, while some older homes still have overhead service. The project schedule is set after we confirm the service configuration, equipment access, permit path, and any required Dominion coordination.
Why AJ Long for Ashburn panel work
Loudoun County panel-upgrade and capacity-addition work is an active service area as Ashburn's EV adoption keeps climbing. We begin with an NEC 220 load calculation, document the scope, pull the required permit, and coordinate the inspection process. See our current reviews and written warranty terms when comparing options.
Call (571) 444-6886 or schedule online.
Adding EV charging and not sure if your panel can handle it?
NEC load calc included in every assessment. If your panel has capacity, we just add the EV circuit. If not, we recommend the right level of upgrade with honest pricing.
Authoritative Sources
- NFPA 70: National Electrical Code (NEC)The NEC is the foundational safety standard for electrical wiring and installation in the U.S.
- Electrical Safety Foundation International (ESFI)Nonprofit dedicated to promoting electrical safety in the home and workplace.
- Fairfax County: Electrical PermitsLocal permitting requirements for electrical work in Fairfax County, VA.